diff --git a/Documentation/admin-guide/devices.txt b/Documentation/admin-guide/devices.txt
index 63fd4e6a014b..dc9a30b5f1a2 100644
--- a/Documentation/admin-guide/devices.txt
+++ b/Documentation/admin-guide/devices.txt
@@ -376,8 +376,9 @@
 		240 = /dev/userio	Serio driver testing device
 		241 = /dev/vhost-vsock	Host kernel driver for virtio vsock
 		242 = /dev/rfkill	Turning off radio transmissions (rfkill)
+		243 = /dev/winesync	Wine synchronization primitive device
 
-		243-254			Reserved for local use
+		244-254			Reserved for local use
 		255			Reserved for MISC_DYNAMIC_MINOR
 
   11 char	Raw keyboard device	(Linux/SPARC only)
diff --git a/Documentation/userspace-api/index.rst b/Documentation/userspace-api/index.rst
index acd2cc2a538d..1950883c333e 100644
--- a/Documentation/userspace-api/index.rst
+++ b/Documentation/userspace-api/index.rst
@@ -24,6 +24,7 @@ place where this information is gathered.
    ioctl/index
    iommu
    media/index
+   winesync
 
 .. only::  subproject and html
 
diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst
index a4c75a28c839..e79d6b307e9b 100644
--- a/Documentation/userspace-api/ioctl/ioctl-number.rst
+++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
@@ -362,6 +362,8 @@ Code  Seq#    Include File                                           Comments
                                                                      <mailto:thomas@winischhofer.net>
 0xF6  all                                                            LTTng Linux Trace Toolkit Next Generation
                                                                      <mailto:mathieu.desnoyers@efficios.com>
+0xF7  00-0F  uapi/linux/winesync.h                                   Wine synchronization primitives
+                                                                     <mailto:wine-devel@winehq.org>
 0xFD  all    linux/dm-ioctl.h
 0xFE  all    linux/isst_if.h
 ====  =====  ======================================================= ================================================================
diff --git a/Documentation/userspace-api/winesync.rst b/Documentation/userspace-api/winesync.rst
new file mode 100644
index 000000000000..c980eab9f2ee
--- /dev/null
+++ b/Documentation/userspace-api/winesync.rst
@@ -0,0 +1,373 @@
+=====================================
+Wine synchronization primitive driver
+=====================================
+
+This page documents the user-space API for the winesync driver.
+
+winesync is a support driver for emulation of NT synchronization
+primitives by the Wine project. It exists because implementation in
+user-space, using existing tools, cannot satisfy performance,
+correctness, and security constraints. It is implemented entirely in
+software, and does not drive any hardware device.
+
+This interface is meant as a compatibility tool only and should not be
+used for general synchronization; instead use generic, versatile
+interfaces such as futex(2) and poll(2).
+
+Synchronization primitives
+==========================
+
+The winesync driver exposes two types of synchronization primitives,
+semaphores and mutexes.
+
+A semaphore holds a single volatile 32-bit counter, and a static
+32-bit integer denoting the maximum value. It is considered signaled
+when the counter is nonzero. The counter is decremented by one when a
+wait is satisfied. Both the initial and maximum count are established
+when the semaphore is created.
+
+A mutex holds a volatile 32-bit recursion count, and a volatile 32-bit
+identifier denoting its owner. The latter is intended to identify the
+thread holding the mutex; however, it is not actually validated
+against earlier calls made by the same thread. A mutex is considered
+signaled when its owner is zero (indicating that it is not owned). The
+recursion count is incremented when a wait is satisfied, and ownership
+is set to the given identifier. A mutex also holds an internal flag
+denoting whether its previous owner has died; such a mutex is said to
+be inconsistent. Owner death is not tracked automatically based on
+thread death, but rather must be communicated using
+``WINESYNC_IOC_KILL_OWNER``.
+
+Objects are represented by unsigned 32-bit integers. An object
+identifier will always be less than or equal to the value of INT_MAX.
+
+Char device
+===========
+
+The winesync driver creates a single char device /dev/winesync. Each
+file description opened on the device represents a unique namespace.
+That is, objects created on one open file description are shared
+across all its individual descriptors, but are not shared with other
+open() calls on the same device.
+
+ioctl reference
+===============
+
+All operations on the device are done through ioctls. There are three
+structures used in ioctl calls::
+
+   struct winesync_sem_args {
+   	__u32 sem;
+   	__u32 count;
+   	__u32 max;
+   	__u32 flags;
+   };
+
+   struct winesync_mutex_args {
+   	__u32 mutex;
+   	__u32 owner;
+   	__u32 count;
+   };
+
+   struct winesync_wait_args {
+   	__u64 timeout;
+   	__u64 objs;
+   	__u32 count;
+   	__u32 owner;
+   	__u32 index;
+   	__u32 pad;
+   };
+
+Depending on the ioctl, members of the structure may be used as input,
+output, or not at all.
+
+All ioctls return 0 on success, and -1 on error, in which case `errno`
+will be set to a nonzero error code.
+
+The ioctls are as follows:
+
+.. c:macro:: WINESYNC_IOC_CREATE_SEM
+
+  Create a semaphore object. Takes a pointer to struct
+  :c:type:`winesync_sem_args`, which is used as follows:
+
+    ``count`` and ``max`` are input-only arguments, denoting the
+    initial and maximum count of the semaphore.
+
+    ``flags`` is an input-only argument, which specifies additional
+    flags modifying the behaviour of the semaphore. There is only one
+    flag defined, ``WINESYNC_SEM_GETONWAIT``. If present, wait
+    operations on this semaphore will acquire it, decrementing its
+    count by one; otherwise, wait operations will not affect the
+    semaphore's state.
+
+    ``sem`` is an output-only argument, which will be filled with the
+    allocated identifier if successful.
+
+  Fails with ``EINVAL`` if ``count`` is greater than ``max``, or
+  ``ENOMEM`` if not enough memory is available.
+
+.. c:macro:: WINESYNC_IOC_CREATE_MUTEX
+
+  Create a mutex object. Takes a pointer to struct
+  :c:type:`winesync_mutex_args`, which is used as follows:
+
+    ``owner`` is an input-only argument denoting the initial owner of
+    the mutex.
+
+    ``count`` is an input-only argument denoting the initial recursion
+    count of the mutex. If ``owner`` is nonzero and ``count`` is zero,
+    or if ``owner`` is zero and ``count`` is nonzero, the function
+    fails with ``EINVAL``.
+
+    ``mutex`` is an output-only argument, which will be filled with
+    the allocated identifier if successful.
+
+  Fails with ``ENOMEM`` if not enough memory is available.
+
+.. c:macro:: WINESYNC_IOC_DELETE
+
+  Delete an object of any type. Takes an input-only pointer to a
+  32-bit integer denoting the object to delete. Fails with ``EINVAL``
+  if the object is not valid. Further ioctls attempting to use the
+  object return ``EINVAL``, unless the object identifier is reused.
+  However, wait ioctls currently in progress are not interrupted, and
+  behave as if the object remains valid.
+
+.. c:macro:: WINESYNC_IOC_PUT_SEM
+
+  Post to a semaphore object. Takes a pointer to struct
+  :c:type:`winesync_sem_args`, which is used as follows:
+
+    ``sem`` is an input-only argument denoting the semaphore object.
+    If ``sem`` is not a valid semaphore object, the ioctl fails with
+    ``EINVAL``.
+
+    ``count`` contains on input the count to add to the semaphore, and
+    on output is filled with its previous count.
+
+    ``max`` and ``flags`` are not used.
+
+  The operation is atomic and totally ordered with respect to other
+  operations on the same semaphore. If adding ``count`` to the
+  semaphore's current count would raise the latter past the
+  semaphore's maximum count, the ioctl fails with ``EOVERFLOW`` and
+  the semaphore is not affected. If raising the semaphore's count
+  causes it to become signaled, eligible threads waiting on this
+  semaphore will be woken and the semaphore's count decremented
+  appropriately.
+
+.. c:macro:: WINESYNC_IOC_PULSE_SEM
+
+  This operation is identical to ``WINESYNC_IOC_PUT_SEM``, with one
+  notable exception: the semaphore is always left in an *unsignaled*
+  state, regardless of the initial count or the count added by the
+  ioctl. That is, the count after a pulse operation will always be
+  zero. The entire operation is atomic.
+
+  Hence, if the semaphore was created with the
+  ``WINESYNC_SEM_GETONWAIT`` flag set, and an unsignaled semaphore is
+  "pulsed" with a count of 2, at most two eligible threads (i.e.
+  threads not otherwise constrained due to ``WINESYNC_IOC_WAIT_ALL``)
+  will be woken up, and any others will remain sleeping. If less than
+  two eligible threads are waiting on the semaphore, all of them will
+  be woken up, and the semaphore's count will remain at zero. On the
+  other hand, if the semaphore was created without the
+  ``WINESYNC_SEM_GETONWAIT``, all eligible threads will be woken up,
+  making ``count`` effectively redundant. In either case, a
+  simultaneous ``WINESYNC_IOC_READ_SEM`` ioctl from another thread
+  will always report a count of zero.
+
+  If adding ``count`` to the semaphore's current count would raise the
+  latter past the semaphore's maximum count, the ioctl fails with
+  ``EOVERFLOW``. However, in this case the semaphore's count will
+  still be reset to zero.
+
+.. c:macro:: WINESYNC_IOC_GET_SEM
+
+  Attempt to acquire a semaphore object. Takes an input-only pointer
+  to a 32-bit integer denoting the semaphore to acquire.
+
+  This operation does not block. If the semaphore's count was zero, it
+  fails with ``EWOULDBLOCK``. Otherwise, the semaphore's count is
+  decremented by one. The behaviour of this operation is unaffected by
+  whether the semaphore was created with the
+  ``WINESYNC_SEM_GETONWAIT`` flag set.
+
+  The operation is atomic and totally ordered with respect to other
+  operations on the same semaphore.
+
+.. c:macro:: WINESYNC_IOC_PUT_MUTEX
+
+  Release a mutex object. Takes a pointer to struct
+  :c:type:`winesync_mutex_args`, which is used as follows:
+
+    ``mutex`` is an input-only argument denoting the mutex object. If
+    ``mutex`` is not a valid mutex object, the ioctl fails with
+    ``EINVAL``.
+
+    ``owner`` is an input-only argument denoting the mutex owner.
+    ``owner`` must be nonzero, else the ioctl fails with ``EINVAL``.
+    If ``owner`` is not the current owner of the mutex, the ioctl
+    fails with ``EPERM``.
+
+    ``count`` is an output-only argument which will be filled on
+    success with the mutex's previous recursion count.
+
+  The mutex's count will be decremented by one. The operation is
+  atomic and totally ordered with respect to other operations on the
+  same mutex. If decrementing the mutex's count causes it to become
+  zero, the mutex is marked as unowned and signaled, and eligible
+  threads waiting on it will be woken as appropriate.
+
+.. c:macro:: WINESYNC_IOC_READ_SEM
+
+  Read the current state of a semaphore object. Takes a pointer to
+  struct :c:type:`winesync_sem_args`, which is used as follows:
+
+    ``sem`` is an input-only argument denoting the semaphore object.
+    If ``sem`` is not a valid semaphore object, the ioctl fails with
+    ``EINVAL``.
+
+    ``count`` and ``max`` are output-only arguments, which will be
+    filled with the current and maximum count of the given semaphore.
+
+    ``flags`` is an output-only argument, which will be filled with
+    the flags used to create the semaphore.
+
+  The operation is atomic and totally ordered with respect to other
+  operations on the same semaphore.
+
+.. c:macro:: WINESYNC_IOC_READ_MUTEX
+
+  Read the current state of a mutex object. Takes a pointer to struct
+  :c:type:`winesync_mutex_args`, which is used as follows:
+
+    ``mutex`` is an input-only argument denoting the mutex object. If
+    ``mutex`` is not a valid mutex object, the ioctl fails with
+    ``EINVAL``.
+
+    ``count`` and ``owner`` are output-only arguments, which will be
+    filled with the current recursion count and owner of the given
+    mutex. If the mutex is not owned, both ``count`` and ``owner`` are
+    set to zero.
+
+  If the mutex is marked as inconsistent, the function fails with
+  ``EOWNERDEAD``.
+
+  The operation is atomic and totally ordered with respect to other
+  operations on the same mutex.
+
+.. c:macro:: WINESYNC_IOC_KILL_OWNER
+
+  Mark any mutexes owned by the given identifier as unowned and
+  inconsistent. Takes an input-only pointer to a 32-bit integer
+  denoting the owner. If the owner is zero, the ioctl fails with
+  ``EINVAL``.
+
+.. c:macro:: WINESYNC_IOC_WAIT_ANY
+
+  Poll on any of a list of objects, atomically acquiring (at most)
+  one. Takes a pointer to struct :c:type:`winesync_wait_args`, which
+  is used as follows:
+
+    ``timeout`` is an optional input-only pointer to a 64-bit struct
+    :c:type:`timespec` (specified as an integer so that the structure
+    has the same size regardless of architecture). The timeout is
+    specified in absolute format, as measured against the MONOTONIC
+    clock. If the timeout is equal to or earlier than the current
+    time, the function returns immediately without sleeping. If
+    ``timeout`` is zero, i.e. NULL, the function will sleep until an
+    object is signaled, and will not fail with ``ETIMEDOUT``.
+
+    ``objs`` is a input-only pointer to an array of ``count`` 32-bit
+    object identifiers (specified as an integer so that the structure
+    has the same size regardless of architecture). If any identifier
+    is invalid, the function fails with ``EINVAL``.
+
+    ``count`` is an input-only argument denoting the number of
+    elements in ``objs``.
+
+    ``owner`` is an input-only argument denoting the mutex owner
+    identifier. If any object in ``objs`` is a mutex, the ioctl will
+    attempt to acquire that mutex on behalf of ``owner``. If ``owner``
+    is zero, the ioctl fails with ``EINVAL``.
+
+    ``index`` is an output-only argument which, if the ioctl is
+    successful, is filled with the index of the object actually
+    signaled.
+
+    ``pad`` is unused, and exists to keep a consistent structure size.
+
+  This function attempts to acquire one of the given objects. If
+  unable to do so, it sleeps until an object becomes signaled,
+  subsequently acquiring it, or the timeout expires. In the latter
+  case the ioctl fails with ``ETIMEDOUT``. The function only acquires
+  one object, even if multiple objects are signaled.
+
+  A semaphore is considered to be signaled if its count is nonzero. It
+  is acquired by decrementing its count by one if the
+  ``WINESYNC_SEM_GETONWAIT`` flag was used to create it; otherwise no
+  operation is done to acquire the semaphore. A mutex is considered to
+  be signaled if it is unowned or if its owner matches the ``owner``
+  argument, and is acquired by incrementing its recursion count by one
+  and setting its owner to the ``owner`` argument.
+
+  Acquisition is atomic and totally ordered with respect to other
+  operations on the same object. If two wait operations (with
+  different ``owner`` identifiers) are queued on the same mutex, only
+  one is signaled. If two wait operations are queued on the same
+  semaphore (which was not created with the ``WINESYNC_SEM_GETONWAIT``
+  flag set), and a value of one is posted to it, only one is signaled.
+  The order in which threads are signaled is not guaranteed.
+
+  (If two wait operations are queued on the same semaphore, and the
+  semaphore was created with the ``WINESYNC_SEM_GETONWAIT`` flag set,
+  and a value of one is posted to it, both threads are signaled, and
+  the semaphore retains a count of one.)
+
+  If an inconsistent mutex is acquired, the ioctl fails with
+  ``EOWNERDEAD``. Although this is a failure return, the function may
+  otherwise be considered successful. The mutex is marked as owned by
+  the given owner (with a recursion count of 1) and as no longer
+  inconsistent. ``index`` is still set to the index of the mutex.
+
+  Unlike ``WINESYNC_IOC_WAIT_ALL``, it is valid to pass the same
+  object more than once. If a wakeup occurs due to that object being
+  signaled, ``index`` is set to the index of the first instance of the
+  object.
+
+  Fails with ``ENOMEM`` if not enough memory is available, or
+  ``EINTR`` if a signal is received.
+
+.. c:macro:: WINESYNC_IOC_WAIT_ALL
+
+  Poll on a list of objects, atomically acquiring all of them. Takes a
+  pointer to struct :c:type:`winesync_wait_args`, which is used
+  identically to ``WINESYNC_IOC_WAIT_ANY``, except that ``index`` is
+  unused.
+
+  This function attempts to simultaneously acquire all of the given
+  objects. If unable to do so, it sleeps until all objects become
+  simultaneously signaled, subsequently acquiring them, or the timeout
+  expires. In the latter case the ioctl fails with ``ETIMEDOUT`` and
+  no objects are modified.
+
+  Objects may become signaled and subsequently designaled (through
+  acquisition by other threads) while this thread is sleeping. Only
+  once all objects are simultaneously signaled does the ioctl return.
+  The acquisition is atomic and totally ordered with respect to other
+  operations on any of the given objects.
+
+  If an inconsistent mutex is acquired, the ioctl fails with
+  ``EOWNERDEAD``. Similarly to ``WINESYNC_IOC_WAIT_ANY``, all objects
+  are nevertheless marked as acquired. Note that if multiple mutex
+  objects are specified, there is no way to know which were marked as
+  inconsistent.
+
+  Unlike ``WINESYNC_IOC_WAIT_ALL``, it is not valid to pass the same
+  object more than once. If this is attempted, the function fails with
+  ``EINVAL``.
+
+  Fails with ``ENOMEM`` if not enough memory is available, or
+  ``EINTR`` if a signal is received.
diff --git a/MAINTAINERS b/MAINTAINERS
index bfc1b86e3e73..67ffab43fcd3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19194,6 +19194,15 @@ M:	David Härdeman <david@hardeman.nu>
 S:	Maintained
 F:	drivers/media/rc/winbond-cir.c
 
+WINESYNC SYNCHRONIZATION PRIMITIVE DRIVER
+M:	Zebediah Figura <zfigura@codeweavers.com>
+L:	wine-devel@winehq.org
+S:	Supported
+F:	Documentation/userspace-api/winesync.rst
+F:	drivers/misc/winesync.c
+F:	include/uapi/linux/winesync.c
+F:	tools/testing/selftests/drivers/winesync/
+
 WINSYSTEMS EBC-C384 WATCHDOG DRIVER
 M:	William Breathitt Gray <vilhelm.gray@gmail.com>
 L:	linux-watchdog@vger.kernel.org
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index fafa8b0d8099..25bf30ab958a 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -466,6 +466,17 @@ config HISI_HIKEY_USB
 	  switching between the dual-role USB-C port and the USB-A host ports
 	  using only one USB controller.
 
+config WINESYNC
+	tristate "Synchronization primitives for Wine"
+	help
+	  This module provides kernel support for synchronization primitives
+	  used by Wine. It is not a hardware driver.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called winesync.
+
+	  If unsure, say N.
+
 source "drivers/misc/c2port/Kconfig"
 source "drivers/misc/eeprom/Kconfig"
 source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index d23231e73330..8b1d4ae4ed1b 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -57,3 +57,4 @@ obj-$(CONFIG_HABANA_AI)		+= habanalabs/
 obj-$(CONFIG_UACCE)		+= uacce/
 obj-$(CONFIG_XILINX_SDFEC)	+= xilinx_sdfec.o
 obj-$(CONFIG_HISI_HIKEY_USB)	+= hisi_hikey_usb.o
+obj-$(CONFIG_WINESYNC)		+= winesync.o
diff --git a/drivers/misc/winesync.c b/drivers/misc/winesync.c
new file mode 100644
index 000000000000..a4c1dbc2a33e
--- /dev/null
+++ b/drivers/misc/winesync.c
@@ -0,0 +1,1047 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * winesync.c - Kernel driver for Wine synchronization primitives
+ *
+ * Copyright (C) 2021 Zebediah Figura
+ */
+
+#include <linux/fs.h>
+#include <linux/idr.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <uapi/linux/winesync.h>
+
+#define WINESYNC_NAME	"winesync"
+
+enum winesync_type {
+	WINESYNC_TYPE_SEM,
+	WINESYNC_TYPE_MUTEX,
+};
+
+struct winesync_obj {
+	struct kref refcount;
+	spinlock_t lock;
+
+	/*
+	 * any_waiters is protected by the object lock, but all_waiters is
+	 * protected by the device wait_all_lock.
+	 */
+	struct list_head any_waiters;
+	struct list_head all_waiters;
+
+	/*
+	 * Hint describing how many tasks are queued on this object in a
+	 * wait-all operation.
+	 *
+	 * Any time we do a wake, we may need to wake "all" waiters as well as
+	 * "any" waiters. In order to atomically wake "all" waiters, we must
+	 * lock all of the objects, and that means grabbing the wait_all_lock
+	 * below (and, due to lock ordering rules, before locking this object).
+	 * However, wait-all is a rare operation, and grabbing the wait-all
+	 * lock for every wake would create unnecessary contention. Therefore we
+	 * first check whether all_hint is one, and, if it is, we skip trying
+	 * to wake "all" waiters.
+	 *
+	 * This "refcount" isn't protected by any lock. It might change during
+	 * the course of a wake, but there's no meaningful race there; it's only
+	 * a hint.
+	 *
+	 * Use refcount_t rather than atomic_t to take advantage of saturation.
+	 * This does mean that the "no waiters" case is signified by all_hint
+	 * being one, rather than zero (otherwise we would get spurious
+	 * warnings).
+	 */
+	refcount_t all_hint;
+
+	enum winesync_type type;
+
+	/* The following fields are protected by the object lock. */
+	union {
+		struct {
+			__u32 count;
+			__u32 max;
+			__u32 flags;
+		} sem;
+		struct {
+			__u32 count;
+			__u32 owner;
+			bool ownerdead;
+		} mutex;
+	} u;
+};
+
+struct winesync_q_entry {
+	struct list_head node;
+	struct winesync_q *q;
+	struct winesync_obj *obj;
+	__u32 index;
+};
+
+struct winesync_q {
+	struct task_struct *task;
+	__u32 owner;
+
+	/*
+	 * Protected via atomic_cmpxchg(). Only the thread that wins the
+	 * compare-and-swap may actually change object states and wake this
+	 * task.
+	 */
+	atomic_t signaled;
+
+	bool all;
+	bool ownerdead;
+	__u32 count;
+	struct winesync_q_entry entries[];
+};
+
+struct winesync_device {
+	/*
+	 * Wait-all operations must atomically grab all objects, and be totally
+	 * ordered with respect to each other and wait-any operations. If one
+	 * thread is trying to acquire several objects, another thread cannot
+	 * touch the object at the same time.
+	 *
+	 * We achieve this by grabbing multiple object locks at the same time.
+	 * However, this creates a lock ordering problem. To solve that problem,
+	 * wait_all_lock is taken first whenever multiple objects must be locked
+	 * at the same time.
+	 */
+	spinlock_t wait_all_lock;
+	struct mutex table_lock;
+	struct idr objects;
+};
+
+static struct winesync_obj *get_obj(struct winesync_device *dev, int id)
+{
+	struct winesync_obj *obj;
+
+	rcu_read_lock();
+	obj = idr_find(&dev->objects, id);
+	if (obj && !kref_get_unless_zero(&obj->refcount))
+		obj = NULL;
+	rcu_read_unlock();
+
+	return obj;
+}
+
+static void destroy_obj(struct kref *ref)
+{
+	struct winesync_obj *obj;
+
+	obj = container_of(ref, struct winesync_obj, refcount);
+	kfree(obj);
+}
+
+static void put_obj(struct winesync_obj *obj)
+{
+	kref_put(&obj->refcount, destroy_obj);
+}
+
+static int winesync_char_open(struct inode *inode, struct file *file)
+{
+	struct winesync_device *dev;
+
+	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
+	if (!dev)
+		return -ENOMEM;
+
+	idr_init(&dev->objects);
+	spin_lock_init(&dev->wait_all_lock);
+	mutex_init(&dev->table_lock);
+
+	file->private_data = dev;
+	return nonseekable_open(inode, file);
+}
+
+static int winesync_char_release(struct inode *inode, struct file *file)
+{
+	struct winesync_device *dev = file->private_data;
+	struct winesync_obj *obj;
+	int id;
+
+	mutex_lock(&dev->table_lock);
+	idr_for_each_entry(&dev->objects, obj, id) {
+		idr_remove(&dev->objects, id);
+		synchronize_rcu();
+		put_obj(obj);
+	}
+	mutex_unlock(&dev->table_lock);
+
+	kfree(dev);
+
+	return 0;
+}
+
+static void winesync_init_obj(struct winesync_obj *obj)
+{
+	kref_init(&obj->refcount);
+	refcount_set(&obj->all_hint, 1);
+	spin_lock_init(&obj->lock);
+	INIT_LIST_HEAD(&obj->any_waiters);
+	INIT_LIST_HEAD(&obj->all_waiters);
+}
+
+static bool is_signaled(struct winesync_obj *obj, __u32 owner)
+{
+	lockdep_assert_held(&obj->lock);
+
+	switch (obj->type) {
+	case WINESYNC_TYPE_SEM:
+		return !!obj->u.sem.count;
+	case WINESYNC_TYPE_MUTEX:
+		if (obj->u.mutex.owner && obj->u.mutex.owner != owner)
+			return false;
+		return obj->u.mutex.count < UINT_MAX;
+	}
+
+	WARN(1, "bad object type %#x\n", obj->type);
+	return false;
+}
+
+/*
+ * "locked_obj" is an optional pointer to an object which is already locked and
+ * should not be locked again. This is necessary so that changing an object's
+ * state and waking it can be a single atomic operation.
+ */
+static void try_wake_all(struct winesync_device *dev, struct winesync_q *q,
+			 struct winesync_obj *locked_obj)
+{
+	__u32 count = q->count;
+	bool can_wake = true;
+	__u32 i;
+
+	lockdep_assert_held(&dev->wait_all_lock);
+	if (locked_obj)
+		lockdep_assert_held(&locked_obj->lock);
+
+	for (i = 0; i < count; i++) {
+		if (q->entries[i].obj != locked_obj)
+			spin_lock(&q->entries[i].obj->lock);
+	}
+
+	for (i = 0; i < count; i++) {
+		if (!is_signaled(q->entries[i].obj, q->owner)) {
+			can_wake = false;
+			break;
+		}
+	}
+
+	if (can_wake && atomic_cmpxchg(&q->signaled, -1, 0) == -1) {
+		for (i = 0; i < count; i++) {
+			struct winesync_obj *obj = q->entries[i].obj;
+
+			switch (obj->type) {
+			case WINESYNC_TYPE_SEM:
+				if (obj->u.sem.flags & WINESYNC_SEM_GETONWAIT)
+					obj->u.sem.count--;
+				break;
+			case WINESYNC_TYPE_MUTEX:
+				if (obj->u.mutex.ownerdead)
+					q->ownerdead = true;
+				obj->u.mutex.ownerdead = false;
+				obj->u.mutex.count++;
+				obj->u.mutex.owner = q->owner;
+				break;
+			}
+		}
+		wake_up_process(q->task);
+	}
+
+	for (i = 0; i < count; i++) {
+		if (q->entries[i].obj != locked_obj)
+			spin_unlock(&q->entries[i].obj->lock);
+	}
+}
+
+static void try_wake_all_obj(struct winesync_device *dev,
+			     struct winesync_obj *obj)
+{
+	struct winesync_q_entry *entry;
+
+	lockdep_assert_held(&dev->wait_all_lock);
+	lockdep_assert_held(&obj->lock);
+
+	list_for_each_entry(entry, &obj->all_waiters, node)
+		try_wake_all(dev, entry->q, obj);
+}
+
+static void try_wake_any_sem(struct winesync_obj *sem)
+{
+	struct winesync_q_entry *entry;
+
+	lockdep_assert_held(&sem->lock);
+
+	list_for_each_entry(entry, &sem->any_waiters, node) {
+		struct winesync_q *q = entry->q;
+
+		if (!sem->u.sem.count)
+			break;
+
+		if (atomic_cmpxchg(&q->signaled, -1, entry->index) == -1) {
+			if (sem->u.sem.flags & WINESYNC_SEM_GETONWAIT)
+				sem->u.sem.count--;
+			wake_up_process(q->task);
+		}
+	}
+}
+
+static void try_wake_any_mutex(struct winesync_obj *mutex)
+{
+	struct winesync_q_entry *entry;
+
+	lockdep_assert_held(&mutex->lock);
+
+	list_for_each_entry(entry, &mutex->any_waiters, node) {
+		struct winesync_q *q = entry->q;
+
+		if (mutex->u.mutex.count == UINT_MAX)
+			break;
+		if (mutex->u.mutex.owner && mutex->u.mutex.owner != q->owner)
+			continue;
+
+		if (atomic_cmpxchg(&q->signaled, -1, entry->index) == -1) {
+			if (mutex->u.mutex.ownerdead)
+				q->ownerdead = true;
+			mutex->u.mutex.ownerdead = false;
+			mutex->u.mutex.count++;
+			mutex->u.mutex.owner = q->owner;
+			wake_up_process(q->task);
+		}
+	}
+}
+
+static int winesync_create_sem(struct winesync_device *dev, void __user *argp)
+{
+	struct winesync_sem_args __user *user_args = argp;
+	struct winesync_sem_args args;
+	struct winesync_obj *sem;
+	int ret;
+
+	if (copy_from_user(&args, argp, sizeof(args)))
+		return -EFAULT;
+
+	if (args.count > args.max)
+		return -EINVAL;
+
+	if (args.flags & ~WINESYNC_SEM_GETONWAIT)
+		return -EINVAL;
+
+	sem = kzalloc(sizeof(*sem), GFP_KERNEL);
+	if (!sem)
+		return -ENOMEM;
+
+	winesync_init_obj(sem);
+	sem->type = WINESYNC_TYPE_SEM;
+	sem->u.sem.count = args.count;
+	sem->u.sem.max = args.max;
+	sem->u.sem.flags = args.flags;
+
+	mutex_lock(&dev->table_lock);
+	ret = idr_alloc(&dev->objects, sem, 0, 0, GFP_KERNEL);
+	mutex_unlock(&dev->table_lock);
+
+	if (ret < 0) {
+		kfree(sem);
+		return ret;
+	}
+
+	return put_user(ret, &user_args->sem);
+}
+
+static int winesync_create_mutex(struct winesync_device *dev, void __user *argp)
+{
+	struct winesync_mutex_args __user *user_args = argp;
+	struct winesync_mutex_args args;
+	struct winesync_obj *mutex;
+	int ret;
+
+	if (copy_from_user(&args, argp, sizeof(args)))
+		return -EFAULT;
+
+	if (!args.owner != !args.count)
+		return -EINVAL;
+
+	mutex = kzalloc(sizeof(*mutex), GFP_KERNEL);
+	if (!mutex)
+		return -ENOMEM;
+
+	winesync_init_obj(mutex);
+	mutex->type = WINESYNC_TYPE_MUTEX;
+	mutex->u.mutex.count = args.count;
+	mutex->u.mutex.owner = args.owner;
+
+	mutex_lock(&dev->table_lock);
+	ret = idr_alloc(&dev->objects, mutex, 0, 0, GFP_KERNEL);
+	mutex_unlock(&dev->table_lock);
+
+	if (ret < 0) {
+		kfree(mutex);
+		return ret;
+	}
+
+	return put_user(ret, &user_args->mutex);
+}
+
+static int winesync_delete(struct winesync_device *dev, void __user *argp)
+{
+	struct winesync_obj *obj;
+	__u32 id;
+
+	if (get_user(id, (__u32 __user *)argp))
+		return -EFAULT;
+
+	mutex_lock(&dev->table_lock);
+	obj = idr_remove(&dev->objects, id);
+	mutex_unlock(&dev->table_lock);
+
+	if (!obj)
+		return -EINVAL;
+
+	put_obj(obj);
+	return 0;
+}
+
+static int winesync_get_sem(struct winesync_device *dev, void __user *argp)
+{
+	struct winesync_obj *sem;
+	int ret = -EWOULDBLOCK;
+	__u32 id;
+
+	if (get_user(id, (__u32 __user *)argp))
+		return -EFAULT;
+
+	sem = get_obj(dev, id);
+	if (!sem)
+		return -EINVAL;
+	if (sem->type != WINESYNC_TYPE_SEM) {
+		put_obj(sem);
+		return -EINVAL;
+	}
+
+	spin_lock(&sem->lock);
+
+	if (sem->u.sem.count) {
+		/*
+		 * Decrement the semaphore's count, regardless of whether it
+		 * has the WINESYNC_SEM_GETONWAIT flag set.
+		 */
+		sem->u.sem.count--;
+		ret = 0;
+	}
+
+	spin_unlock(&sem->lock);
+
+	put_obj(sem);
+
+	return ret;
+}
+
+/*
+ * Actually change the semaphore state, returning -EOVERFLOW if it is made
+ * invalid.
+ */
+static int put_sem_state(struct winesync_obj *sem, __u32 count)
+{
+	lockdep_assert_held(&sem->lock);
+
+	if (sem->u.sem.count + count < sem->u.sem.count ||
+	    sem->u.sem.count + count > sem->u.sem.max)
+		return -EOVERFLOW;
+
+	sem->u.sem.count += count;
+	return 0;
+}
+
+static int winesync_put_sem(struct winesync_device *dev, void __user *argp,
+			    bool pulse)
+{
+	struct winesync_sem_args __user *user_args = argp;
+	struct winesync_sem_args args;
+	struct winesync_obj *sem;
+	__u32 prev_count;
+	int ret;
+
+	if (copy_from_user(&args, argp, sizeof(args)))
+		return -EFAULT;
+
+	sem = get_obj(dev, args.sem);
+	if (!sem)
+		return -EINVAL;
+	if (sem->type != WINESYNC_TYPE_SEM) {
+		put_obj(sem);
+		return -EINVAL;
+	}
+
+	if (refcount_read(&sem->all_hint) > 1) {
+		spin_lock(&dev->wait_all_lock);
+		spin_lock(&sem->lock);
+
+		prev_count = sem->u.sem.count;
+		ret = put_sem_state(sem, args.count);
+		if (!ret) {
+			try_wake_all_obj(dev, sem);
+			try_wake_any_sem(sem);
+		}
+
+		if (pulse)
+			sem->u.sem.count = 0;
+
+		spin_unlock(&sem->lock);
+		spin_unlock(&dev->wait_all_lock);
+	} else {
+		spin_lock(&sem->lock);
+
+		prev_count = sem->u.sem.count;
+		ret = put_sem_state(sem, args.count);
+		if (!ret)
+			try_wake_any_sem(sem);
+
+		if (pulse)
+			sem->u.sem.count = 0;
+
+		spin_unlock(&sem->lock);
+	}
+
+	put_obj(sem);
+
+	if (!ret && put_user(prev_count, &user_args->count))
+		ret = -EFAULT;
+
+	return ret;
+}
+
+/*
+ * Actually change the mutex state, returning -EPERM if not the owner.
+ */
+static int put_mutex_state(struct winesync_obj *mutex,
+			   const struct winesync_mutex_args *args)
+{
+	lockdep_assert_held(&mutex->lock);
+
+	if (mutex->u.mutex.owner != args->owner)
+		return -EPERM;
+
+	if (!--mutex->u.mutex.count)
+		mutex->u.mutex.owner = 0;
+	return 0;
+}
+
+static int winesync_put_mutex(struct winesync_device *dev, void __user *argp)
+{
+	struct winesync_mutex_args __user *user_args = argp;
+	struct winesync_mutex_args args;
+	struct winesync_obj *mutex;
+	__u32 prev_count;
+	int ret;
+
+	if (copy_from_user(&args, argp, sizeof(args)))
+		return -EFAULT;
+	if (!args.owner)
+		return -EINVAL;
+
+	mutex = get_obj(dev, args.mutex);
+	if (!mutex)
+		return -EINVAL;
+	if (mutex->type != WINESYNC_TYPE_MUTEX) {
+		put_obj(mutex);
+		return -EINVAL;
+	}
+
+	if (refcount_read(&mutex->all_hint) > 1) {
+		spin_lock(&dev->wait_all_lock);
+		spin_lock(&mutex->lock);
+
+		prev_count = mutex->u.mutex.count;
+		ret = put_mutex_state(mutex, &args);
+		if (!ret) {
+			try_wake_all_obj(dev, mutex);
+			try_wake_any_mutex(mutex);
+		}
+
+		spin_unlock(&mutex->lock);
+		spin_unlock(&dev->wait_all_lock);
+	} else {
+		spin_lock(&mutex->lock);
+
+		prev_count = mutex->u.mutex.count;
+		ret = put_mutex_state(mutex, &args);
+		if (!ret)
+			try_wake_any_mutex(mutex);
+
+		spin_unlock(&mutex->lock);
+	}
+
+	put_obj(mutex);
+
+	if (!ret && put_user(prev_count, &user_args->count))
+		ret = -EFAULT;
+
+	return ret;
+}
+
+static int winesync_read_sem(struct winesync_device *dev, void __user *argp)
+{
+	struct winesync_sem_args __user *user_args = argp;
+	struct winesync_sem_args args;
+	struct winesync_obj *sem;
+	__u32 id;
+
+	if (get_user(id, &user_args->sem))
+		return -EFAULT;
+
+	sem = get_obj(dev, id);
+	if (!sem)
+		return -EINVAL;
+	if (sem->type != WINESYNC_TYPE_SEM) {
+		put_obj(sem);
+		return -EINVAL;
+	}
+
+	args.sem = id;
+	spin_lock(&sem->lock);
+	args.count = sem->u.sem.count;
+	args.max = sem->u.sem.max;
+	args.flags = sem->u.sem.flags;
+	spin_unlock(&sem->lock);
+
+	put_obj(sem);
+
+	if (copy_to_user(user_args, &args, sizeof(args)))
+		return -EFAULT;
+	return 0;
+}
+
+static int winesync_read_mutex(struct winesync_device *dev, void __user *argp)
+{
+	struct winesync_mutex_args __user *user_args = argp;
+	struct winesync_mutex_args args;
+	struct winesync_obj *mutex;
+	__u32 id;
+	int ret;
+
+	if (get_user(id, &user_args->mutex))
+		return -EFAULT;
+
+	mutex = get_obj(dev, id);
+	if (!mutex)
+		return -EINVAL;
+	if (mutex->type != WINESYNC_TYPE_MUTEX) {
+		put_obj(mutex);
+		return -EINVAL;
+	}
+
+	args.mutex = id;
+	spin_lock(&mutex->lock);
+	args.count = mutex->u.mutex.count;
+	args.owner = mutex->u.mutex.owner;
+	ret = mutex->u.mutex.ownerdead ? -EOWNERDEAD : 0;
+	spin_unlock(&mutex->lock);
+
+	put_obj(mutex);
+
+	if (copy_to_user(user_args, &args, sizeof(args)))
+		return -EFAULT;
+	return ret;
+}
+
+/*
+ * Actually change the mutex state to mark its owner as dead.
+ */
+static void put_mutex_ownerdead_state(struct winesync_obj *mutex)
+{
+	lockdep_assert_held(&mutex->lock);
+
+	mutex->u.mutex.ownerdead = true;
+	mutex->u.mutex.owner = 0;
+	mutex->u.mutex.count = 0;
+}
+
+static int winesync_kill_owner(struct winesync_device *dev, void __user *argp)
+{
+	struct winesync_obj *obj;
+	__u32 owner;
+	int id;
+
+	if (get_user(owner, (__u32 __user *)argp))
+		return -EFAULT;
+	if (!owner)
+		return -EINVAL;
+
+	rcu_read_lock();
+
+	idr_for_each_entry(&dev->objects, obj, id) {
+		if (!kref_get_unless_zero(&obj->refcount))
+			continue;
+
+		if (obj->type != WINESYNC_TYPE_MUTEX) {
+			put_obj(obj);
+			continue;
+		}
+
+		if (refcount_read(&obj->all_hint) > 1) {
+			spin_lock(&dev->wait_all_lock);
+			spin_lock(&obj->lock);
+
+			if (obj->u.mutex.owner == owner) {
+				put_mutex_ownerdead_state(obj);
+				try_wake_all_obj(dev, obj);
+				try_wake_any_mutex(obj);
+			}
+
+			spin_unlock(&obj->lock);
+			spin_unlock(&dev->wait_all_lock);
+		} else {
+			spin_lock(&obj->lock);
+
+			if (obj->u.mutex.owner == owner) {
+				put_mutex_ownerdead_state(obj);
+				try_wake_any_mutex(obj);
+			}
+
+			spin_unlock(&obj->lock);
+		}
+
+		put_obj(obj);
+	}
+
+	rcu_read_unlock();
+
+	return 0;
+}
+
+static int winesync_schedule(const struct winesync_q *q, ktime_t *timeout)
+{
+	int ret = 0;
+
+	do {
+		if (signal_pending(current)) {
+			ret = -ERESTARTSYS;
+			break;
+		}
+
+		set_current_state(TASK_INTERRUPTIBLE);
+		if (atomic_read(&q->signaled) != -1) {
+			ret = 0;
+			break;
+		}
+		ret = schedule_hrtimeout(timeout, HRTIMER_MODE_ABS);
+	} while (ret < 0);
+	__set_current_state(TASK_RUNNING);
+
+	return ret;
+}
+
+/*
+ * Allocate and initialize most of the winesync_q structure, but do not queue us
+ * yet. Also, calculate the relative timeout in jiffies.
+ */
+static int setup_wait(struct winesync_device *dev,
+		      const struct winesync_wait_args *args, bool all,
+		      ktime_t *ret_timeout, struct winesync_q **ret_q)
+{
+	const __u32 count = args->count;
+	struct winesync_q *q;
+	ktime_t timeout = 0;
+	__u32 *ids;
+	__u32 i, j;
+
+	if (args->timeout) {
+		struct timespec64 to;
+
+		if (get_timespec64(&to, u64_to_user_ptr(args->timeout)))
+			return -EFAULT;
+		if (!timespec64_valid(&to))
+			return -EINVAL;
+
+		timeout = timespec64_to_ns(&to);
+	}
+
+	ids = kmalloc_array(args->count, sizeof(*ids), GFP_KERNEL);
+	if (!ids)
+		return -ENOMEM;
+	if (copy_from_user(ids, u64_to_user_ptr(args->objs),
+			   array_size(args->count, sizeof(*ids)))) {
+		kfree(ids);
+		return -EFAULT;
+	}
+
+	q = kmalloc(struct_size(q, entries, count), GFP_KERNEL);
+	if (!q) {
+		kfree(ids);
+		return -ENOMEM;
+	}
+	q->task = current;
+	q->owner = args->owner;
+	atomic_set(&q->signaled, -1);
+	q->all = all;
+	q->ownerdead = false;
+	q->count = count;
+
+	for (i = 0; i < count; i++) {
+		struct winesync_q_entry *entry = &q->entries[i];
+		struct winesync_obj *obj = get_obj(dev, ids[i]);
+
+		if (!obj)
+			goto err;
+
+		if (all) {
+			/* Check that the objects are all distinct. */
+			for (j = 0; j < i; j++) {
+				if (obj == q->entries[j].obj) {
+					put_obj(obj);
+					goto err;
+				}
+			}
+		}
+
+		entry->obj = obj;
+		entry->q = q;
+		entry->index = i;
+	}
+
+	kfree(ids);
+
+	*ret_q = q;
+	*ret_timeout = timeout;
+	return 0;
+
+err:
+	for (j = 0; j < i; j++)
+		put_obj(q->entries[j].obj);
+	kfree(ids);
+	kfree(q);
+	return -EINVAL;
+}
+
+static void try_wake_any_obj(struct winesync_obj *obj)
+{
+	switch (obj->type) {
+	case WINESYNC_TYPE_SEM:
+		try_wake_any_sem(obj);
+		break;
+	case WINESYNC_TYPE_MUTEX:
+		try_wake_any_mutex(obj);
+		break;
+	}
+}
+
+static int winesync_wait_any(struct winesync_device *dev, void __user *argp)
+{
+	struct winesync_wait_args args;
+	struct winesync_q *q;
+	ktime_t timeout;
+	__u32 i;
+	int ret;
+
+	if (copy_from_user(&args, argp, sizeof(args)))
+		return -EFAULT;
+	if (!args.owner)
+		return -EINVAL;
+
+	ret = setup_wait(dev, &args, false, &timeout, &q);
+	if (ret < 0)
+		return ret;
+
+	/* queue ourselves */
+
+	for (i = 0; i < args.count; i++) {
+		struct winesync_q_entry *entry = &q->entries[i];
+		struct winesync_obj *obj = q->entries[i].obj;
+
+		spin_lock(&obj->lock);
+		list_add_tail(&entry->node, &obj->any_waiters);
+		spin_unlock(&obj->lock);
+	}
+
+	/* check if we are already signaled */
+
+	for (i = 0; i < args.count; i++) {
+		struct winesync_obj *obj = q->entries[i].obj;
+
+		if (atomic_read(&q->signaled) != -1)
+			break;
+
+		spin_lock(&obj->lock);
+		try_wake_any_obj(obj);
+		spin_unlock(&obj->lock);
+	}
+
+	/* sleep */
+
+	ret = winesync_schedule(q, args.timeout ? &timeout : NULL);
+
+	/* and finally, unqueue */
+
+	for (i = 0; i < args.count; i++) {
+		struct winesync_obj *obj = q->entries[i].obj;
+
+		spin_lock(&obj->lock);
+		list_del(&q->entries[i].node);
+		spin_unlock(&obj->lock);
+
+		put_obj(obj);
+	}
+
+	if (atomic_read(&q->signaled) != -1) {
+		struct winesync_wait_args __user *user_args = argp;
+
+		/* even if we caught a signal, we need to communicate success */
+		ret = q->ownerdead ? -EOWNERDEAD : 0;
+
+		if (put_user(atomic_read(&q->signaled), &user_args->index))
+			ret = -EFAULT;
+	} else if (!ret) {
+		ret = -ETIMEDOUT;
+	}
+
+	kfree(q);
+	return ret;
+}
+
+static int winesync_wait_all(struct winesync_device *dev, void __user *argp)
+{
+	struct winesync_wait_args args;
+	struct winesync_q *q;
+	ktime_t timeout;
+	__u32 i;
+	int ret;
+
+	if (copy_from_user(&args, argp, sizeof(args)))
+		return -EFAULT;
+	if (!args.owner)
+		return -EINVAL;
+
+	ret = setup_wait(dev, &args, true, &timeout, &q);
+	if (ret < 0)
+		return ret;
+
+	/* queue ourselves */
+
+	spin_lock(&dev->wait_all_lock);
+
+	for (i = 0; i < args.count; i++) {
+		struct winesync_q_entry *entry = &q->entries[i];
+		struct winesync_obj *obj = q->entries[i].obj;
+
+		refcount_inc(&obj->all_hint);
+
+		/*
+		 * obj->all_waiters is protected by dev->wait_all_lock rather
+		 * than obj->lock, so there is no need to acquire it here.
+		 */
+		list_add_tail(&entry->node, &obj->all_waiters);
+	}
+
+	/* check if we are already signaled */
+
+	try_wake_all(dev, q, NULL);
+
+	spin_unlock(&dev->wait_all_lock);
+
+	/* sleep */
+
+	ret = winesync_schedule(q, args.timeout ? &timeout : NULL);
+
+	/* and finally, unqueue */
+
+	spin_lock(&dev->wait_all_lock);
+
+	for (i = 0; i < args.count; i++) {
+		struct winesync_q_entry *entry = &q->entries[i];
+		struct winesync_obj *obj = q->entries[i].obj;
+
+		/*
+		 * obj->all_waiters is protected by dev->wait_all_lock rather
+		 * than obj->lock, so there is no need to acquire it here.
+		 */
+		list_del(&entry->node);
+
+		refcount_dec(&obj->all_hint);
+
+		put_obj(obj);
+	}
+
+	spin_unlock(&dev->wait_all_lock);
+
+	if (atomic_read(&q->signaled) != -1) {
+		/* even if we caught a signal, we need to communicate success */
+		ret = q->ownerdead ? -EOWNERDEAD : 0;
+	} else if (!ret) {
+		ret = -ETIMEDOUT;
+	}
+
+	kfree(q);
+	return ret;
+}
+
+static long winesync_char_ioctl(struct file *file, unsigned int cmd,
+				unsigned long parm)
+{
+	struct winesync_device *dev = file->private_data;
+	void __user *argp = (void __user *)parm;
+
+	switch (cmd) {
+	case WINESYNC_IOC_CREATE_SEM:
+		return winesync_create_sem(dev, argp);
+	case WINESYNC_IOC_CREATE_MUTEX:
+		return winesync_create_mutex(dev, argp);
+	case WINESYNC_IOC_DELETE:
+		return winesync_delete(dev, argp);
+	case WINESYNC_IOC_GET_SEM:
+		return winesync_get_sem(dev, argp);
+	case WINESYNC_IOC_PUT_SEM:
+		return winesync_put_sem(dev, argp, false);
+	case WINESYNC_IOC_PULSE_SEM:
+		return winesync_put_sem(dev, argp, true);
+	case WINESYNC_IOC_PUT_MUTEX:
+		return winesync_put_mutex(dev, argp);
+	case WINESYNC_IOC_READ_SEM:
+		return winesync_read_sem(dev, argp);
+	case WINESYNC_IOC_READ_MUTEX:
+		return winesync_read_mutex(dev, argp);
+	case WINESYNC_IOC_KILL_OWNER:
+		return winesync_kill_owner(dev, argp);
+	case WINESYNC_IOC_WAIT_ANY:
+		return winesync_wait_any(dev, argp);
+	case WINESYNC_IOC_WAIT_ALL:
+		return winesync_wait_all(dev, argp);
+	default:
+		return -ENOSYS;
+	}
+}
+
+static const struct file_operations winesync_fops = {
+	.owner		= THIS_MODULE,
+	.open		= winesync_char_open,
+	.release	= winesync_char_release,
+	.unlocked_ioctl	= winesync_char_ioctl,
+	.compat_ioctl	= winesync_char_ioctl,
+	.llseek		= no_llseek,
+};
+
+static struct miscdevice winesync_misc = {
+	.minor		= WINESYNC_MINOR,
+	.name		= WINESYNC_NAME,
+	.fops		= &winesync_fops,
+};
+
+static int __init winesync_init(void)
+{
+	return misc_register(&winesync_misc);
+}
+
+static void __exit winesync_exit(void)
+{
+	misc_deregister(&winesync_misc);
+}
+
+module_init(winesync_init);
+module_exit(winesync_exit);
+
+MODULE_AUTHOR("Zebediah Figura");
+MODULE_DESCRIPTION("Kernel driver for Wine synchronization primitives");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("devname:" WINESYNC_NAME);
+MODULE_ALIAS_MISCDEV(WINESYNC_MINOR);
diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
index 0676f18093f9..350aecfcfb29 100644
--- a/include/linux/miscdevice.h
+++ b/include/linux/miscdevice.h
@@ -71,6 +71,7 @@
 #define USERIO_MINOR		240
 #define VHOST_VSOCK_MINOR	241
 #define RFKILL_MINOR		242
+#define WINESYNC_MINOR		243
 #define MISC_DYNAMIC_MINOR	255
 
 struct device;
diff --git a/include/uapi/linux/winesync.h b/include/uapi/linux/winesync.h
new file mode 100644
index 000000000000..c16f423dad48
--- /dev/null
+++ b/include/uapi/linux/winesync.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * Kernel support for Wine synchronization primitives
+ *
+ * Copyright (C) 2021 Zebediah Figura
+ */
+
+#ifndef __LINUX_WINESYNC_H
+#define __LINUX_WINESYNC_H
+
+#include <linux/types.h>
+
+#define WINESYNC_SEM_GETONWAIT 1
+
+struct winesync_sem_args {
+	__u32 sem;
+	__u32 count;
+	__u32 max;
+	__u32 flags;
+};
+
+struct winesync_mutex_args {
+	__u32 mutex;
+	__u32 owner;
+	__u32 count;
+};
+
+struct winesync_wait_args {
+	__u64 timeout;
+	__u64 objs;
+	__u32 count;
+	__u32 owner;
+	__u32 index;
+	__u32 pad;
+};
+
+#define WINESYNC_IOC_BASE 0xf7
+
+#define WINESYNC_IOC_CREATE_SEM		_IOWR(WINESYNC_IOC_BASE, 0, \
+					      struct winesync_sem_args)
+#define WINESYNC_IOC_CREATE_MUTEX	_IOWR(WINESYNC_IOC_BASE, 1, \
+					      struct winesync_mutex_args)
+#define WINESYNC_IOC_GET_SEM		_IOW (WINESYNC_IOC_BASE, 2, __u32)
+#define WINESYNC_IOC_PULSE_SEM		_IOWR(WINESYNC_IOC_BASE, 3, \
+					      struct winesync_sem_args)
+#define WINESYNC_IOC_PUT_SEM		_IOWR(WINESYNC_IOC_BASE, 5, \
+					      struct winesync_sem_args)
+#define WINESYNC_IOC_PUT_MUTEX		_IOWR(WINESYNC_IOC_BASE, 6, \
+					      struct winesync_mutex_args)
+#define WINESYNC_IOC_READ_SEM		_IOWR(WINESYNC_IOC_BASE, 7, \
+					      struct winesync_sem_args)
+#define WINESYNC_IOC_READ_MUTEX		_IOWR(WINESYNC_IOC_BASE, 8, \
+					      struct winesync_mutex_args)
+#define WINESYNC_IOC_KILL_OWNER		_IOW (WINESYNC_IOC_BASE, 9, __u32)
+#define WINESYNC_IOC_DELETE		_IOW (WINESYNC_IOC_BASE, 10, __u32)
+#define WINESYNC_IOC_WAIT_ANY		_IOWR(WINESYNC_IOC_BASE, 11, \
+					      struct winesync_wait_args)
+#define WINESYNC_IOC_WAIT_ALL		_IOW (WINESYNC_IOC_BASE, 12, \
+					      struct winesync_wait_args)
+
+#endif
diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
index 8a917cb4426a..ed5a7b052ef2 100644
--- a/tools/testing/selftests/Makefile
+++ b/tools/testing/selftests/Makefile
@@ -9,6 +9,7 @@ TARGETS += core
 TARGETS += cpufreq
 TARGETS += cpu-hotplug
 TARGETS += drivers/dma-buf
+TARGETS += drivers/winesync
 TARGETS += efivarfs
 TARGETS += exec
 TARGETS += filesystems
diff --git a/tools/testing/selftests/drivers/winesync/Makefile b/tools/testing/selftests/drivers/winesync/Makefile
new file mode 100644
index 000000000000..43b39fdeea10
--- /dev/null
+++ b/tools/testing/selftests/drivers/winesync/Makefile
@@ -0,0 +1,8 @@
+# SPDX-LICENSE-IDENTIFIER: GPL-2.0-only
+TEST_GEN_PROGS := winesync
+
+top_srcdir =../../../../..
+CFLAGS += -I$(top_srcdir)/usr/include
+LDLIBS += -lpthread
+
+include ../../lib.mk
diff --git a/tools/testing/selftests/drivers/winesync/config b/tools/testing/selftests/drivers/winesync/config
new file mode 100644
index 000000000000..60539c826d06
--- /dev/null
+++ b/tools/testing/selftests/drivers/winesync/config
@@ -0,0 +1 @@
+CONFIG_WINESYNC=y
diff --git a/tools/testing/selftests/drivers/winesync/winesync.c b/tools/testing/selftests/drivers/winesync/winesync.c
new file mode 100644
index 000000000000..c4ac22b7fdb7
--- /dev/null
+++ b/tools/testing/selftests/drivers/winesync/winesync.c
@@ -0,0 +1,1482 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Various unit tests for the "winesync" synchronization primitive driver.
+ *
+ * Copyright (C) 2021 Zebediah Figura
+ */
+
+#define _GNU_SOURCE
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <time.h>
+#include <pthread.h>
+#include <linux/winesync.h>
+#include "../../kselftest_harness.h"
+
+TEST(semaphore_state)
+{
+	struct winesync_wait_args wait_args;
+	struct winesync_sem_args sem_args;
+	struct timespec timeout;
+	int fd, ret;
+
+	clock_gettime(CLOCK_MONOTONIC, &timeout);
+
+	fd = open("/dev/winesync", O_CLOEXEC | O_RDONLY);
+	ASSERT_LE(0, fd);
+
+	sem_args.count = 3;
+	sem_args.max = 2;
+	sem_args.sem = 0xdeadbeef;
+	sem_args.flags = 0;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_SEM, &sem_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	sem_args.count = 2;
+	sem_args.max = 2;
+	sem_args.sem = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_NE(0xdeadbeef, sem_args.sem);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	sem_args.flags = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+	EXPECT_EQ(0, sem_args.flags);
+
+	sem_args.count = 0;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, sem_args.count);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	sem_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EOVERFLOW, errno);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	wait_args.timeout = (uintptr_t)&timeout;
+	wait_args.objs = (uintptr_t)&sem_args.sem;
+	wait_args.count = 1;
+	wait_args.owner = 123;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, wait_args.index);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	ret = ioctl(fd, WINESYNC_IOC_GET_SEM, &sem_args.sem);
+	EXPECT_EQ(0, ret);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	ret = ioctl(fd, WINESYNC_IOC_GET_SEM, &sem_args.sem);
+	EXPECT_EQ(0, ret);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	ret = ioctl(fd, WINESYNC_IOC_GET_SEM, &sem_args.sem);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EWOULDBLOCK, errno);
+
+	sem_args.count = 3;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EOVERFLOW, errno);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	sem_args.count = 2;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	ret = ioctl(fd, WINESYNC_IOC_GET_SEM, &sem_args.sem);
+	EXPECT_EQ(0, ret);
+	ret = ioctl(fd, WINESYNC_IOC_GET_SEM, &sem_args.sem);
+	EXPECT_EQ(0, ret);
+
+	sem_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	/* Test PULSE. */
+
+	sem_args.count = 2;
+	ret = ioctl(fd, WINESYNC_IOC_PULSE_SEM, &sem_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EOVERFLOW, errno);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	sem_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	sem_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_PULSE_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, sem_args.count);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	sem_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_PULSE_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	sem_args.count = 2;
+	ret = ioctl(fd, WINESYNC_IOC_PULSE_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	ret = ioctl(fd, WINESYNC_IOC_DELETE, &sem_args.sem);
+	EXPECT_EQ(0, ret);
+
+	close(fd);
+}
+
+TEST(semaphore_state_getonwait)
+{
+	struct winesync_wait_args wait_args;
+	struct winesync_sem_args sem_args;
+	struct timespec timeout;
+	int fd, ret;
+
+	clock_gettime(CLOCK_MONOTONIC, &timeout);
+
+	fd = open("/dev/winesync", O_CLOEXEC | O_RDONLY);
+	ASSERT_LE(0, fd);
+
+	sem_args.count = 3;
+	sem_args.max = 2;
+	sem_args.sem = 0xdeadbeef;
+	sem_args.flags = WINESYNC_SEM_GETONWAIT;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_SEM, &sem_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	sem_args.count = 2;
+	sem_args.max = 2;
+	sem_args.sem = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_NE(0xdeadbeef, sem_args.sem);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	sem_args.count = 0;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, sem_args.count);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	sem_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EOVERFLOW, errno);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	wait_args.timeout = (uintptr_t)&timeout;
+	wait_args.objs = (uintptr_t)&sem_args.sem;
+	wait_args.count = 1;
+	wait_args.owner = 123;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, wait_args.index);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, wait_args.index);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(ETIMEDOUT, errno);
+
+	sem_args.count = 3;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EOVERFLOW, errno);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	sem_args.count = 2;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+
+	sem_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	/* Test GET. */
+
+	ret = ioctl(fd, WINESYNC_IOC_GET_SEM, &sem_args.sem);
+	EXPECT_EQ(0, ret);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	ret = ioctl(fd, WINESYNC_IOC_GET_SEM, &sem_args.sem);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EWOULDBLOCK, errno);
+
+	sem_args.count = 2;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	ret = ioctl(fd, WINESYNC_IOC_GET_SEM, &sem_args.sem);
+	EXPECT_EQ(0, ret);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	/* Test PULSE. */
+
+	sem_args.count = 2;
+	ret = ioctl(fd, WINESYNC_IOC_PULSE_SEM, &sem_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EOVERFLOW, errno);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	sem_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	sem_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_PULSE_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, sem_args.count);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	sem_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_PULSE_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	sem_args.count = 2;
+	ret = ioctl(fd, WINESYNC_IOC_PULSE_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(2, sem_args.max);
+
+	ret = ioctl(fd, WINESYNC_IOC_DELETE, &sem_args.sem);
+	EXPECT_EQ(0, ret);
+
+	close(fd);
+}
+
+TEST(mutex_state)
+{
+	struct winesync_wait_args wait_args;
+	struct winesync_mutex_args mutex_args;
+	struct timespec timeout;
+	__u32 owner;
+	int fd, ret;
+
+	clock_gettime(CLOCK_MONOTONIC, &timeout);
+
+	fd = open("/dev/winesync", O_CLOEXEC | O_RDONLY);
+	ASSERT_LE(0, fd);
+
+	mutex_args.owner = 123;
+	mutex_args.count = 0;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_MUTEX, &mutex_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	mutex_args.owner = 0;
+	mutex_args.count = 2;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_MUTEX, &mutex_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	mutex_args.owner = 123;
+	mutex_args.count = 2;
+	mutex_args.mutex = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_NE(0xdeadbeef, mutex_args.mutex);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, mutex_args.count);
+	EXPECT_EQ(123, mutex_args.owner);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_MUTEX, &mutex_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 456;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_MUTEX, &mutex_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EPERM, errno);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, mutex_args.count);
+	EXPECT_EQ(123, mutex_args.owner);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 123;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, mutex_args.count);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+	EXPECT_EQ(123, mutex_args.owner);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 123;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, mutex_args.count);
+	EXPECT_EQ(0, mutex_args.owner);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 123;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_MUTEX, &mutex_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EPERM, errno);
+
+	wait_args.timeout = (uintptr_t)&timeout;
+	wait_args.objs = (uintptr_t)&mutex_args.mutex;
+	wait_args.count = 1;
+	wait_args.owner = 456;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, wait_args.index);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+	EXPECT_EQ(456, mutex_args.owner);
+
+	wait_args.owner = 456;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, wait_args.index);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, mutex_args.count);
+	EXPECT_EQ(456, mutex_args.owner);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 456;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, mutex_args.count);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+	EXPECT_EQ(456, mutex_args.owner);
+
+	wait_args.owner = 123;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(ETIMEDOUT, errno);
+
+	owner = 0;
+	ret = ioctl(fd, WINESYNC_IOC_KILL_OWNER, &owner);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	owner = 123;
+	ret = ioctl(fd, WINESYNC_IOC_KILL_OWNER, &owner);
+	EXPECT_EQ(0, ret);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+	EXPECT_EQ(456, mutex_args.owner);
+
+	owner = 456;
+	ret = ioctl(fd, WINESYNC_IOC_KILL_OWNER, &owner);
+	EXPECT_EQ(0, ret);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EOWNERDEAD, errno);
+	EXPECT_EQ(0, mutex_args.count);
+	EXPECT_EQ(0, mutex_args.owner);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EOWNERDEAD, errno);
+	EXPECT_EQ(0, mutex_args.count);
+	EXPECT_EQ(0, mutex_args.owner);
+
+	wait_args.owner = 123;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EOWNERDEAD, errno);
+	EXPECT_EQ(0, wait_args.index);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+	EXPECT_EQ(123, mutex_args.owner);
+
+	owner = 123;
+	ret = ioctl(fd, WINESYNC_IOC_KILL_OWNER, &owner);
+	EXPECT_EQ(0, ret);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EOWNERDEAD, errno);
+	EXPECT_EQ(0, mutex_args.count);
+	EXPECT_EQ(0, mutex_args.owner);
+
+	wait_args.owner = 123;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EOWNERDEAD, errno);
+	EXPECT_EQ(0, wait_args.index);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+	EXPECT_EQ(123, mutex_args.owner);
+
+	ret = ioctl(fd, WINESYNC_IOC_DELETE, &mutex_args.mutex);
+	EXPECT_EQ(0, ret);
+
+	mutex_args.owner = 0;
+	mutex_args.count = 0;
+	mutex_args.mutex = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_NE(0xdeadbeef, mutex_args.mutex);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, mutex_args.count);
+	EXPECT_EQ(0, mutex_args.owner);
+
+	wait_args.owner = 123;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, wait_args.index);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+	EXPECT_EQ(123, mutex_args.owner);
+
+	ret = ioctl(fd, WINESYNC_IOC_DELETE, &mutex_args.mutex);
+	EXPECT_EQ(0, ret);
+
+	close(fd);
+}
+
+TEST(wait_any)
+{
+	struct winesync_mutex_args mutex_args = {0};
+	struct winesync_wait_args wait_args = {0};
+	struct winesync_sem_args sem_args = {0};
+	struct timespec timeout;
+	__u32 objs[2], owner;
+	int fd, ret;
+
+	clock_gettime(CLOCK_MONOTONIC, &timeout);
+
+	fd = open("/dev/winesync", O_CLOEXEC | O_RDONLY);
+	ASSERT_LE(0, fd);
+
+	sem_args.count = 2;
+	sem_args.max = 3;
+	sem_args.sem = 0xdeadbeef;
+	sem_args.flags = WINESYNC_SEM_GETONWAIT;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_NE(0xdeadbeef, sem_args.sem);
+
+	mutex_args.owner = 0;
+	mutex_args.count = 0;
+	mutex_args.mutex = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_NE(0xdeadbeef, mutex_args.mutex);
+
+	objs[0] = sem_args.sem;
+	objs[1] = mutex_args.mutex;
+
+	wait_args.timeout = (uintptr_t)&timeout;
+	wait_args.objs = (uintptr_t)objs;
+	wait_args.count = 2;
+	wait_args.owner = 123;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, wait_args.index);
+	EXPECT_EQ((uintptr_t)objs, wait_args.objs);
+	EXPECT_EQ(2, wait_args.count);
+	EXPECT_EQ(123, wait_args.owner);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, sem_args.count);
+	EXPECT_EQ(3, sem_args.max);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, mutex_args.count);
+	EXPECT_EQ(0, mutex_args.owner);
+
+	wait_args.owner = 123;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, wait_args.index);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(3, sem_args.max);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, mutex_args.count);
+	EXPECT_EQ(0, mutex_args.owner);
+
+	wait_args.owner = 123;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, wait_args.index);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(3, sem_args.max);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+	EXPECT_EQ(123, mutex_args.owner);
+
+	sem_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	wait_args.owner = 123;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, wait_args.index);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(3, sem_args.max);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+	EXPECT_EQ(123, mutex_args.owner);
+
+	wait_args.owner = 123;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, wait_args.index);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(3, sem_args.max);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, mutex_args.count);
+	EXPECT_EQ(123, mutex_args.owner);
+
+	wait_args.owner = 456;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(ETIMEDOUT, errno);
+
+	owner = 123;
+	ret = ioctl(fd, WINESYNC_IOC_KILL_OWNER, &owner);
+	EXPECT_EQ(0, ret);
+
+	wait_args.owner = 456;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EOWNERDEAD, errno);
+	EXPECT_EQ(1, wait_args.index);
+
+	wait_args.owner = 456;
+	wait_args.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, wait_args.index);
+
+	/* test waiting on the same object twice */
+	sem_args.count = 2;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	objs[0] = objs[1] = sem_args.sem;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, wait_args.index);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, sem_args.count);
+	EXPECT_EQ(3, sem_args.max);
+
+	wait_args.count = 0;
+	wait_args.objs = (uintptr_t)NULL;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(ETIMEDOUT, errno);
+
+	ret = ioctl(fd, WINESYNC_IOC_DELETE, &sem_args.sem);
+	EXPECT_EQ(0, ret);
+	ret = ioctl(fd, WINESYNC_IOC_DELETE, &mutex_args.mutex);
+	EXPECT_EQ(0, ret);
+
+	close(fd);
+}
+
+TEST(wait_all)
+{
+	struct winesync_mutex_args mutex_args = {0};
+	struct winesync_wait_args wait_args = {0};
+	struct winesync_sem_args sem_args = {0};
+	struct timespec timeout;
+	__u32 objs[2], owner;
+	int fd, ret;
+
+	clock_gettime(CLOCK_MONOTONIC, &timeout);
+
+	fd = open("/dev/winesync", O_CLOEXEC | O_RDONLY);
+	ASSERT_LE(0, fd);
+
+	sem_args.count = 2;
+	sem_args.max = 3;
+	sem_args.sem = 0xdeadbeef;
+	sem_args.flags = WINESYNC_SEM_GETONWAIT;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_NE(0xdeadbeef, sem_args.sem);
+
+	mutex_args.owner = 0;
+	mutex_args.count = 0;
+	mutex_args.mutex = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_NE(0xdeadbeef, mutex_args.mutex);
+
+	objs[0] = sem_args.sem;
+	objs[1] = mutex_args.mutex;
+
+	wait_args.timeout = (uintptr_t)&timeout;
+	wait_args.objs = (uintptr_t)objs;
+	wait_args.count = 2;
+	wait_args.owner = 123;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ALL, &wait_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ((uintptr_t)objs, wait_args.objs);
+	EXPECT_EQ(2, wait_args.count);
+	EXPECT_EQ(123, wait_args.owner);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, sem_args.count);
+	EXPECT_EQ(3, sem_args.max);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+	EXPECT_EQ(123, mutex_args.owner);
+
+	wait_args.owner = 456;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ALL, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(ETIMEDOUT, errno);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, sem_args.count);
+	EXPECT_EQ(3, sem_args.max);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+	EXPECT_EQ(123, mutex_args.owner);
+
+	wait_args.owner = 123;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ALL, &wait_args);
+	EXPECT_EQ(0, ret);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(3, sem_args.max);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, mutex_args.count);
+	EXPECT_EQ(123, mutex_args.owner);
+
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ALL, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(ETIMEDOUT, errno);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+	EXPECT_EQ(3, sem_args.max);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, mutex_args.count);
+	EXPECT_EQ(123, mutex_args.owner);
+
+	sem_args.count = 3;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	owner = 123;
+	ret = ioctl(fd, WINESYNC_IOC_KILL_OWNER, &owner);
+	EXPECT_EQ(0, ret);
+
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ALL, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EOWNERDEAD, errno);
+
+	sem_args.count = 0xdeadbeef;
+	sem_args.max = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, sem_args.count);
+	EXPECT_EQ(3, sem_args.max);
+
+	mutex_args.count = 0xdeadbeef;
+	mutex_args.owner = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+	EXPECT_EQ(123, mutex_args.owner);
+
+	/* test waiting on the same object twice */
+	objs[0] = objs[1] = sem_args.sem;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ALL, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	ret = ioctl(fd, WINESYNC_IOC_DELETE, &sem_args.sem);
+	EXPECT_EQ(0, ret);
+	ret = ioctl(fd, WINESYNC_IOC_DELETE, &mutex_args.mutex);
+	EXPECT_EQ(0, ret);
+
+	close(fd);
+}
+
+TEST(invalid_objects)
+{
+	struct winesync_mutex_args mutex_args = {0};
+	struct winesync_wait_args wait_args = {0};
+	struct winesync_sem_args sem_args = {0};
+	__u32 objs[2] = {0};
+	int fd, ret;
+
+	fd = open("/dev/winesync", O_CLOEXEC | O_RDONLY);
+	ASSERT_LE(0, fd);
+
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	ret = ioctl(fd, WINESYNC_IOC_PULSE_SEM, &sem_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	ret = ioctl(fd, WINESYNC_IOC_GET_SEM, &sem_args.sem);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	ret = ioctl(fd, WINESYNC_IOC_PUT_MUTEX, &mutex_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	wait_args.objs = (uintptr_t)objs;
+	wait_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ALL, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	ret = ioctl(fd, WINESYNC_IOC_DELETE, &objs[0]);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	sem_args.max = 1;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+
+	mutex_args.mutex = sem_args.sem;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_MUTEX, &mutex_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	objs[0] = sem_args.sem;
+	objs[1] = sem_args.sem + 1;
+	wait_args.count = 2;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ALL, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	objs[0] = sem_args.sem + 1;
+	objs[1] = sem_args.sem;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ALL, &wait_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	ret = ioctl(fd, WINESYNC_IOC_DELETE, &sem_args.sem);
+	EXPECT_EQ(0, ret);
+
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+
+	sem_args.sem = mutex_args.mutex;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(-1, ret);
+	EXPECT_EQ(EINVAL, errno);
+
+	ret = ioctl(fd, WINESYNC_IOC_DELETE, &mutex_args.mutex);
+	EXPECT_EQ(0, ret);
+
+	close(fd);
+}
+
+struct wake_args
+{
+	int fd;
+	__u32 obj;
+};
+
+struct wait_args
+{
+	int fd;
+	unsigned long request;
+	struct winesync_wait_args *args;
+	int ret;
+	int err;
+};
+
+static void *wait_thread(void *arg)
+{
+	struct wait_args *args = arg;
+
+	args->ret = ioctl(args->fd, args->request, args->args);
+	args->err = errno;
+	return NULL;
+}
+
+static void get_abs_timeout(struct timespec *timeout, clockid_t clock,
+			    unsigned int ms)
+{
+	clock_gettime(clock, timeout);
+	timeout->tv_nsec += ms * 1000000;
+	timeout->tv_sec += (timeout->tv_nsec / 1000000000);
+	timeout->tv_nsec %= 1000000000;
+}
+
+static int wait_for_thread(pthread_t thread, unsigned int ms)
+{
+	struct timespec timeout;
+	get_abs_timeout(&timeout, CLOCK_REALTIME, ms);
+	return pthread_timedjoin_np(thread, NULL, &timeout);
+}
+
+TEST(wake_any)
+{
+	struct winesync_mutex_args mutex_args = {0};
+	struct winesync_wait_args wait_args = {0};
+	struct winesync_sem_args sem_args = {0};
+	struct wait_args thread_args;
+	struct timespec timeout;
+	__u32 objs[2], owner;
+	pthread_t thread;
+	int fd, ret;
+
+	fd = open("/dev/winesync", O_CLOEXEC | O_RDONLY);
+	ASSERT_LE(0, fd);
+
+	sem_args.count = 0;
+	sem_args.max = 3;
+	sem_args.sem = 0xdeadbeef;
+	sem_args.flags = WINESYNC_SEM_GETONWAIT;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_NE(0xdeadbeef, sem_args.sem);
+
+	mutex_args.owner = 123;
+	mutex_args.count = 1;
+	mutex_args.mutex = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_NE(0xdeadbeef, mutex_args.mutex);
+
+	objs[0] = sem_args.sem;
+	objs[1] = mutex_args.mutex;
+
+	/* test waking the semaphore */
+
+	get_abs_timeout(&timeout, CLOCK_MONOTONIC, 1000);
+	wait_args.timeout = (uintptr_t)&timeout;
+	wait_args.objs = (uintptr_t)objs;
+	wait_args.count = 2;
+	wait_args.owner = 456;
+	wait_args.index = 0xdeadbeef;
+	thread_args.fd = fd;
+	thread_args.args = &wait_args;
+	thread_args.request = WINESYNC_IOC_WAIT_ANY;
+	ret = pthread_create(&thread, NULL, wait_thread, &thread_args);
+	EXPECT_EQ(0, ret);
+
+	ret = wait_for_thread(thread, 100);
+	EXPECT_EQ(ETIMEDOUT, ret);
+
+	sem_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	ret = wait_for_thread(thread, 100);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, thread_args.ret);
+	EXPECT_EQ(0, wait_args.index);
+
+	/* test waking the semaphore via pulse */
+
+	get_abs_timeout(&timeout, CLOCK_MONOTONIC, 1000);
+	wait_args.owner = 456;
+	ret = pthread_create(&thread, NULL, wait_thread, &thread_args);
+	EXPECT_EQ(0, ret);
+
+	ret = wait_for_thread(thread, 100);
+	EXPECT_EQ(ETIMEDOUT, ret);
+
+	sem_args.count = 2;
+	ret = ioctl(fd, WINESYNC_IOC_PULSE_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	ret = wait_for_thread(thread, 100);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, thread_args.ret);
+	EXPECT_EQ(0, wait_args.index);
+
+	/* test waking the mutex */
+
+	/* first grab it again for owner 123 */
+	wait_args.owner = 123;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, wait_args.index);
+
+	get_abs_timeout(&timeout, CLOCK_MONOTONIC, 1000);
+	wait_args.owner = 456;
+	ret = pthread_create(&thread, NULL, wait_thread, &thread_args);
+	EXPECT_EQ(0, ret);
+
+	ret = wait_for_thread(thread, 100);
+	EXPECT_EQ(ETIMEDOUT, ret);
+
+	mutex_args.owner = 123;
+	mutex_args.count = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(2, mutex_args.count);
+
+	ret = pthread_tryjoin_np(thread, NULL);
+	EXPECT_EQ(EBUSY, ret);
+
+	mutex_args.owner = 123;
+	mutex_args.count = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+	EXPECT_EQ(456, mutex_args.owner);
+
+	ret = wait_for_thread(thread, 100);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, thread_args.ret);
+	EXPECT_EQ(1, wait_args.index);
+
+	/* delete an object while it's being waited on */
+
+	get_abs_timeout(&timeout, CLOCK_MONOTONIC, 200);
+	wait_args.owner = 123;
+	ret = pthread_create(&thread, NULL, wait_thread, &thread_args);
+	EXPECT_EQ(0, ret);
+
+	ret = wait_for_thread(thread, 100);
+	EXPECT_EQ(ETIMEDOUT, ret);
+
+	ret = ioctl(fd, WINESYNC_IOC_DELETE, &sem_args.sem);
+	EXPECT_EQ(0, ret);
+	ret = ioctl(fd, WINESYNC_IOC_DELETE, &mutex_args.mutex);
+	EXPECT_EQ(0, ret);
+
+	ret = wait_for_thread(thread, 200);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(-1, thread_args.ret);
+	EXPECT_EQ(ETIMEDOUT, thread_args.err);
+
+	close(fd);
+}
+
+TEST(wake_all)
+{
+	struct winesync_wait_args wait_args = {0}, wait_args2 = {0};
+	struct winesync_mutex_args mutex_args = {0};
+	struct winesync_sem_args sem_args = {0};
+	struct timespec timeout, timeout2;
+	struct wait_args thread_args;
+	__u32 objs[2], owner;
+	pthread_t thread;
+	int fd, ret;
+
+	fd = open("/dev/winesync", O_CLOEXEC | O_RDONLY);
+	ASSERT_LE(0, fd);
+
+	sem_args.count = 0;
+	sem_args.max = 3;
+	sem_args.sem = 0xdeadbeef;
+	sem_args.flags = WINESYNC_SEM_GETONWAIT;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_NE(0xdeadbeef, sem_args.sem);
+
+	mutex_args.owner = 123;
+	mutex_args.count = 1;
+	mutex_args.mutex = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_CREATE_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_NE(0xdeadbeef, mutex_args.mutex);
+
+	objs[0] = sem_args.sem;
+	objs[1] = mutex_args.mutex;
+
+	get_abs_timeout(&timeout, CLOCK_MONOTONIC, 1000);
+	wait_args.timeout = (uintptr_t)&timeout;
+	wait_args.objs = (uintptr_t)objs;
+	wait_args.count = 2;
+	wait_args.owner = 456;
+	thread_args.fd = fd;
+	thread_args.args = &wait_args;
+	thread_args.request = WINESYNC_IOC_WAIT_ALL;
+	ret = pthread_create(&thread, NULL, wait_thread, &thread_args);
+	EXPECT_EQ(0, ret);
+
+	ret = wait_for_thread(thread, 100);
+	EXPECT_EQ(ETIMEDOUT, ret);
+
+	sem_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	ret = pthread_tryjoin_np(thread, NULL);
+	EXPECT_EQ(EBUSY, ret);
+
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, sem_args.count);
+
+	get_abs_timeout(&timeout2, CLOCK_MONOTONIC, 0);
+	wait_args2.timeout = (uintptr_t)&timeout2;
+	wait_args2.objs = (uintptr_t)&sem_args.sem;
+	wait_args2.count = 1;
+	wait_args2.owner = 123;
+	wait_args2.index = 0xdeadbeef;
+	ret = ioctl(fd, WINESYNC_IOC_WAIT_ANY, &wait_args2);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, wait_args2.index);
+
+	mutex_args.owner = 123;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+
+	ret = pthread_tryjoin_np(thread, NULL);
+	EXPECT_EQ(EBUSY, ret);
+
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, mutex_args.count);
+	EXPECT_EQ(0, mutex_args.owner);
+
+	sem_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_PUT_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	ret = ioctl(fd, WINESYNC_IOC_READ_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	ret = ioctl(fd, WINESYNC_IOC_READ_MUTEX, &mutex_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(1, mutex_args.count);
+	EXPECT_EQ(456, mutex_args.owner);
+
+	ret = wait_for_thread(thread, 100);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, thread_args.ret);
+
+	/* test waking the semaphore via pulse */
+
+	get_abs_timeout(&timeout, CLOCK_MONOTONIC, 1000);
+	wait_args.owner = 456;
+	ret = pthread_create(&thread, NULL, wait_thread, &thread_args);
+	EXPECT_EQ(0, ret);
+
+	ret = wait_for_thread(thread, 100);
+	EXPECT_EQ(ETIMEDOUT, ret);
+
+	sem_args.count = 1;
+	ret = ioctl(fd, WINESYNC_IOC_PULSE_SEM, &sem_args);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, sem_args.count);
+
+	ret = wait_for_thread(thread, 100);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(0, thread_args.ret);
+
+	/* delete an object while it's being waited on */
+
+	get_abs_timeout(&timeout, CLOCK_MONOTONIC, 200);
+	wait_args.owner = 123;
+	ret = pthread_create(&thread, NULL, wait_thread, &thread_args);
+	EXPECT_EQ(0, ret);
+
+	ret = wait_for_thread(thread, 100);
+	EXPECT_EQ(ETIMEDOUT, ret);
+
+	ret = ioctl(fd, WINESYNC_IOC_DELETE, &sem_args.sem);
+	EXPECT_EQ(0, ret);
+	ret = ioctl(fd, WINESYNC_IOC_DELETE, &mutex_args.mutex);
+	EXPECT_EQ(0, ret);
+
+	ret = wait_for_thread(thread, 200);
+	EXPECT_EQ(0, ret);
+	EXPECT_EQ(-1, thread_args.ret);
+	EXPECT_EQ(ETIMEDOUT, thread_args.err);
+
+	close(fd);
+}
+
+TEST_HARNESS_MAIN
