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Kernel: Added real support for thread and event blocking

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- SVC: Added ExitThread support
- SVC: Added SignalEvent support
- Thread: Added WAITTYPE_EVENT for waiting threads for event signals
- Thread: Added support for blocking on other threads to finish (e.g. Thread::Join)
- Thread: Added debug function for printing current threads ready for execution
- Thread: Removed hack/broken thread ready state code from Kernel::Reschedule
- Mutex: Moved WaitCurrentThread from SVC to Mutex::WaitSynchronization
- Event: Added support for blocking threads on event signalling

Kernel: Added missing algorithm #include for use of std::find on non-Windows platforms.
This commit is contained in:
bunnei
2014-06-05 22:35:36 -04:00
parent a002abf171
commit f5c7c15434
6 changed files with 196 additions and 76 deletions
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71
src/core/hle/kernel/event.cpp
View File

@@ -3,12 +3,14 @@
// Refer to the license.txt file included.
#include <map>
#include <algorithm>
#include <vector>
#include "common/common.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/event.h"
#include "core/hle/kernel/thread.h"
namespace Kernel {
@@ -20,12 +22,13 @@ public:
static Kernel::HandleType GetStaticHandleType() { return Kernel::HandleType::Event; }
Kernel::HandleType GetHandleType() const { return Kernel::HandleType::Event; }
ResetType intitial_reset_type; ///< ResetType specified at Event initialization
ResetType reset_type; ///< Current ResetType
ResetType intitial_reset_type; ///< ResetType specified at Event initialization
ResetType reset_type; ///< Current ResetType
bool locked; ///< Current locked state
bool permanent_locked; ///< Hack - to set event permanent state (for easy passthrough)
std::string name; ///< Name of event (optional)
bool locked; ///< Event signal wait
bool permanent_locked; ///< Hack - to set event permanent state (for easy passthrough)
std::vector<Handle> waiting_threads; ///< Threads that are waiting for the event
std::string name; ///< Name of event (optional)
/**
* Synchronize kernel object
@@ -44,8 +47,14 @@ public:
* @return Result of operation, 0 on success, otherwise error code
*/
Result WaitSynchronization(bool* wait) {
// TODO(bunnei): ImplementMe
*wait = locked;
if (locked) {
Handle thread = GetCurrentThreadHandle();
if (std::find(waiting_threads.begin(), waiting_threads.end(), thread) == waiting_threads.end()) {
waiting_threads.push_back(thread);
}
Kernel::WaitCurrentThread(WAITTYPE_EVENT);
}
if (reset_type != RESETTYPE_STICKY && !permanent_locked) {
locked = true;
}
@@ -53,6 +62,22 @@ public:
}
};
/**
* Hackish function to set an events permanent lock state, used to pass through synch blocks
* @param handle Handle to event to change
* @param permanent_locked Boolean permanent locked value to set event
* @return Result of operation, 0 on success, otherwise error code
*/
Result SetPermanentLock(Handle handle, const bool permanent_locked) {
Event* evt = g_object_pool.GetFast<Event>(handle);
if (!evt) {
ERROR_LOG(KERNEL, "called with unknown handle=0x%08X", handle);
return -1;
}
evt->permanent_locked = permanent_locked;
return 0;
}
/**
* Changes whether an event is locked or not
* @param handle Handle to event to change
@@ -72,18 +97,32 @@ Result SetEventLocked(const Handle handle, const bool locked) {
}
/**
* Hackish function to set an events permanent lock state, used to pass through synch blocks
* @param handle Handle to event to change
* @param permanent_locked Boolean permanent locked value to set event
* Signals an event
* @param handle Handle to event to signal
* @return Result of operation, 0 on success, otherwise error code
*/
Result SetPermanentLock(Handle handle, const bool permanent_locked) {
Result SignalEvent(const Handle handle) {
Event* evt = g_object_pool.GetFast<Event>(handle);
if (!evt) {
ERROR_LOG(KERNEL, "called with unknown handle=0x%08X", handle);
return -1;
}
evt->permanent_locked = permanent_locked;
// Resume threads waiting for event to signal
bool event_caught = false;
for (size_t i = 0; i < evt->waiting_threads.size(); ++i) {
ResumeThreadFromWait( evt->waiting_threads[i]);
// If any thread is signalled awake by this event, assume the event was "caught" and reset
// the event. This will result in the next thread waiting on the event to block. Otherwise,
// the event will not be reset, and the next thread to call WaitSynchronization on it will
// not block. Not sure if this is correct behavior, but it seems to work.
event_caught = true;
}
evt->waiting_threads.clear();
if (!evt->permanent_locked) {
evt->locked = event_caught;
}
return 0;
}
@@ -93,7 +132,15 @@ Result SetPermanentLock(Handle handle, const bool permanent_locked) {
* @return Result of operation, 0 on success, otherwise error code
*/
Result ClearEvent(Handle handle) {
return SetEventLocked(handle, true);
Event* evt = g_object_pool.GetFast<Event>(handle);
if (!evt) {
ERROR_LOG(KERNEL, "called with unknown handle=0x%08X", handle);
return -1;
}
if (!evt->permanent_locked) {
evt->locked = true;
}
return 0;
}
/**

7
src/core/hle/kernel/event.h
View File

@@ -27,6 +27,13 @@ Result SetEventLocked(const Handle handle, const bool locked);
*/
Result SetPermanentLock(Handle handle, const bool permanent_locked);
/**
* Signals an event
* @param handle Handle to event to signal
* @return Result of operation, 0 on success, otherwise error code
*/
Result SignalEvent(const Handle handle);
/**
* Clears an event
* @param handle Handle to event to clear

5
src/core/hle/kernel/mutex.cpp
View File

@@ -46,6 +46,11 @@ public:
Result WaitSynchronization(bool* wait) {
// TODO(bunnei): ImplementMe
*wait = locked;
if (locked) {
Kernel::WaitCurrentThread(WAITTYPE_MUTEX);
}
return 0;
}
};

121
src/core/hle/kernel/thread.cpp
View File

@@ -5,6 +5,7 @@
#include <stdio.h>
#include <list>
#include <algorithm>
#include <vector>
#include <map>
#include <string>
@@ -52,7 +53,14 @@ public:
* @return Result of operation, 0 on success, otherwise error code
*/
Result WaitSynchronization(bool* wait) {
// TODO(bunnei): ImplementMe
if (status != THREADSTATUS_DORMANT) {
Handle thread = GetCurrentThreadHandle();
if (std::find(waiting_threads.begin(), waiting_threads.end(), thread) == waiting_threads.end()) {
waiting_threads.push_back(thread);
}
WaitCurrentThread(WAITTYPE_THREADEND, this->GetHandle());
*wait = true;
}
return 0;
}
@@ -69,6 +77,9 @@ public:
s32 processor_id;
WaitType wait_type;
Handle wait_handle;
std::vector<Handle> waiting_threads;
char name[Kernel::MAX_NAME_LENGTH + 1];
};
@@ -82,7 +93,6 @@ Common::ThreadQueueList<Handle> g_thread_ready_queue;
Handle g_current_thread_handle;
Thread* g_current_thread;
/// Gets the current thread
inline Thread* GetCurrentThread() {
return g_current_thread;
@@ -114,15 +124,15 @@ void ResetThread(Thread* t, u32 arg, s32 lowest_priority) {
memset(&t->context, 0, sizeof(ThreadContext));
t->context.cpu_registers[0] = arg;
t->context.pc = t->entry_point;
t->context.pc = t->context.cpu_registers[15] = t->entry_point;
t->context.sp = t->stack_top;
t->context.cpsr = 0x1F; // Usermode
if (t->current_priority < lowest_priority) {
t->current_priority = t->initial_priority;
}
t->wait_type = WAITTYPE_NONE;
t->wait_handle = 0;
}
/// Change a thread to "ready" state
@@ -142,6 +152,43 @@ void ChangeReadyState(Thread* t, bool ready) {
}
}
/// Verify that a thread has not been released from waiting
inline bool VerifyWait(const Handle& thread, WaitType type, Handle handle) {
Handle wait_id = 0;
Thread *t = g_object_pool.GetFast<Thread>(thread);
if (t) {
if (type == t->wait_type && handle == t->wait_handle) {
return true;
}
} else {
ERROR_LOG(KERNEL, "thread 0x%08X does not exist", thread);
}
return false;
}
/// Stops the current thread
void StopThread(Handle thread, const char* reason) {
u32 error;
Thread *t = g_object_pool.Get<Thread>(thread, error);
if (t) {
ChangeReadyState(t, false);
t->status = THREADSTATUS_DORMANT;
for (size_t i = 0; i < t->waiting_threads.size(); ++i) {
const Handle waiting_thread = t->waiting_threads[i];
if (VerifyWait(waiting_thread, WAITTYPE_THREADEND, thread)) {
ResumeThreadFromWait(waiting_thread);
}
}
t->waiting_threads.clear();
// Stopped threads are never waiting.
t->wait_type = WAITTYPE_NONE;
t->wait_handle = 0;
} else {
ERROR_LOG(KERNEL, "thread 0x%08X does not exist", thread);
}
}
/// Changes a threads state
void ChangeThreadState(Thread* t, ThreadStatus new_status) {
if (!t || t->status == new_status) {
@@ -152,7 +199,7 @@ void ChangeThreadState(Thread* t, ThreadStatus new_status) {
if (new_status == THREADSTATUS_WAIT) {
if (t->wait_type == WAITTYPE_NONE) {
printf("ERROR: Waittype none not allowed here\n");
ERROR_LOG(KERNEL, "Waittype none not allowed");
}
}
}
@@ -207,9 +254,10 @@ Thread* NextThread() {
}
/// Puts the current thread in the wait state for the given type
void WaitCurrentThread(WaitType wait_type) {
void WaitCurrentThread(WaitType wait_type, Handle wait_handle) {
Thread* t = GetCurrentThread();
t->wait_type = wait_type;
t->wait_handle = wait_handle;
ChangeThreadState(t, ThreadStatus(THREADSTATUS_WAIT | (t->status & THREADSTATUS_SUSPEND)));
}
@@ -225,6 +273,22 @@ void ResumeThreadFromWait(Handle handle) {
}
}
/// Prints the thread queue for debugging purposes
void DebugThreadQueue() {
Thread* thread = GetCurrentThread();
if (!thread) {
return;
}
INFO_LOG(KERNEL, "0x%02X 0x%08X (current)", thread->current_priority, GetCurrentThreadHandle());
for (u32 i = 0; i < g_thread_queue.size(); i++) {
Handle handle = g_thread_queue[i];
s32 priority = g_thread_ready_queue.contains(handle);
if (priority != -1) {
INFO_LOG(KERNEL, "0x%02X 0x%08X", priority, handle);
}
}
}
/// Creates a new thread
Thread* CreateThread(Handle& handle, const char* name, u32 entry_point, s32 priority,
s32 processor_id, u32 stack_top, int stack_size) {
@@ -233,12 +297,12 @@ Thread* CreateThread(Handle& handle, const char* name, u32 entry_point, s32 prio
"CreateThread priority=%d, outside of allowable range!", priority)
Thread* t = new Thread;
handle = Kernel::g_object_pool.Create(t);
g_thread_queue.push_back(handle);
g_thread_ready_queue.prepare(priority);
t->status = THREADSTATUS_DORMANT;
t->entry_point = entry_point;
t->stack_top = stack_top;
@@ -246,16 +310,18 @@ Thread* CreateThread(Handle& handle, const char* name, u32 entry_point, s32 prio
t->initial_priority = t->current_priority = priority;
t->processor_id = processor_id;
t->wait_type = WAITTYPE_NONE;
t->wait_handle = 0;
strncpy(t->name, name, Kernel::MAX_NAME_LENGTH);
t->name[Kernel::MAX_NAME_LENGTH] = '\0';
return t;
}
/// Creates a new thread - wrapper for external user
Handle CreateThread(const char* name, u32 entry_point, s32 priority, u32 arg, s32 processor_id,
u32 stack_top, int stack_size) {
if (name == NULL) {
ERROR_LOG(KERNEL, "CreateThread(): NULL name");
return -1;
@@ -289,7 +355,7 @@ Handle CreateThread(const char* name, u32 entry_point, s32 priority, u32 arg, s3
// This won't schedule to the new thread, but it may to one woken from eating cycles.
// Technically, this should not eat all at once, and reschedule in the middle, but that's hard.
//HLE::Reschedule("thread created");
//HLE::Reschedule(__func__);
return handle;
}
@@ -363,35 +429,24 @@ Handle SetupMainThread(s32 priority, int stack_size) {
return handle;
}
/// Reschedules to the next available thread (call after current thread is suspended)
void Reschedule() {
Thread* prev = GetCurrentThread();
Thread* next = NextThread();
HLE::g_reschedule = false;
if (next > 0) {
INFO_LOG(KERNEL, "context switch 0x%08X -> 0x%08X", prev->GetHandle(), next->GetHandle());
SwitchContext(next);
// Hack - automatically change previous thread (which would have been in "wait" state) to
// "ready" state, so that we can immediately resume to it when new thread yields. FixMe to
// actually wait for whatever event it is supposed to be waiting on.
ChangeReadyState(prev, true);
} else {
INFO_LOG(KERNEL, "no ready threads, staying on 0x%08X", prev->GetHandle());
// Hack - no other threads are available, so decrement current PC to the last instruction,
// and then resume current thread. This should always be called on a blocking instruction
// (e.g. svcWaitSynchronization), and the result should be that the instruction is repeated
// until it no longer blocks.
// TODO(bunnei): A better solution: Have the CPU switch to an idle thread
ThreadContext ctx;
SaveContext(ctx);
ctx.pc -= 4;
LoadContext(ctx);
ChangeReadyState(prev, true);
// Hack - There is no mechanism yet to waken the primary thread if it has been put to sleep
// by a simulated VBLANK thread switch. So, we'll just immediately set it to "ready" again.
// This results in the current thread yielding on a VBLANK once, and then it will be
// immediately placed back in the queue for execution.
if (prev->wait_type == WAITTYPE_VBLANK) {
ResumeThreadFromWait(prev->GetHandle());
}
}
}

9
src/core/hle/kernel/thread.h
View File

@@ -34,7 +34,7 @@ enum WaitType {
WAITTYPE_NONE,
WAITTYPE_SLEEP,
WAITTYPE_SEMA,
WAITTYPE_EVENTFLAG,
WAITTYPE_EVENT,
WAITTYPE_THREADEND,
WAITTYPE_VBLANK,
WAITTYPE_MUTEX,
@@ -53,8 +53,8 @@ Handle SetupMainThread(s32 priority, int stack_size=Kernel::DEFAULT_STACK_SIZE);
/// Reschedules to the next available thread (call after current thread is suspended)
void Reschedule();
/// Puts the current thread in the wait state for the given type
void WaitCurrentThread(WaitType wait_type);
/// Stops the current thread
void StopThread(Handle thread, const char* reason);
/// Resumes a thread from waiting by marking it as "ready"
void ResumeThreadFromWait(Handle handle);
@@ -62,6 +62,9 @@ void ResumeThreadFromWait(Handle handle);
/// Gets the current thread handle
Handle GetCurrentThreadHandle();
/// Puts the current thread in the wait state for the given type
void WaitCurrentThread(WaitType wait_type, Handle wait_handle=GetCurrentThreadHandle());
/// Put current thread in a wait state - on WaitSynchronization
void WaitThread_Synchronization();