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core_timing: handle concurrent unscheduling of looping events

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This commit is contained in:
Liam
2023-12-23 14:20:10 -05:00
parent 575db04172
commit 05eda56e66
2 changed files with 15 additions and 4 deletions
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14
src/core/core_timing.cpp
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@@ -159,6 +159,8 @@ void CoreTiming::UnscheduleEvent(const std::shared_ptr<EventType>& event_type,
for (auto h : to_remove) {
event_queue.erase(h);
}
event_type->sequence_number++;
}
// Force any in-progress events to finish
@@ -202,9 +204,10 @@ std::optional<s64> CoreTiming::Advance() {
const Event& evt = event_queue.top();
if (const auto event_type{evt.type.lock()}) {
if (evt.reschedule_time == 0) {
const auto evt_time = evt.time;
const auto evt_time = evt.time;
const auto evt_sequence_num = event_type->sequence_number;
if (evt.reschedule_time == 0) {
event_queue.pop();
basic_lock.unlock();
@@ -217,10 +220,15 @@ std::optional<s64> CoreTiming::Advance() {
basic_lock.unlock();
const auto new_schedule_time{event_type->callback(
evt.time, std::chrono::nanoseconds{GetGlobalTimeNs().count() - evt.time})};
evt_time, std::chrono::nanoseconds{GetGlobalTimeNs().count() - evt_time})};
basic_lock.lock();
if (evt_sequence_num != event_type->sequence_number) {
// Heap handle is invalidated after external modification.
continue;
}
const auto next_schedule_time{new_schedule_time.has_value()
? new_schedule_time.value().count()
: evt.reschedule_time};

5
src/core/core_timing.h
View File

@@ -27,12 +27,15 @@ using TimedCallback = std::function<std::optional<std::chrono::nanoseconds>(
/// Contains the characteristics of a particular event.
struct EventType {
explicit EventType(TimedCallback&& callback_, std::string&& name_)
: callback{std::move(callback_)}, name{std::move(name_)} {}
: callback{std::move(callback_)}, name{std::move(name_)}, sequence_number{0} {}
/// The event's callback function.
TimedCallback callback;
/// A pointer to the name of the event.
const std::string name;
/// A monotonic sequence number, incremented when this event is
/// changed externally.
size_t sequence_number;
};
enum class UnscheduleEventType {