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Core_Timing: Make core_timing threadsafe by default. 

The old implementation had faulty Threadsafe methods where events could
be missing. This implementation unifies unsafe/safe methods and makes
core timing thread safe overall.
This commit is contained in:
Fernando Sahmkow 2019-06-15 10:12:41 -04:00 committed by FernandoS27
parent 7e2bcf04b4
commit 90792cdb6e
5 changed files with 25 additions and 60 deletions
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2
src/audio_core/stream.cpp
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@ -101,7 +101,7 @@ void Stream::PlayNextBuffer() {
sink_stream.EnqueueSamples(GetNumChannels(), active_buffer->GetSamples());
core_timing.ScheduleEventThreadsafe(GetBufferReleaseCycles(*active_buffer), release_event, {});
core_timing.ScheduleEvent(GetBufferReleaseCycles(*active_buffer), release_event, {});
}
void Stream::ReleaseActiveBuffer() {

34
src/core/core_timing.cpp
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@ -56,12 +56,12 @@ void CoreTiming::Initialize() {
}
void CoreTiming::Shutdown() {
MoveEvents();
ClearPendingEvents();
UnregisterAllEvents();
}
EventType* CoreTiming::RegisterEvent(const std::string& name, TimedCallback callback) {
std::lock_guard guard{inner_mutex};
// check for existing type with same name.
// we want event type names to remain unique so that we can use them for serialization.
ASSERT_MSG(event_types.find(name) == event_types.end(),
@ -82,6 +82,7 @@ void CoreTiming::UnregisterAllEvents() {
void CoreTiming::ScheduleEvent(s64 cycles_into_future, const EventType* event_type, u64 userdata) {
ASSERT(event_type != nullptr);
std::lock_guard guard{inner_mutex};
const s64 timeout = GetTicks() + cycles_into_future;
// If this event needs to be scheduled before the next advance(), force one early
@ -93,12 +94,8 @@ void CoreTiming::ScheduleEvent(s64 cycles_into_future, const EventType* event_ty
std::push_heap(event_queue.begin(), event_queue.end(), std::greater<>());
}
void CoreTiming::ScheduleEventThreadsafe(s64 cycles_into_future, const EventType* event_type,
u64 userdata) {
ts_queue.Push(Event{global_timer + cycles_into_future, 0, userdata, event_type});
}
void CoreTiming::UnscheduleEvent(const EventType* event_type, u64 userdata) {
std::lock_guard guard{inner_mutex};
const auto itr = std::remove_if(event_queue.begin(), event_queue.end(), [&](const Event& e) {
return e.type == event_type && e.userdata == userdata;
});
@ -110,10 +107,6 @@ void CoreTiming::UnscheduleEvent(const EventType* event_type, u64 userdata) {
}
}
void CoreTiming::UnscheduleEventThreadsafe(const EventType* event_type, u64 userdata) {
unschedule_queue.Push(std::make_pair(event_type, userdata));
}
u64 CoreTiming::GetTicks() const {
u64 ticks = static_cast<u64>(global_timer);
if (!is_global_timer_sane) {
@ -135,6 +128,7 @@ void CoreTiming::ClearPendingEvents() {
}
void CoreTiming::RemoveEvent(const EventType* event_type) {
std::lock_guard guard{inner_mutex};
const auto itr = std::remove_if(event_queue.begin(), event_queue.end(),
[&](const Event& e) { return e.type == event_type; });
@ -145,11 +139,6 @@ void CoreTiming::RemoveEvent(const EventType* event_type) {
}
}
void CoreTiming::RemoveNormalAndThreadsafeEvent(const EventType* event_type) {
MoveEvents();
RemoveEvent(event_type);
}
void CoreTiming::ForceExceptionCheck(s64 cycles) {
cycles = std::max<s64>(0, cycles);
if (downcount <= cycles) {
@ -162,19 +151,8 @@ void CoreTiming::ForceExceptionCheck(s64 cycles) {
downcount = static_cast<int>(cycles);
}
void CoreTiming::MoveEvents() {
for (Event ev; ts_queue.Pop(ev);) {
ev.fifo_order = event_fifo_id++;
event_queue.emplace_back(std::move(ev));
std::push_heap(event_queue.begin(), event_queue.end(), std::greater<>());
}
}
void CoreTiming::Advance() {
MoveEvents();
for (std::pair<const EventType*, u64> ev; unschedule_queue.Pop(ev);) {
UnscheduleEvent(ev.first, ev.second);
}
std::unique_lock<std::mutex> guard(inner_mutex);
const int cycles_executed = slice_length - downcount;
global_timer += cycles_executed;
@ -186,7 +164,9 @@ void CoreTiming::Advance() {
Event evt = std::move(event_queue.front());
std::pop_heap(event_queue.begin(), event_queue.end(), std::greater<>());
event_queue.pop_back();
inner_mutex.unlock();
evt.type->callback(evt.userdata, global_timer - evt.time);
inner_mutex.lock();
}
is_global_timer_sane = false;

23
src/core/core_timing.h
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@ -6,6 +6,7 @@
#include <chrono>
#include <functional>
#include <mutex>
#include <string>
#include <unordered_map>
#include <vector>
@ -67,7 +68,7 @@ public:
///
EventType* RegisterEvent(const std::string& name, TimedCallback callback);
/// Unregisters all registered events thus far.
/// Unregisters all registered events thus far. Note: not thread unsafe
void UnregisterAllEvents();
/// After the first Advance, the slice lengths and the downcount will be reduced whenever an
@ -76,20 +77,10 @@ public:
/// Scheduling from a callback will not update the downcount until the Advance() completes.
void ScheduleEvent(s64 cycles_into_future, const EventType* event_type, u64 userdata = 0);
/// This is to be called when outside of hle threads, such as the graphics thread, wants to
/// schedule things to be executed on the main thread.
///
/// @note This doesn't change slice_length and thus events scheduled by this might be
/// called with a delay of up to MAX_SLICE_LENGTH
void ScheduleEventThreadsafe(s64 cycles_into_future, const EventType* event_type,
u64 userdata = 0);
void UnscheduleEvent(const EventType* event_type, u64 userdata);
void UnscheduleEventThreadsafe(const EventType* event_type, u64 userdata);
/// We only permit one event of each type in the queue at a time.
void RemoveEvent(const EventType* event_type);
void RemoveNormalAndThreadsafeEvent(const EventType* event_type);
void ForceExceptionCheck(s64 cycles);
@ -120,7 +111,6 @@ private:
/// Clear all pending events. This should ONLY be done on exit.
void ClearPendingEvents();
void MoveEvents();
s64 global_timer = 0;
s64 idled_cycles = 0;
@ -143,14 +133,9 @@ private:
// remain stable regardless of rehashes/resizing.
std::unordered_map<std::string, EventType> event_types;
// The queue for storing the events from other threads threadsafe until they will be added
// to the event_queue by the emu thread
Common::MPSCQueue<Event> ts_queue;
// The queue for unscheduling the events from other threads threadsafe
Common::MPSCQueue<std::pair<const EventType*, u64>> unschedule_queue;
EventType* ev_lost = nullptr;
std::mutex inner_mutex;
};
} // namespace Core::Timing

6
src/core/hle/kernel/thread.cpp
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@ -76,13 +76,13 @@ void Thread::WakeAfterDelay(s64 nanoseconds) {
// This function might be called from any thread so we have to be cautious and use the
// thread-safe version of ScheduleEvent.
const s64 cycles = Core::Timing::nsToCycles(std::chrono::nanoseconds{nanoseconds});
Core::System::GetInstance().CoreTiming().ScheduleEventThreadsafe(
Core::System::GetInstance().CoreTiming().ScheduleEvent(
cycles, kernel.ThreadWakeupCallbackEventType(), callback_handle);
}
void Thread::CancelWakeupTimer() {
Core::System::GetInstance().CoreTiming().UnscheduleEventThreadsafe(
kernel.ThreadWakeupCallbackEventType(), callback_handle);
Core::System::GetInstance().CoreTiming().UnscheduleEvent(kernel.ThreadWakeupCallbackEventType(),
callback_handle);
}
static std::optional<s32> GetNextProcessorId(u64 mask) {

20
src/tests/core/core_timing.cpp
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@ -99,24 +99,24 @@ TEST_CASE("CoreTiming[Threadsave]", "[core]") {
core_timing.Advance();
// D -> B -> C -> A -> E
core_timing.ScheduleEventThreadsafe(1000, cb_a, CB_IDS[0]);
// Manually force since ScheduleEventThreadsafe doesn't call it
core_timing.ScheduleEvent(1000, cb_a, CB_IDS[0]);
// Manually force since ScheduleEvent doesn't call it
core_timing.ForceExceptionCheck(1000);
REQUIRE(1000 == core_timing.GetDowncount());
core_timing.ScheduleEventThreadsafe(500, cb_b, CB_IDS[1]);
// Manually force since ScheduleEventThreadsafe doesn't call it
core_timing.ScheduleEvent(500, cb_b, CB_IDS[1]);
// Manually force since ScheduleEvent doesn't call it
core_timing.ForceExceptionCheck(500);
REQUIRE(500 == core_timing.GetDowncount());
core_timing.ScheduleEventThreadsafe(800, cb_c, CB_IDS[2]);
// Manually force since ScheduleEventThreadsafe doesn't call it
core_timing.ScheduleEvent(800, cb_c, CB_IDS[2]);
// Manually force since ScheduleEvent doesn't call it
core_timing.ForceExceptionCheck(800);
REQUIRE(500 == core_timing.GetDowncount());
core_timing.ScheduleEventThreadsafe(100, cb_d, CB_IDS[3]);
// Manually force since ScheduleEventThreadsafe doesn't call it
core_timing.ScheduleEvent(100, cb_d, CB_IDS[3]);
// Manually force since ScheduleEvent doesn't call it
core_timing.ForceExceptionCheck(100);
REQUIRE(100 == core_timing.GetDowncount());
core_timing.ScheduleEventThreadsafe(1200, cb_e, CB_IDS[4]);
// Manually force since ScheduleEventThreadsafe doesn't call it
core_timing.ScheduleEvent(1200, cb_e, CB_IDS[4]);
// Manually force since ScheduleEvent doesn't call it
core_timing.ForceExceptionCheck(1200);
REQUIRE(100 == core_timing.GetDowncount());