yuzu/src/core/core_timing.cpp

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// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include <algorithm>
#include <mutex>
#include <string>
#include <tuple>
#include "common/microprofile.h"
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#include "common/thread.h"
#include "core/core_timing.h"
#include "core/core_timing_util.h"
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#include "core/hardware_properties.h"
namespace Core::Timing {
constexpr s64 MAX_SLICE_LENGTH = 4000;
std::shared_ptr<EventType> CreateEvent(std::string name, TimedCallback&& callback) {
return std::make_shared<EventType>(std::move(callback), std::move(name));
}
struct CoreTiming::Event {
u64 time;
u64 fifo_order;
std::uintptr_t user_data;
std::weak_ptr<EventType> type;
// Sort by time, unless the times are the same, in which case sort by
// the order added to the queue
friend bool operator>(const Event& left, const Event& right) {
return std::tie(left.time, left.fifo_order) > std::tie(right.time, right.fifo_order);
}
friend bool operator<(const Event& left, const Event& right) {
return std::tie(left.time, left.fifo_order) < std::tie(right.time, right.fifo_order);
}
};
CoreTiming::CoreTiming()
: clock{Common::CreateBestMatchingClock(Hardware::BASE_CLOCK_RATE, Hardware::CNTFREQ)} {}
CoreTiming::~CoreTiming() = default;
void CoreTiming::ThreadEntry(CoreTiming& instance) {
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constexpr char name[] = "yuzu:HostTiming";
MicroProfileOnThreadCreate(name);
Common::SetCurrentThreadName(name);
Common::SetCurrentThreadPriority(Common::ThreadPriority::Critical);
instance.on_thread_init();
instance.ThreadLoop();
MicroProfileOnThreadExit();
}
void CoreTiming::Initialize(std::function<void()>&& on_thread_init_) {
on_thread_init = std::move(on_thread_init_);
event_fifo_id = 0;
shutting_down = false;
ticks = 0;
const auto empty_timed_callback = [](std::uintptr_t, std::chrono::nanoseconds) {};
ev_lost = CreateEvent("_lost_event", empty_timed_callback);
if (is_multicore) {
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const auto hardware_concurrency = std::thread::hardware_concurrency();
worker_threads.emplace_back(ThreadEntry, std::ref(*this));
if (hardware_concurrency > 8) {
worker_threads.emplace_back(ThreadEntry, std::ref(*this));
}
}
}
void CoreTiming::Shutdown() {
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is_paused = true;
shutting_down = true;
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{
std::unique_lock<std::mutex> main_lock(event_mutex);
event_cv.notify_all();
wait_pause_cv.notify_all();
}
for (auto& thread : worker_threads) {
thread.join();
}
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worker_threads.clear();
ClearPendingEvents();
has_started = false;
}
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void CoreTiming::Pause(bool is_paused_) {
std::unique_lock<std::mutex> main_lock(event_mutex);
if (is_paused_ == paused_state.load(std::memory_order_relaxed)) {
return;
}
if (is_multicore) {
is_paused = is_paused_;
event_cv.notify_all();
if (!is_paused_) {
wait_pause_cv.notify_all();
}
}
paused_state.store(is_paused_, std::memory_order_relaxed);
}
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void CoreTiming::SyncPause(bool is_paused_) {
std::unique_lock<std::mutex> main_lock(event_mutex);
if (is_paused_ == paused_state.load(std::memory_order_relaxed)) {
return;
}
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if (is_multicore) {
is_paused = is_paused_;
event_cv.notify_all();
if (!is_paused_) {
wait_pause_cv.notify_all();
}
}
paused_state.store(is_paused_, std::memory_order_relaxed);
if (is_multicore) {
if (is_paused_) {
wait_signal_cv.wait(main_lock, [this] { return pause_count == worker_threads.size(); });
} else {
wait_signal_cv.wait(main_lock, [this] { return pause_count == 0; });
}
}
}
bool CoreTiming::IsRunning() const {
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return !paused_state.load(std::memory_order_acquire);
}
bool CoreTiming::HasPendingEvents() const {
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std::unique_lock<std::mutex> main_lock(event_mutex);
return !event_queue.empty();
}
void CoreTiming::ScheduleEvent(std::chrono::nanoseconds ns_into_future,
const std::shared_ptr<EventType>& event_type,
std::uintptr_t user_data) {
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std::unique_lock<std::mutex> main_lock(event_mutex);
const u64 timeout = static_cast<u64>((GetGlobalTimeNs() + ns_into_future).count());
event_queue.emplace_back(Event{timeout, event_fifo_id++, user_data, event_type});
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std::push_heap(event_queue.begin(), event_queue.end(), std::greater<>());
if (is_multicore) {
event_cv.notify_one();
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}
}
void CoreTiming::UnscheduleEvent(const std::shared_ptr<EventType>& event_type,
std::uintptr_t user_data) {
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std::unique_lock<std::mutex> main_lock(event_mutex);
const auto itr = std::remove_if(event_queue.begin(), event_queue.end(), [&](const Event& e) {
return e.type.lock().get() == event_type.get() && e.user_data == user_data;
});
// Removing random items breaks the invariant so we have to re-establish it.
if (itr != event_queue.end()) {
event_queue.erase(itr, event_queue.end());
std::make_heap(event_queue.begin(), event_queue.end(), std::greater<>());
}
}
void CoreTiming::AddTicks(u64 ticks_to_add) {
ticks += ticks_to_add;
downcount -= static_cast<s64>(ticks);
}
void CoreTiming::Idle() {
if (!event_queue.empty()) {
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const u64 next_event_time = event_queue.front().time;
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const u64 next_ticks = nsToCycles(std::chrono::nanoseconds(next_event_time)) + 10U;
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if (next_ticks > ticks) {
ticks = next_ticks;
}
return;
}
ticks += 1000U;
}
void CoreTiming::ResetTicks() {
downcount = MAX_SLICE_LENGTH;
}
u64 CoreTiming::GetCPUTicks() const {
if (is_multicore) {
return clock->GetCPUCycles();
}
return ticks;
}
u64 CoreTiming::GetClockTicks() const {
if (is_multicore) {
return clock->GetClockCycles();
}
return CpuCyclesToClockCycles(ticks);
}
void CoreTiming::ClearPendingEvents() {
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std::unique_lock<std::mutex> main_lock(event_mutex);
event_queue.clear();
}
void CoreTiming::RemoveEvent(const std::shared_ptr<EventType>& event_type) {
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std::unique_lock<std::mutex> main_lock(event_mutex);
const auto itr = std::remove_if(event_queue.begin(), event_queue.end(), [&](const Event& e) {
return e.type.lock().get() == event_type.get();
});
// Removing random items breaks the invariant so we have to re-establish it.
if (itr != event_queue.end()) {
event_queue.erase(itr, event_queue.end());
std::make_heap(event_queue.begin(), event_queue.end(), std::greater<>());
}
}
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std::optional<s64> CoreTiming::Advance() {
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global_timer = GetGlobalTimeNs().count();
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std::unique_lock<std::mutex> main_lock(event_mutex);
while (!event_queue.empty() && event_queue.front().time <= global_timer) {
Event evt = std::move(event_queue.front());
std::pop_heap(event_queue.begin(), event_queue.end(), std::greater<>());
event_queue.pop_back();
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event_mutex.unlock();
if (const auto event_type{evt.type.lock()}) {
std::unique_lock<std::mutex> lk(event_type->guard);
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event_type->callback(evt.user_data, std::chrono::nanoseconds{static_cast<s64>(
GetGlobalTimeNs().count() - evt.time)});
}
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event_mutex.lock();
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global_timer = GetGlobalTimeNs().count();
}
if (!event_queue.empty()) {
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const s64 next_time = event_queue.front().time - global_timer;
return next_time;
} else {
return std::nullopt;
}
}
void CoreTiming::ThreadLoop() {
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const auto predicate = [this] { return !event_queue.empty() || is_paused; };
has_started = true;
while (!shutting_down) {
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while (!is_paused && !shutting_down) {
const auto next_time = Advance();
if (next_time) {
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if (*next_time > 0) {
std::chrono::nanoseconds next_time_ns = std::chrono::nanoseconds(*next_time);
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std::unique_lock<std::mutex> main_lock(event_mutex);
event_cv.wait_for(main_lock, next_time_ns, predicate);
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}
} else {
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std::unique_lock<std::mutex> main_lock(event_mutex);
event_cv.wait(main_lock, predicate);
}
}
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std::unique_lock<std::mutex> main_lock(event_mutex);
pause_count++;
if (pause_count == worker_threads.size()) {
clock->Pause(true);
wait_signal_cv.notify_all();
}
wait_pause_cv.wait(main_lock, [this] { return !is_paused || shutting_down; });
pause_count--;
if (pause_count == 0) {
clock->Pause(false);
wait_signal_cv.notify_all();
}
}
}
std::chrono::nanoseconds CoreTiming::GetGlobalTimeNs() const {
if (is_multicore) {
return clock->GetTimeNS();
}
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return CyclesToNs(ticks);
}
std::chrono::microseconds CoreTiming::GetGlobalTimeUs() const {
if (is_multicore) {
return clock->GetTimeUS();
}
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return CyclesToUs(ticks);
}
} // namespace Core::Timing