293 lines
9 KiB
C++
293 lines
9 KiB
C++
// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#include <algorithm>
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#include <mutex>
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#include <string>
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#include <tuple>
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#include "common/logging/log.h"
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#include "common/microprofile.h"
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#include "common/thread.h"
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#include "core/core_timing.h"
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#include "core/core_timing_util.h"
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#include "core/hardware_properties.h"
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namespace Core::Timing {
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constexpr s64 MAX_SLICE_LENGTH = 4000;
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std::shared_ptr<EventType> CreateEvent(std::string name, TimedCallback&& callback) {
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return std::make_shared<EventType>(std::move(callback), std::move(name));
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}
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struct CoreTiming::Event {
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u64 time;
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u64 fifo_order;
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std::uintptr_t user_data;
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std::weak_ptr<EventType> type;
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// Sort by time, unless the times are the same, in which case sort by
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// the order added to the queue
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friend bool operator>(const Event& left, const Event& right) {
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return std::tie(left.time, left.fifo_order) > std::tie(right.time, right.fifo_order);
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}
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friend bool operator<(const Event& left, const Event& right) {
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return std::tie(left.time, left.fifo_order) < std::tie(right.time, right.fifo_order);
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}
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};
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CoreTiming::CoreTiming()
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: clock{Common::CreateBestMatchingClock(Hardware::BASE_CLOCK_RATE, Hardware::CNTFREQ)} {}
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CoreTiming::~CoreTiming() = default;
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void CoreTiming::ThreadEntry(CoreTiming& instance, size_t id) {
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const std::string name = "yuzu:HostTiming_" + std::to_string(id);
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MicroProfileOnThreadCreate(name.c_str());
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Common::SetCurrentThreadName(name.c_str());
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Common::SetCurrentThreadPriority(Common::ThreadPriority::Critical);
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instance.on_thread_init();
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instance.ThreadLoop();
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MicroProfileOnThreadExit();
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}
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void CoreTiming::Initialize(std::function<void()>&& on_thread_init_) {
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on_thread_init = std::move(on_thread_init_);
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event_fifo_id = 0;
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shutting_down = false;
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ticks = 0;
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const auto empty_timed_callback = [](std::uintptr_t, std::chrono::nanoseconds) {};
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ev_lost = CreateEvent("_lost_event", empty_timed_callback);
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if (is_multicore) {
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worker_threads.emplace_back(ThreadEntry, std::ref(*this), 0);
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}
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}
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void CoreTiming::Shutdown() {
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is_paused = true;
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shutting_down = true;
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std::atomic_thread_fence(std::memory_order_release);
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event_cv.notify_all();
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wait_pause_cv.notify_all();
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for (auto& thread : worker_threads) {
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thread.join();
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}
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worker_threads.clear();
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ClearPendingEvents();
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has_started = false;
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}
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void CoreTiming::Pause(bool is_paused_) {
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std::unique_lock main_lock(event_mutex);
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if (is_paused_ == paused_state.load(std::memory_order_relaxed)) {
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return;
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}
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if (is_multicore) {
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is_paused = is_paused_;
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event_cv.notify_all();
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if (!is_paused_) {
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wait_pause_cv.notify_all();
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}
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}
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paused_state.store(is_paused_, std::memory_order_relaxed);
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}
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void CoreTiming::SyncPause(bool is_paused_) {
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std::unique_lock main_lock(event_mutex);
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if (is_paused_ == paused_state.load(std::memory_order_relaxed)) {
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return;
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}
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if (is_multicore) {
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is_paused = is_paused_;
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event_cv.notify_all();
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if (!is_paused_) {
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wait_pause_cv.notify_all();
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}
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}
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paused_state.store(is_paused_, std::memory_order_relaxed);
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if (is_multicore) {
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if (is_paused_) {
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wait_signal_cv.wait(main_lock, [this] { return pause_count == worker_threads.size(); });
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} else {
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wait_signal_cv.wait(main_lock, [this] { return pause_count == 0; });
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}
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}
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}
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bool CoreTiming::IsRunning() const {
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return !paused_state.load(std::memory_order_acquire);
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}
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bool CoreTiming::HasPendingEvents() const {
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std::unique_lock main_lock(event_mutex);
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return !event_queue.empty() || pending_events.load(std::memory_order_relaxed) != 0;
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}
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void CoreTiming::ScheduleEvent(std::chrono::nanoseconds ns_into_future,
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const std::shared_ptr<EventType>& event_type,
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std::uintptr_t user_data) {
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std::unique_lock main_lock(event_mutex);
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const u64 timeout = static_cast<u64>((GetGlobalTimeNs() + ns_into_future).count());
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event_queue.emplace_back(Event{timeout, event_fifo_id++, user_data, event_type});
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pending_events.fetch_add(1, std::memory_order_relaxed);
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std::push_heap(event_queue.begin(), event_queue.end(), std::greater<>());
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if (is_multicore) {
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event_cv.notify_one();
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}
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}
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void CoreTiming::UnscheduleEvent(const std::shared_ptr<EventType>& event_type,
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std::uintptr_t user_data) {
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std::unique_lock main_lock(event_mutex);
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const auto itr = std::remove_if(event_queue.begin(), event_queue.end(), [&](const Event& e) {
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return e.type.lock().get() == event_type.get() && e.user_data == user_data;
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});
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// Removing random items breaks the invariant so we have to re-establish it.
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if (itr != event_queue.end()) {
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event_queue.erase(itr, event_queue.end());
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std::make_heap(event_queue.begin(), event_queue.end(), std::greater<>());
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pending_events.fetch_sub(1, std::memory_order_relaxed);
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}
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}
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void CoreTiming::AddTicks(u64 ticks_to_add) {
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ticks += ticks_to_add;
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downcount -= static_cast<s64>(ticks);
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}
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void CoreTiming::Idle() {
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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) {
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ticks = next_ticks;
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}
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return;
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}
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ticks += 1000U;
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}
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void CoreTiming::ResetTicks() {
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downcount = MAX_SLICE_LENGTH;
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}
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u64 CoreTiming::GetCPUTicks() const {
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if (is_multicore) {
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return clock->GetCPUCycles();
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}
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return ticks;
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}
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u64 CoreTiming::GetClockTicks() const {
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if (is_multicore) {
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return clock->GetClockCycles();
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}
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return CpuCyclesToClockCycles(ticks);
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}
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void CoreTiming::ClearPendingEvents() {
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std::unique_lock main_lock(event_mutex);
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event_queue.clear();
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}
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void CoreTiming::RemoveEvent(const std::shared_ptr<EventType>& event_type) {
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std::unique_lock main_lock(event_mutex);
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const auto itr = std::remove_if(event_queue.begin(), event_queue.end(), [&](const Event& e) {
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return e.type.lock().get() == event_type.get();
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});
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// Removing random items breaks the invariant so we have to re-establish it.
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if (itr != event_queue.end()) {
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event_queue.erase(itr, event_queue.end());
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std::make_heap(event_queue.begin(), event_queue.end(), std::greater<>());
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}
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}
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std::optional<s64> CoreTiming::Advance() {
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global_timer = GetGlobalTimeNs().count();
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std::unique_lock main_lock(event_mutex);
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while (!event_queue.empty() && event_queue.front().time <= global_timer) {
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Event evt = std::move(event_queue.front());
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std::pop_heap(event_queue.begin(), event_queue.end(), std::greater<>());
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event_queue.pop_back();
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if (const auto event_type{evt.type.lock()}) {
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event_mutex.unlock();
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const s64 delay = static_cast<s64>(GetGlobalTimeNs().count() - evt.time);
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event_type->callback(evt.user_data, std::chrono::nanoseconds{delay});
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event_mutex.lock();
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pending_events.fetch_sub(1, std::memory_order_relaxed);
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}
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global_timer = GetGlobalTimeNs().count();
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}
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if (!event_queue.empty()) {
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const s64 next_time = event_queue.front().time - global_timer;
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return next_time;
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} else {
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return std::nullopt;
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}
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}
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void CoreTiming::ThreadLoop() {
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const auto predicate = [this] { return !event_queue.empty() || is_paused; };
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has_started = true;
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while (!shutting_down) {
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while (!is_paused && !shutting_down) {
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const auto next_time = Advance();
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if (next_time) {
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if (*next_time > 0) {
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std::chrono::nanoseconds next_time_ns = std::chrono::nanoseconds(*next_time);
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std::unique_lock main_lock(event_mutex);
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event_cv.wait_for(main_lock, next_time_ns, predicate);
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}
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} else {
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std::unique_lock main_lock(event_mutex);
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event_cv.wait(main_lock, predicate);
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}
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}
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std::unique_lock main_lock(event_mutex);
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pause_count++;
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if (pause_count == worker_threads.size()) {
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clock->Pause(true);
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wait_signal_cv.notify_all();
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}
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wait_pause_cv.wait(main_lock, [this] { return !is_paused || shutting_down; });
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pause_count--;
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if (pause_count == 0) {
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clock->Pause(false);
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wait_signal_cv.notify_all();
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}
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}
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}
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std::chrono::nanoseconds CoreTiming::GetGlobalTimeNs() const {
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if (is_multicore) {
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return clock->GetTimeNS();
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}
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return CyclesToNs(ticks);
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}
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std::chrono::microseconds CoreTiming::GetGlobalTimeUs() const {
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if (is_multicore) {
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return clock->GetTimeUS();
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}
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return CyclesToUs(ticks);
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}
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} // namespace Core::Timing
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