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110 lines
3 KiB
C++
110 lines
3 KiB
C++
// Copyright 2013 Dolphin Emulator Project / 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <condition_variable>
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#include <cstddef>
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#include <mutex>
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#include <thread>
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#include "common/common_types.h"
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// Support for C++11's thread_local keyword was surprisingly spotty in compilers until very
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// recently. Fortunately, thread local variables have been well supported for compilers for a while,
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// but with semantics supporting only POD types, so we can use a few defines to get some amount of
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// backwards compat support.
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// WARNING: This only works correctly with POD types.
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#if defined(__clang__)
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#if !__has_feature(cxx_thread_local)
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#define thread_local __thread
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#endif
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#elif defined(__GNUC__)
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#if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8)
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#define thread_local __thread
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#endif
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#elif defined(_MSC_VER)
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#if _MSC_VER < 1900
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#define thread_local __declspec(thread)
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#endif
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#endif
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namespace Common {
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int CurrentThreadId();
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void SetThreadAffinity(std::thread::native_handle_type thread, u32 mask);
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void SetCurrentThreadAffinity(u32 mask);
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class Event {
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public:
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Event() : is_set(false) {}
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void Set() {
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std::lock_guard<std::mutex> lk(mutex);
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if (!is_set) {
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is_set = true;
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condvar.notify_one();
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}
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}
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void Wait() {
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std::unique_lock<std::mutex> lk(mutex);
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condvar.wait(lk, [&] { return is_set; });
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is_set = false;
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}
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void Reset() {
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std::unique_lock<std::mutex> lk(mutex);
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// no other action required, since wait loops on the predicate and any lingering signal will
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// get cleared on the first iteration
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is_set = false;
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}
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private:
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bool is_set;
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std::condition_variable condvar;
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std::mutex mutex;
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};
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class Barrier {
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public:
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explicit Barrier(size_t count_) : count(count_), waiting(0), generation(0) {}
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/// Blocks until all "count" threads have called Sync()
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void Sync() {
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std::unique_lock<std::mutex> lk(mutex);
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const size_t current_generation = generation;
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if (++waiting == count) {
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generation++;
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waiting = 0;
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condvar.notify_all();
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} else {
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condvar.wait(lk,
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[this, current_generation] { return current_generation != generation; });
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}
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}
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private:
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std::condition_variable condvar;
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std::mutex mutex;
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const size_t count;
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size_t waiting;
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size_t generation; // Incremented once each time the barrier is used
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};
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void SleepCurrentThread(int ms);
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void SwitchCurrentThread(); // On Linux, this is equal to sleep 1ms
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// Use this function during a spin-wait to make the current thread
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// relax while another thread is working. This may be more efficient
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// than using events because event functions use kernel calls.
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inline void YieldCPU() {
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std::this_thread::yield();
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}
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void SetCurrentThreadName(const char* name);
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} // namespace Common
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