yuzu/src/common/thread.h

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// Copyright 2013 Dolphin Emulator Project / 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
// Don't include common.h here as it will break LogManager
#include "common/common_types.h"
#include <cstdio>
#include <cstring>
#include <thread>
#include <condition_variable>
#include <mutex>
// This may not be defined outside _WIN32
#ifndef _WIN32
#ifndef INFINITE
#define INFINITE 0xffffffff
#endif
//for gettimeofday and struct time(spec|val)
#include <time.h>
#include <sys/time.h>
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#include <unistd.h>
#endif
// Support for C++11's thread_local keyword was surprisingly spotty in compilers until very
// recently. Fortunately, thread local variables have been well supported for compilers for a while,
// but with semantics supporting only POD types, so we can use a few defines to get some amount of
// backwards compat support.
// WARNING: This only works correctly with POD types.
#if defined(__clang__)
# if !__has_feature(cxx_thread_local)
# define thread_local __thread
# endif
#elif defined(__GNUC__)
# if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 8)
# define thread_local __thread
# endif
#elif defined(_MSC_VER)
# if _MSC_VER < 1900
# define thread_local __declspec(thread)
# endif
#endif
namespace Common
{
int CurrentThreadId();
void SetThreadAffinity(std::thread::native_handle_type thread, u32 mask);
void SetCurrentThreadAffinity(u32 mask);
class Event
{
public:
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Event()
: is_set(false)
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{}
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void Set()
{
std::lock_guard<std::mutex> lk(m_mutex);
if (!is_set)
{
is_set = true;
m_condvar.notify_one();
}
}
void Wait()
{
std::unique_lock<std::mutex> lk(m_mutex);
m_condvar.wait(lk, IsSet(this));
is_set = false;
}
void Reset()
{
std::unique_lock<std::mutex> lk(m_mutex);
// no other action required, since wait loops on the predicate and any lingering signal will get cleared on the first iteration
is_set = false;
}
private:
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class IsSet
{
public:
IsSet(const Event* ev)
: m_event(ev)
{}
bool operator()()
{
return m_event->is_set;
}
private:
const Event* const m_event;
};
volatile bool is_set;
std::condition_variable m_condvar;
std::mutex m_mutex;
};
// TODO: doesn't work on windows with (count > 2)
class Barrier
{
public:
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Barrier(size_t count)
: m_count(count), m_waiting(0)
{}
// block until "count" threads call Sync()
bool Sync()
{
std::unique_lock<std::mutex> lk(m_mutex);
// TODO: broken when next round of Sync()s
// is entered before all waiting threads return from the notify_all
if (m_count == ++m_waiting)
{
m_waiting = 0;
m_condvar.notify_all();
return true;
}
else
{
m_condvar.wait(lk, IsDoneWating(this));
return false;
}
}
private:
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class IsDoneWating
{
public:
IsDoneWating(const Barrier* bar)
: m_bar(bar)
{}
bool operator()()
{
return (0 == m_bar->m_waiting);
}
private:
const Barrier* const m_bar;
};
std::condition_variable m_condvar;
std::mutex m_mutex;
const size_t m_count;
volatile size_t m_waiting;
};
void SleepCurrentThread(int ms);
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void SwitchCurrentThread(); // On Linux, this is equal to sleep 1ms
// Use this function during a spin-wait to make the current thread
// relax while another thread is working. This may be more efficient
// than using events because event functions use kernel calls.
inline void YieldCPU()
{
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std::this_thread::yield();
}
void SetCurrentThreadName(const char *name);
} // namespace Common