154 lines
3.6 KiB
C++
154 lines
3.6 KiB
C++
// Copyright (C) 2003 Dolphin Project.
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, version 2.0.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License 2.0 for more details.
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// A copy of the GPL 2.0 should have been included with the program.
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// If not, see http://www.gnu.org/licenses/
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// Official SVN repository and contact information can be found at
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// http://code.google.com/p/dolphin-emu/
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#ifndef _THREAD_H_
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#define _THREAD_H_
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#include "StdThread.h"
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// Don't include common.h here as it will break LogManager
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#include "CommonTypes.h"
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#include <stdio.h>
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#include <string.h>
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// This may not be defined outside _WIN32
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#ifndef _WIN32
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#ifndef INFINITE
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#define INFINITE 0xffffffff
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#endif
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#include <xmmintrin.h>
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//for gettimeofday and struct time(spec|val)
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#include <time.h>
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#include <sys/time.h>
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#endif
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namespace Common
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{
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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 CriticalSection
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{
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#ifdef _WIN32
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CRITICAL_SECTION section;
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#else
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#ifdef _POSIX_THREADS
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pthread_mutex_t mutex;
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#endif
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#endif
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public:
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CriticalSection(int spincount = 1000);
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~CriticalSection();
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void Enter();
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bool TryEnter();
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void Leave();
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};
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#ifdef _WIN32
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// Event(WaitForSingleObject) is too expensive
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// as it always enters Ring0 regardless of the state of lock
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// This EventEx will try to stay in Ring3 as much as possible
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// If the lock can be obtained in the first time, Ring0 won't be entered at all
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class EventEx
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{
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public:
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EventEx();
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void Init();
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void Shutdown();
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void Set();
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// Infinite wait
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void Spin();
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// Infinite wait with sleep
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void Wait();
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// Wait with message processing and sleep
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bool MsgWait();
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private:
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volatile long m_Lock;
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};
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#else
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// TODO: implement for Linux
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#define EventEx Event
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#endif
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class Event
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{
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public:
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Event();
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void Init();
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void Shutdown();
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void Set();
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//returns whether the wait timed out
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bool Wait(const u32 timeout = INFINITE);
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#ifdef _WIN32
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void MsgWait();
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#else
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void MsgWait() {Wait();}
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#endif
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private:
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#ifdef _WIN32
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HANDLE m_hEvent;
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/* If we have waited more than five seconds we can be pretty sure that the thread is deadlocked.
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So then we can just as well continue and hope for the best. I could try several times that
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this works after a five second timeout (with works meaning that the game stopped and I could
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start another game without any noticable problems). But several times it failed to, and ended
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with a crash. But it's better than an infinite deadlock. */
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static const int THREAD_WAIT_TIMEOUT = 5000; // INFINITE or 5000 for example
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#else
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bool is_set_;
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#ifdef _POSIX_THREADS
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pthread_cond_t event_;
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pthread_mutex_t mutex_;
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#endif
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#endif
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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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// YieldCPU: This function is only effective on HyperThreading CPU
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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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{
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#ifdef _WIN32
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YieldProcessor();
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#elif defined(_M_IX86) || defined(_M_X64)
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_mm_pause();
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#endif
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}
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void SetCurrentThreadName(const char *name);
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} // namespace Common
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#endif // _THREAD_H_
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