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selove / src / modules / thread / sdl / threads.cpp

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/**
* Copyright (c) 2006-2012 LOVE Development Team
*
* This software is provided 'as-is', without any express or implied
* warranty.  In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
*    claim that you wrote the original software. If you use this software
*    in a product, an acknowledgment in the product documentation would be
*    appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
*    misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
**/

#include "threads.h"

namespace love
{
namespace thread
{
	Mutex::Mutex()
	{
		mutex = SDL_CreateMutex();
	}

	Mutex::~Mutex()
	{
		SDL_DestroyMutex(mutex);
	}

	void Mutex::lock()
	{
		SDL_mutexP(mutex);
	}

	void Mutex::unlock()
	{
		SDL_mutexV(mutex);
	}

	int ThreadBase::thread_runner(void* param)
	{
		ThreadBase* thread = (ThreadBase*)param;
		thread->main();
		return 0;
	}

	ThreadBase::ThreadBase()
		: running(false)
	{
	}

	ThreadBase::~ThreadBase()
	{
		if (running)
		{
			wait();
		}
	}

	bool ThreadBase::start()
	{
		thread = SDL_CreateThread(thread_runner, this);
		if (thread == NULL)
			return false;
		else
			return (running = true);
	}

	void ThreadBase::wait()
	{
		SDL_WaitThread(thread, NULL);
		running = false;
	}

	void ThreadBase::kill()
	{
		SDL_KillThread(thread);
		running = false;
	}

	unsigned int ThreadBase::threadId()
	{
		return (unsigned int)SDL_ThreadID();
	}

	Semaphore::Semaphore(unsigned int initial_value)
	{
		semaphore = SDL_CreateSemaphore(initial_value);
	}

	Semaphore::~Semaphore()
	{
		SDL_DestroySemaphore(semaphore);
	}

	unsigned int Semaphore::value()
	{
		return SDL_SemValue(semaphore);
	}

	void Semaphore::post()
	{
		SDL_SemPost(semaphore);
	}

	bool Semaphore::wait(int timeout)
	{
		if (timeout < 0)
			return SDL_SemWait(semaphore) ? false : true;
		else if (timeout == 0)
			return SDL_SemTryWait(semaphore) ? false : true;
		else
		{
			int ret = SDL_SemWaitTimeout(semaphore, timeout);
			return (ret == 0);
		}
	}

	bool Semaphore::tryWait()
	{
		return SDL_SemTryWait(semaphore) ? false : true;
	}

	Conditional::Conditional()
	{
		cond = SDL_CreateCond();
	}

	Conditional::~Conditional()
	{
		SDL_DestroyCond(cond);
	}

	void Conditional::signal()
	{
		SDL_CondSignal(cond);
	}

	void Conditional::broadcast()
	{
		SDL_CondBroadcast(cond);
	}

	bool Conditional::wait(Mutex* mutex, int timeout)
	{
		if (timeout < 0)
			return !SDL_CondWait(cond, mutex->mutex);
		else
			return (SDL_CondWaitTimeout(cond, mutex->mutex, timeout) == 0);
	}

} // thread
} // love