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/* Copyright (C) 2010 Wildfire Games.
* This file is part of 0 A.D.
*
* 0 A.D. is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* 0 A.D. is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef INCLUDED_THREADUTIL
#define INCLUDED_THREADUTIL
#include "lib/posix/posix_pthread.h"
#ifdef DEBUG_LOCKS
#define LOCK_MUTEX(_mutex) STMT( \
printf("pthread_mutex_lock: 1 %p [pid:%d]\n", _mutex, pthread_self()); \
pthread_mutex_lock(_mutex); \
printf("pthread_mutex_lock: 2 %p [pid:%d]\n", _mutex, pthread_self()) \
)
#define UNLOCK_MUTEX(_mutex) STMT( \
pthread_mutex_unlock(_mutex); \
printf("pthread_mutex_unlock: %p [pid:%d]\n", _mutex, pthread_self()) \
)
#else
#define LOCK_MUTEX(_mutex) pthread_mutex_lock(_mutex)
#define UNLOCK_MUTEX(_mutex) pthread_mutex_unlock(_mutex)
#endif
/**
* A non-recursive mutual exclusion lock.
*/
class CMutex
{
NONCOPYABLE(CMutex);
friend class CScopeLock;
public:
CMutex()
{
int ret = pthread_mutex_init(&m_Mutex, NULL);
ENSURE(ret == 0);
}
~CMutex()
{
int ret = pthread_mutex_destroy(&m_Mutex);
ENSURE(ret == 0);
}
private:
pthread_mutex_t m_Mutex;
};
/**
* Locks a CMutex over this object's lifetime.
* The mutexes are non-recursive - a single thread locking a mutex more than once
* results in undefined behaviour.
*/
class CScopeLock
{
NONCOPYABLE(CScopeLock);
public:
CScopeLock(pthread_mutex_t* mutex) :
m_Mutex(mutex)
{
LOCK_MUTEX(m_Mutex);
}
CScopeLock(CMutex& mutex) :
m_Mutex(&mutex.m_Mutex)
{
LOCK_MUTEX(m_Mutex);
}
~CScopeLock()
{
UNLOCK_MUTEX(m_Mutex);
}
private:
pthread_mutex_t* m_Mutex;
};
namespace ThreadUtil
{
/**
* Returns whether the current thread is the 'main' thread
* (i.e. matches an earlier call to SetMainThread).
*/
bool IsMainThread();
/**
* Set the current thread as the 'main' thread.
* (This is called during engine initialisation.)
*/
void SetMainThread();
}
#endif // INCLUDED_THREADUTIL
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