janwas
6d25329412
c.f. http://www.wildfiregames.com/forum/index.php?showtopic=14541&st=0&p=217250&#entry217250 and 2011-03-19 meeting This was SVN commit r9090.
119 lines
2.5 KiB
C++
119 lines
2.5 KiB
C++
/* Copyright (C) 2010 Wildfire Games.
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* This file is part of 0 A.D.
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*
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* 0 A.D. 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, either version 2 of the License, or
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* (at your option) any later version.
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*
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* 0 A.D. 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 for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with 0 A.D. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef INCLUDED_THREADUTIL
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#define INCLUDED_THREADUTIL
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#include "lib/posix/posix_pthread.h"
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#include "lib/posix/posix_filesystem.h" // O_CREAT
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#ifdef DEBUG_LOCKS
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#define LOCK_MUTEX(_mutex) STMT( \
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printf("pthread_mutex_lock: 1 %p [pid:%d]\n", _mutex, pthread_self()); \
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pthread_mutex_lock(_mutex); \
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printf("pthread_mutex_lock: 2 %p [pid:%d]\n", _mutex, pthread_self()) \
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)
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#define UNLOCK_MUTEX(_mutex) STMT( \
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pthread_mutex_unlock(_mutex); \
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printf("pthread_mutex_unlock: %p [pid:%d]\n", _mutex, pthread_self()) \
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)
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#else
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#define LOCK_MUTEX(_mutex) pthread_mutex_lock(_mutex)
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#define UNLOCK_MUTEX(_mutex) pthread_mutex_unlock(_mutex)
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#endif
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/**
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* A non-recursive mutual exclusion lock.
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*/
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class CMutex
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{
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NONCOPYABLE(CMutex);
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friend class CScopeLock;
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public:
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CMutex()
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{
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int ret = pthread_mutex_init(&m_Mutex, NULL);
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debug_assert(ret == 0);
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}
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~CMutex()
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{
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int ret = pthread_mutex_destroy(&m_Mutex);
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debug_assert(ret == 0);
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}
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private:
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pthread_mutex_t m_Mutex;
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};
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/**
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* Locks a CMutex over this object's lifetime.
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* The mutexes are non-recursive - a single thread locking a mutex more than once
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* results in undefined behaviour.
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*/
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class CScopeLock
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{
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NONCOPYABLE(CScopeLock);
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public:
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CScopeLock(pthread_mutex_t* mutex) :
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m_Mutex(mutex)
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{
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LOCK_MUTEX(m_Mutex);
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}
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CScopeLock(CMutex& mutex) :
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m_Mutex(&mutex.m_Mutex)
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{
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LOCK_MUTEX(m_Mutex);
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}
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~CScopeLock()
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{
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UNLOCK_MUTEX(m_Mutex);
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}
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private:
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pthread_mutex_t* m_Mutex;
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};
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namespace ThreadUtil
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{
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/**
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* Returns whether the current thread is the 'main' thread
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* (i.e. matches an earlier call to SetMainThread).
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*/
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bool IsMainThread();
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/**
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* Set the current thread as the 'main' thread.
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* (This is called during engine initialisation.)
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*/
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void SetMainThread();
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}
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#endif // INCLUDED_THREADUTIL
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