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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set et sw=2 ts=2: */
/***************************************************************************
* mutex.cc
*
* Thu Nov 12 10:51:32 CET 2009
* Copyright 2009 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of Pracro.
*
* Pracro 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.
*
* Pracro 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 Pracro; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "mutex.h"
#include <hugin.hpp>
#ifdef WIN32
#include <windows.h>
#else
#include <pthread.h>
#include <errno.h>
#endif
struct mutex_private_t {
#ifdef WIN32
HANDLE mutex;
#else
pthread_mutex_t mutex;
#endif
};
Mutex::Mutex()
{
prv = new struct mutex_private_t();
#ifdef WIN32
prv->mutex = CreateMutex(nullptr, // default security attributes
FALSE, // initially not owned
nullptr); // unnamed mutex
#else
pthread_mutex_init (&prv->mutex, nullptr);
#endif
}
Mutex::~Mutex()
{
#ifdef WIN32
CloseHandle(prv->mutex);
#else
pthread_mutex_destroy(&prv->mutex);
#endif
if(prv)
{
delete prv;
}
}
//! \return true if the function succeeds in locking the mutex for the thread.
//! false otherwise.
bool Mutex::try_lock()
{
#ifdef WIN32
DEBUG(mutex, "%s\n", __PRETTY_FUNCTION__);
DWORD result = WaitForSingleObject(prv->mutex, 0);
DEBUG(mutex, "WAIT_OBJECT_0: %lu, WAIT_TIMEOUT: %lu, result: %lu\n",
WAIT_OBJECT_0, WAIT_TIMEOUT, result);
return result != WAIT_TIMEOUT;
#else
return pthread_mutex_trylock(&prv->mutex) != EBUSY;
#endif
}
void Mutex::lock()
{
#ifdef WIN32
WaitForSingleObject(prv->mutex, // handle to mutex
INFINITE); // no time-out interval
#else
pthread_mutex_lock(&prv->mutex);
#endif
}
void Mutex::unlock()
{
#ifdef WIN32
ReleaseMutex(prv->mutex);
#else
pthread_mutex_unlock(&prv->mutex);
#endif
}
MutexAutolock::MutexAutolock(Mutex &m)
: mutex(m)
{
mutex.lock();
}
MutexAutolock::~MutexAutolock()
{
mutex.unlock();
}
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