jmutex.cpp
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/***************************************************************************
* Copyright (C) 2005 by Jeff Ferr *
* root@sat *
* *
* This program 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. *
* *
* This program 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 this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include "Stdafx.h"
#include "jmutex.h"
#include "jmutexexception.h"
namespace jthread {
Mutex::Mutex(jmutex_type_t type_, jmutex_protocol_t protocol_, bool block_in_death):
jcommon::Object()
{
jcommon::Object::SetClassName("jthread::Mutex");
#ifdef _WIN32
InitializeCriticalSection(&_mutex);
#else
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
if (type_ == JMT_FAST) {
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_FAST_NP);
} else if (type_ == JMT_RECURSIVE) {
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
} else if (type_ == JMT_ERROR_CHECK) {
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK_NP);
}
/*
if (protocol_ == NONE_PROT_MUTEX) {
pthread_mutexattr_setprotocol(&attr, PTHREAD_PRIO_NONE);
} else if (protocol_ == INHERIT_PROT_MUTEX) {
pthread_mutexattr_setprotocol(&attr, PTHREAD_PRIO_INHERIT);
} else if (protocol_ == PROTECT_PROT_MUTEX) {
pthread_mutexattr_setprotocol(&attr, PTHREAD_PRIO_PROTECT);
}
if (block_in_death == true) {
pthread_mutexattr_setrobust_np(&attr, PTHREAD_MUTEX_STALLED_NP);
} else {
pthread_mutexattr_setrobust_np(&attr, PTHREAD_MUTEX_ROBUST_NP);
}
pthread_mutexattr_setprioceiling(&attr, 0);
*/
pthread_mutex_init(&_mutex, &attr);
#endif
_type = type_;
_lock_count = 0;
}
Mutex::~Mutex()
{
#ifdef _WIN32
DeleteCriticalSection(&_mutex);
#else
/*
while (pthread_mutex_destroy(&_mutex) == EBUSY) {
Lock();
Unlock();
}
*/
pthread_mutex_destroy(&_mutex);
#endif
}
bool Mutex::IsLocked()
{
return (_lock_count != 0);
}
void Mutex::Lock()
{
#ifdef _WIN32
EnterCriticalSection(&_mutex);
#else
if (pthread_mutex_lock(&_mutex) != 0) {
if (errno == EDEADLK) {
throw MutexException("Error check monitor, dead lock ... !");
} else {
throw MutexException("Mutex lock failed !");
}
}
#endif
_lock_count++;
}
void Mutex::Unlock()
{
#ifdef _WIN32
LeaveCriticalSection(&_mutex);
#else
if (pthread_mutex_unlock(&_mutex) != 0) {
if (errno == EINVAL || errno == EFAULT || errno == EPERM) {
throw MutexException("Error check monitor, calling thread does ... !");
} else {
// throw MutexException("Mutex unlock failed !");
}
}
#endif
if (_type == JMT_FAST) {
_lock_count = 0;
} else {
_lock_count--;
}
}
bool Mutex::TryLock()
{
#ifdef _WIN32
if (TryEnterCriticalSection(&_mutex) == 0) {
return false;
}
#else
if (pthread_mutex_trylock(&_mutex) != 0) {
return false;
}
#endif
_lock_count++;
return true;
}
}