s3fs-fuse/src/autolock.cpp

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/*
* s3fs - FUSE-based file system backed by Amazon S3
*
* Copyright(C) 2007 Takeshi Nakatani <ggtakec.com>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <cstdlib>
#include <cerrno>
#include "autolock.h"
#include "s3fs_logger.h"
//-------------------------------------------------------------------
// Class AutoLock
//-------------------------------------------------------------------
AutoLock::AutoLock(pthread_mutex_t* pmutex, Type type) : auto_mutex(pmutex)
{
if (type == ALREADY_LOCKED) {
is_lock_acquired = false;
} else if (type == NO_WAIT) {
int result = pthread_mutex_trylock(auto_mutex);
if(result == 0){
is_lock_acquired = true;
}else if(result == EBUSY){
is_lock_acquired = false;
}else{
S3FS_PRN_CRIT("pthread_mutex_trylock returned: %d", result);
abort();
}
} else {
int result = pthread_mutex_lock(auto_mutex);
if(result == 0){
is_lock_acquired = true;
}else{
S3FS_PRN_CRIT("pthread_mutex_lock returned: %d", result);
abort();
}
}
}
bool AutoLock::isLockAcquired() const
{
return is_lock_acquired;
}
AutoLock::~AutoLock()
{
if (is_lock_acquired) {
int result = pthread_mutex_unlock(auto_mutex);
if(result != 0){
S3FS_PRN_CRIT("pthread_mutex_unlock returned: %d", result);
abort();
}
}
}
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim600: expandtab sw=4 ts=4 fdm=marker
* vim<600: expandtab sw=4 ts=4
*/