/* Copyright (C) 2011 J.F.Dockes
* 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.
*/
#ifndef _PTMUTEX_H_INCLUDED_
#define _PTMUTEX_H_INCLUDED_
#include <pthread.h>
/// A trivial wrapper/helper for pthread mutex locks
/// Lock storage with auto-initialization. Must be created before any
/// lock-using thread of course (possibly as a static object).
class PTMutexInit {
public:
pthread_mutex_t m_mutex;
int m_status;
PTMutexInit() {
m_status = pthread_mutex_init(&m_mutex, 0);
}
};
/// Take the lock when constructed, release when deleted. Can be disabled
/// by constructor params for conditional use.
class PTMutexLocker {
public:
// The nolock arg enables conditional locking
PTMutexLocker(PTMutexInit& l, bool nolock = false)
: m_lock(l), m_status(-1) {
if (!nolock) {
m_status = pthread_mutex_lock(&m_lock.m_mutex);
}
}
~PTMutexLocker() {
if (m_status == 0) {
pthread_mutex_unlock(&m_lock.m_mutex);
}
}
int ok() {
return m_status == 0;
}
// For pthread_cond_wait etc.
pthread_mutex_t *getMutex() {
return &m_lock.m_mutex;
}
private:
PTMutexInit& m_lock;
int m_status;
};
#endif /* _PTMUTEX_H_INCLUDED_ */