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/* Copyright (C) 2011 J.F.Dockes
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* This program 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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* This program 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 this program; if not, write to the
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* Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef _PTMUTEX_H_INCLUDED_
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#define _PTMUTEX_H_INCLUDED_
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#include <pthread.h>
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/// A trivial wrapper/helper for pthread mutex locks
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/// Lock storage with auto-initialization. Must be created before any
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/// lock-using thread of course (possibly as a static object).
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class PTMutexInit {
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public:
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pthread_mutex_t m_mutex;
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int m_status;
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PTMutexInit() {
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m_status = pthread_mutex_init(&m_mutex, 0);
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}
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};
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/// Take the lock when constructed, release when deleted. Can be disabled
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/// by constructor params for conditional use.
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class PTMutexLocker {
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public:
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// The nolock arg enables conditional locking
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PTMutexLocker(PTMutexInit& l, bool nolock = false)
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: m_lock(l), m_status(-1) {
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if (!nolock) {
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m_status = pthread_mutex_lock(&m_lock.m_mutex);
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}
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}
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~PTMutexLocker() {
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if (m_status == 0) {
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pthread_mutex_unlock(&m_lock.m_mutex);
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}
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}
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int ok() {
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return m_status == 0;
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}
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// For pthread_cond_wait etc.
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pthread_mutex_t *getMutex() {
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return &m_lock.m_mutex;
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}
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private:
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PTMutexInit& m_lock;
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int m_status;
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};
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#endif /* _PTMUTEX_H_INCLUDED_ */
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