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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
/**
* \file slock.h
*
* Qpid asynchronous store plugin library
*
* Messaging journal scoped lock class mrg::journal::slock and scoped try-lock
* class mrg::journal::stlock.
*
* \author Kim van der Riet
*/
#ifndef QPID_LEGACYSTORE_JRNL_SLOCK_H
#define QPID_LEGACYSTORE_JRNL_SLOCK_H
#include "qpid/legacystore/jrnl/jexception.h"
#include "qpid/legacystore/jrnl/smutex.h"
#include <pthread.h>
namespace mrg
{
namespace journal
{
// Ultra-simple scoped lock class, auto-releases mutex when it goes out-of-scope
class slock
{
protected:
const smutex& _sm;
public:
inline slock(const smutex& sm) : _sm(sm)
{
PTHREAD_CHK(::pthread_mutex_lock(_sm.get()), "::pthread_mutex_lock", "slock", "slock");
}
inline ~slock()
{
PTHREAD_CHK(::pthread_mutex_unlock(_sm.get()), "::pthread_mutex_unlock", "slock", "~slock");
}
};
// Ultra-simple scoped try-lock class, auto-releases mutex when it goes out-of-scope
class stlock
{
protected:
const smutex& _sm;
bool _locked;
public:
inline stlock(const smutex& sm) : _sm(sm), _locked(false)
{
int ret = ::pthread_mutex_trylock(_sm.get());
_locked = (ret == 0); // check if lock obtained
if (!_locked && ret != EBUSY) PTHREAD_CHK(ret, "::pthread_mutex_trylock", "stlock", "stlock");
}
inline ~stlock()
{
if (_locked)
PTHREAD_CHK(::pthread_mutex_unlock(_sm.get()), "::pthread_mutex_unlock", "stlock", "~stlock");
}
inline bool locked() const { return _locked; }
};
} // namespace journal
} // namespace mrg
#endif // ifndef QPID_LEGACYSTORE_JRNL_SLOCK_H
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