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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 cvar.h
*
* Qpid asynchronous store plugin library
*
* This file contains a posix condition variable class.
*
* \author Kim van der Riet
*/
#ifndef QPID_LEGACYSTORE_JRNL_CVAR_H
#define QPID_LEGACYSTORE_JRNL_CVAR_H
#include <cstring>
#include "qpid/legacystore/jrnl/jerrno.h"
#include "qpid/legacystore/jrnl/jexception.h"
#include "qpid/legacystore/jrnl/smutex.h"
#include "qpid/legacystore/jrnl/time_ns.h"
#include <pthread.h>
#include <sstream>
namespace mrg
{
namespace journal
{
// Ultra-simple thread condition variable class
class cvar
{
private:
const smutex& _sm;
pthread_cond_t _c;
public:
inline cvar(const smutex& sm) : _sm(sm) { ::pthread_cond_init(&_c, 0); }
inline ~cvar() { ::pthread_cond_destroy(&_c); }
inline void wait()
{
PTHREAD_CHK(::pthread_cond_wait(&_c, _sm.get()), "::pthread_cond_wait", "cvar", "wait");
}
inline void timedwait(timespec& ts)
{
PTHREAD_CHK(::pthread_cond_timedwait(&_c, _sm.get(), &ts), "::pthread_cond_timedwait", "cvar", "timedwait");
}
inline bool waitintvl(const long intvl_ns)
{
time_ns t; t.now(); t+=intvl_ns;
int ret = ::pthread_cond_timedwait(&_c, _sm.get(), &t);
if (ret == ETIMEDOUT)
return true;
PTHREAD_CHK(ret, "::pthread_cond_timedwait", "cvar", "waitintvl");
return false;
}
inline void signal()
{
PTHREAD_CHK(::pthread_cond_signal(&_c), "::pthread_cond_signal", "cvar", "notify");
}
inline void broadcast()
{
PTHREAD_CHK(::pthread_cond_broadcast(&_c), "::pthread_cond_broadcast", "cvar", "broadcast");
}
};
} // namespace journal
} // namespace mrg
#endif // ifndef QPID_LEGACYSTORE_JRNL_CVAR_H
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