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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 AtomicCounter.h
*/
#ifndef qpid_asyncStore_AtomicCounter_h_
#define qpid_asyncStore_AtomicCounter_h_
#include "qpid/sys/Condition.h"
#include "qpid/sys/Mutex.h"
#include "qpid/sys/Time.h"
namespace qpid {
namespace asyncStore {
template <class T>
class AtomicCounter
{
public:
AtomicCounter(const T& initValue = T(0)) :
m_cnt(initValue),
m_cntMutex(),
m_cntCondition()
{}
virtual ~AtomicCounter()
{}
T&
get() const
{
qpid::sys::ScopedLock<qpid::sys::Mutex> l(m_cntMutex);
return m_cnt;
}
AtomicCounter&
operator++()
{
qpid::sys::ScopedLock<qpid::sys::Mutex> l(m_cntMutex);
++m_cnt;
return *this;
}
AtomicCounter&
operator--()
{
qpid::sys::ScopedLock<qpid::sys::Mutex> l(m_cntMutex);
if (--m_cnt == 0) {
m_cntCondition.notify();
}
return *this;
}
bool
operator==(const AtomicCounter& rhs)
{
qpid::sys::ScopedLock<qpid::sys::Mutex> l1(m_cntMutex);
qpid::sys::ScopedLock<qpid::sys::Mutex> l2(rhs.m_cntMutex);
return m_cnt == rhs.m_cnt;
}
bool
operator==(const T rhs)
{
qpid::sys::ScopedLock<qpid::sys::Mutex> l(m_cntMutex);
return m_cnt == rhs;
}
void
waitForZero(const qpid::sys::Duration& d)
{
qpid::sys::ScopedLock<qpid::sys::Mutex> l(m_cntMutex);
while (m_cnt != 0) {
m_cntCondition.wait(m_cntMutex, qpid::sys::AbsTime(qpid::sys::AbsTime(), d));
}
}
private:
T m_cnt;
mutable qpid::sys::Mutex m_cntMutex;
qpid::sys::Condition m_cntCondition;
};
typedef AtomicCounter<uint32_t> AsyncOpCounter;
}} // namespace qpid::asyncStore
#endif // qpid_asyncStore_AtomicCounter_h_
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