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Diffstat (limited to 'cpp/src/qpid/asyncStore/AtomicCounter.h')
-rw-r--r-- | cpp/src/qpid/asyncStore/AtomicCounter.h | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/cpp/src/qpid/asyncStore/AtomicCounter.h b/cpp/src/qpid/asyncStore/AtomicCounter.h new file mode 100644 index 0000000000..6987b09384 --- /dev/null +++ b/cpp/src/qpid/asyncStore/AtomicCounter.h @@ -0,0 +1,106 @@ +/* + * 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_ |