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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_