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File: [Pegasus] / pegasus / src / Pegasus / Common / AsyncQueue.h
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Revision: 1.5.38.1, Wed Aug 20 22:05:49 2008 UTC (15 years, 10 months ago) by karl Branch: TASK-PEP328_SOLARIS_NEVADA_PORT_v2-branch Changes since 1.5: +7 -69 lines PEP#: 328 TITLE: Sun port. Update to new branch for test DESCRIPTION: Update to new branch for port test with current code |
//%2006//////////////////////////////////////////////////////////////////////// // // Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development // Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems. // Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.; // IBM Corp.; EMC Corporation, The Open Group. // Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.; // IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group. // Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.; // EMC Corporation; VERITAS Software Corporation; The Open Group. // Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.; // EMC Corporation; Symantec Corporation; The Open Group. // // Permission is hereby granted, free of charge, to any person obtaining a copy // of this software and associated documentation files (the "Software"), to // deal in the Software without restriction, including without limitation the // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or // sell copies of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN // ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED // "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT // LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT // HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. // //============================================================================== // //%///////////////////////////////////////////////////////////////////////////// #ifndef Pegasus_AsyncQueue_h #define Pegasus_AsyncQueue_h #include <Pegasus/Common/Linkage.h> #include <Pegasus/Common/List.h> #include <Pegasus/Common/Condition.h> PEGASUS_NAMESPACE_BEGIN /** AsyncQueue implementation (formerly AsyncDQueue). */ template<class ElemType> class AsyncQueue { public: /** Constructor. */ AsyncQueue(); /** Destructor. */ virtual ~AsyncQueue(); /** Close the queue so that subsequent enqueue() and dequeue() requests result in ListClosed() exceptions. */ void close(); /** Enqueue an element at the back of queue. */ void enqueue(ElemType *element); /** Dequeue an element from the front of the queue. Return null immediately if queue is empty. */ ElemType *dequeue(); /** Dequeue an element from the front of the queue (wait if the queue is empty). */ ElemType *dequeue_wait(); /** Discard all the elements on the list. The size becomes zero afterwards. */ void clear(); /** Return number of element in queue. */ Uint32 count() const { return _rep.size(); } /** Return true is queue is empty (has zero elements). */ Boolean is_empty() const { return _rep.size() == 0; } /** Return true if the queue has been closed (in which case no new elements may be enqueued). */ Boolean is_closed() const { return _closed.get(); } private: Mutex _mutex; Condition _not_empty; AtomicInt _closed; typedef List<ElemType,NullLock> Rep; Rep _rep; }; template<class ElemType> AsyncQueue<ElemType>::AsyncQueue() : _mutex(Mutex::NON_RECURSIVE) { } template<class ElemType> AsyncQueue<ElemType>::~AsyncQueue() { } template<class ElemType> void AsyncQueue<ElemType>::close() { AutoMutex auto_mutex(_mutex); if (!is_closed()) { _closed++; _not_empty.signal(); } } template<class ElemType> void AsyncQueue<ElemType>::enqueue(ElemType *element) { if (element) { AutoMutex auto_mutex(_mutex); if (is_closed()) throw ListClosed(); _rep.insert_back(element); _not_empty.signal(); } } template<class ElemType> void AsyncQueue<ElemType>::clear() { AutoMutex auto_mutex(_mutex); _rep.clear(); } template<class ElemType> ElemType* AsyncQueue<ElemType>::dequeue() { AutoMutex auto_mutex(_mutex); if (is_closed()) throw ListClosed(); return _rep.remove_front(); } template<class ElemType> ElemType* AsyncQueue<ElemType>::dequeue_wait() { AutoMutex auto_mutex(_mutex); while (is_empty()) { if (is_closed()) throw ListClosed(); _not_empty.wait(_mutex); } if (is_closed()) throw ListClosed(); ElemType* p = _rep.remove_front(); PEGASUS_DEBUG_ASSERT(p != 0); return p; } PEGASUS_NAMESPACE_END #endif /* Pegasus_AsyncQueue_h */
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