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* Copyright (c) 2005, Eric Crahen
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is furnished
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* to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef __ZTFASTRECURSIVELOCK_H__
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#define __ZTFASTRECURSIVELOCK_H__
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#include "zthread/Exceptions.h"
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#include "zthread/NonCopyable.h"
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* @class FastRecursiveLock
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* @author Eric Crahen <http://www.code-foo.com>
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* @date <2003-07-16T23:32:56-0400>
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* This FastRecursiveLock implementation is based on a Win32 Mutex
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* object. This will perform better under high contention,
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* but will not be as fast as the spin lock under reasonable
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class FastRecursiveLock : private NonCopyable {
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volatile unsigned int _count;
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* Create a new FastRecursiveLock
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FastRecursiveLock() : _count(0) {
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_hMutex = ::CreateMutex(0, 0, 0);
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assert(_hMutex != NULL);
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throw Initialization_Exception();
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~FastRecursiveLock() {
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::CloseHandle(_hMutex);
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if(::WaitForSingleObject(_hMutex, INFINITE) != WAIT_OBJECT_0) {
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throw Synchronization_Exception();
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if(::ReleaseMutex(_hMutex) == 0) {
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throw Synchronization_Exception();
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bool tryAcquire(unsigned long) {
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switch(::WaitForSingleObject(_hMutex, 0)) {
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throw Synchronization_Exception();
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}; /* FastRecursiveLock */
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} // namespace ZThread