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82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
//
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// Mutex_WIN32.cpp
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//
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// $Id: //poco/1.4/Foundation/src/Mutex_WIN32.cpp#1 $
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//
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// Library: Foundation
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// Package: Threading
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// Module: Mutex
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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//
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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, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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#include "Poco/Mutex_WIN32.h"
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#include "Poco/Timestamp.h"
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namespace Poco {
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MutexImpl::MutexImpl()
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{
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// the fct has a boolean return value under WInnNt/2000/XP but not on Win98
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// the return only checks if the input address of &_cs was valid, so it is safe to omit it
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InitializeCriticalSectionAndSpinCount(&_cs, 4000);
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}
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MutexImpl::~MutexImpl()
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{
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DeleteCriticalSection(&_cs);
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}
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bool MutexImpl::tryLockImpl(long milliseconds)
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{
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const int sleepMillis = 5;
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Timestamp now;
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Timestamp::TimeDiff diff(Timestamp::TimeDiff(milliseconds)*1000);
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do
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{
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try
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{
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if (TryEnterCriticalSection(&_cs) == TRUE)
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return true;
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}
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catch (...)
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{
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throw SystemException("cannot lock mutex");
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}
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Sleep(sleepMillis);
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}
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while (!now.isElapsed(diff));
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return false;
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}
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} // namespace Poco
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