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178 lines
5.0 KiB
C++
178 lines
5.0 KiB
C++
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//
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// Mutex_POSIX.cpp
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//
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// $Id: //poco/1.4/Foundation/src/Mutex_POSIX.cpp#4 $
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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) 2004-2008, 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_POSIX.h"
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#include "Poco/Timestamp.h"
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#if !defined(POCO_NO_SYS_SELECT_H)
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#include <sys/select.h>
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#endif
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#include <unistd.h>
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#if defined(POCO_VXWORKS)
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#include <timers.h>
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#include <cstring>
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#else
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#include <sys/time.h>
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#endif
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#if defined(_POSIX_TIMEOUTS) && (_POSIX_TIMEOUTS - 200112L) >= 0L
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#if defined(_POSIX_THREADS) && (_POSIX_THREADS - 200112L) >= 0L
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#define POCO_HAVE_MUTEX_TIMEOUT
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#endif
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#endif
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namespace Poco {
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MutexImpl::MutexImpl()
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{
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#if defined(POCO_VXWORKS)
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// This workaround is for VxWorks 5.x where
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// pthread_mutex_init() won't properly initialize the mutex
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// resulting in a subsequent freeze in pthread_mutex_destroy()
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// if the mutex has never been used.
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std::memset(&_mutex, 0, sizeof(_mutex));
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#endif
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pthread_mutexattr_t attr;
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pthread_mutexattr_init(&attr);
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#if defined(PTHREAD_MUTEX_RECURSIVE_NP)
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pthread_mutexattr_settype_np(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
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#elif !defined(POCO_VXWORKS)
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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#endif
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if (pthread_mutex_init(&_mutex, &attr))
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{
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pthread_mutexattr_destroy(&attr);
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throw SystemException("cannot create mutex");
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}
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pthread_mutexattr_destroy(&attr);
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}
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MutexImpl::MutexImpl(bool fast)
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{
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#if defined(POCO_VXWORKS)
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// This workaround is for VxWorks 5.x where
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// pthread_mutex_init() won't properly initialize the mutex
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// resulting in a subsequent freeze in pthread_mutex_destroy()
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// if the mutex has never been used.
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std::memset(&_mutex, 0, sizeof(_mutex));
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#endif
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pthread_mutexattr_t attr;
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pthread_mutexattr_init(&attr);
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#if defined(PTHREAD_MUTEX_RECURSIVE_NP)
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pthread_mutexattr_settype_np(&attr, fast ? PTHREAD_MUTEX_NORMAL_NP : PTHREAD_MUTEX_RECURSIVE_NP);
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#elif !defined(POCO_VXWORKS)
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pthread_mutexattr_settype(&attr, fast ? PTHREAD_MUTEX_NORMAL : PTHREAD_MUTEX_RECURSIVE);
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#endif
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if (pthread_mutex_init(&_mutex, &attr))
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{
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pthread_mutexattr_destroy(&attr);
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throw SystemException("cannot create mutex");
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}
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pthread_mutexattr_destroy(&attr);
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}
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MutexImpl::~MutexImpl()
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{
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pthread_mutex_destroy(&_mutex);
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}
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bool MutexImpl::tryLockImpl(long milliseconds)
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{
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#if defined(POCO_HAVE_MUTEX_TIMEOUT)
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struct timespec abstime;
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struct timeval tv;
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gettimeofday(&tv, NULL);
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abstime.tv_sec = tv.tv_sec + milliseconds / 1000;
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abstime.tv_nsec = tv.tv_usec*1000 + (milliseconds % 1000)*1000000;
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if (abstime.tv_nsec >= 1000000000)
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{
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abstime.tv_nsec -= 1000000000;
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abstime.tv_sec++;
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}
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int rc = pthread_mutex_timedlock(&_mutex, &abstime);
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if (rc == 0)
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return true;
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else if (rc == ETIMEDOUT)
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return false;
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else
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throw SystemException("cannot lock mutex");
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#else
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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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int rc = pthread_mutex_trylock(&_mutex);
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if (rc == 0)
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return true;
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else if (rc != EBUSY)
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throw SystemException("cannot lock mutex");
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#if defined(POCO_VXWORKS)
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struct timespec ts;
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ts.tv_sec = 0;
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ts.tv_nsec = sleepMillis*1000000;
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nanosleep(&ts, NULL);
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#else
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struct timeval tv;
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tv.tv_sec = 0;
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tv.tv_usec = sleepMillis * 1000;
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select(0, NULL, NULL, NULL, &tv);
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#endif
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}
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while (!now.isElapsed(diff));
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return false;
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#endif
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}
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FastMutexImpl::FastMutexImpl(): MutexImpl(true)
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{
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}
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FastMutexImpl::~FastMutexImpl()
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{
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}
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} // namespace Poco
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