108 lines
2.4 KiB
C++
108 lines
2.4 KiB
C++
/*
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* This file is a part of Winix
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* and is distributed under the 2-Clause BSD licence.
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* Author: Tomasz Sowa <t.sowa@ttmath.org>
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*/
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/*
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* Copyright (c) 2010-2014, Tomasz Sowa
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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*/
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#include <errno.h>
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#include "synchro.h"
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namespace Winix
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{
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Synchro::Synchro()
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{
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was_stop_signal = false;
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#ifdef __FreeBSD__
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/*
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* on FreeBSD a pthread's pthread_mutex_lock() is checking for deadlocks by default
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*/
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mutex = PTHREAD_MUTEX_INITIALIZER;
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#else
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pthread_mutexattr_t attr;
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pthread_mutexattr_init(&attr);
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
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pthread_mutex_init(&mutex, &attr);
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pthread_mutexattr_destroy(&attr);
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#endif
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}
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bool Synchro::Lock()
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{
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int res = pthread_mutex_lock(&mutex);
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if( res == 0 )
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{
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ref[pthread_self()] = 1;
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return true;
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}
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else
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if( res == EDEADLK )
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{
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// Lock() method in this thread was called before
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ref[pthread_self()] += 1;
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return true;
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}
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return false;
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}
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void Synchro::Unlock()
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{
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int & r = ref[pthread_self()];
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if( r > 1 )
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{
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r -= 1;
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}
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else
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if( r == 1 )
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{
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pthread_mutex_unlock(&mutex);
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}
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}
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} // namespace Winix
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