Tomasz Sowa
fc33b4f882
now we can use Lock() more than one in the same thread
and next Unlock() will recognize it
sample:
Lock(); // first lock -- resources locked
Lock(); // second lock -- skipped (counter incremented)
...
Unlock(); // first unlock -- skipped (because counter greater than zero)
Unlock(); // second unlock -- actually unlocking
git-svn-id: svn://ttmath.org/publicrep/winix/trunk@830 e52654a7-88a9-db11-a3e9-0013d4bc506e
58 lines
611 B
C++
Executable File
58 lines
611 B
C++
Executable File
/*
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* This file is a part of Winix
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* and is not publicly distributed
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*
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* Copyright (c) 2010-2012, Tomasz Sowa
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* All rights reserved.
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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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Synchro::Synchro() : mutex(PTHREAD_MUTEX_INITIALIZER)
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{
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was_stop_signal = false;
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ref = 0;
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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 == EDEADLK )
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{
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// Lock() method in this thread was called before
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ref += 1;
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return true;
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}
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else
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{
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ref = 0;
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}
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return res == 0;
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}
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void Synchro::Unlock()
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{
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if( ref > 0 )
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{
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ref -= 1;
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}
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else
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{
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pthread_mutex_unlock(&mutex);
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}
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}
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