137 lines
3.4 KiB
C++
137 lines
3.4 KiB
C++
//----------------------------------------------------------------------------
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//
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// MutexImpl.cpp
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//
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// POSIX implementation of the cross-platform mutex
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//
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// Copyright (c) 2010, Greg Satz <satz@iranger.com>
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// All rights reserved.
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//
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// SOFTWARE NOTICE AND LICENSE
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//
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// This file is part of OpenZWave.
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//
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// OpenZWave is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation, either version 3 of the License,
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// or (at your option) any later version.
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//
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// OpenZWave is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with OpenZWave. If not, see <http://www.gnu.org/licenses/>.
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//
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//-----------------------------------------------------------------------------
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#include "../../Defs.h"
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#include "../Log.h"
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#include "MutexImpl.h"
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#include <stdio.h>
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#include <errno.h>
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using namespace OpenZWave;
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//-----------------------------------------------------------------------------
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// <MutexImpl::MutexImpl>
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// Constructor
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//-----------------------------------------------------------------------------
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MutexImpl::MutexImpl
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(
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):
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m_lockCount( 0 )
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{
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pthread_mutexattr_t ma;
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pthread_mutexattr_init ( &ma );
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pthread_mutexattr_settype( &ma, PTHREAD_MUTEX_RECURSIVE );
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int err = pthread_mutex_init( &m_criticalSection, &ma );
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if( err != 0 )
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{
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fprintf(stderr, "MutexImpl::MutexImpl error %d (%d)\n", errno, err );
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}
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pthread_mutexattr_destroy( &ma );
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}
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//-----------------------------------------------------------------------------
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// <MutexImpl::~MutexImpl>
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// Destructor
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//-----------------------------------------------------------------------------
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MutexImpl::~MutexImpl
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(
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)
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{
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pthread_mutex_destroy( &m_criticalSection );
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}
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//-----------------------------------------------------------------------------
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// <MutexImpl::Lock>
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// Lock the mutex
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//-----------------------------------------------------------------------------
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bool MutexImpl::Lock
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(
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bool const _bWait
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)
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{
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if( _bWait )
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{
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// We will wait for the lock
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int err = pthread_mutex_lock( &m_criticalSection );
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if( err == 0 )
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{
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++m_lockCount;
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return true;
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}
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fprintf(stderr, "MutexImpl::Lock error %d (%d)\n", errno, err);
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return false;
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}
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// Returns immediately, even if the lock was not available.
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if( pthread_mutex_trylock( &m_criticalSection ) )
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{
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return false;
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}
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++m_lockCount;
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return true;
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}
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//-----------------------------------------------------------------------------
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// <MutexImpl::Unlock>
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// Release our lock on the mutex
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//-----------------------------------------------------------------------------
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void MutexImpl::Unlock
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(
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)
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{
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if( !m_lockCount )
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{
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// No locks - we have a mismatched lock/release pair
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assert(0);
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}
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else
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{
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--m_lockCount;
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int err = pthread_mutex_unlock( &m_criticalSection );
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if( err != 0 )
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{
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fprintf(stderr, "MutexImpl::Unlock error %d (%d)\n", errno, err);
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}
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}
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}
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//-----------------------------------------------------------------------------
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// <MutexImpl::IsSignalled>
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// Test whether the mutex is free
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//-----------------------------------------------------------------------------
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bool MutexImpl::IsSignalled
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(
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)
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{
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return( 0 == m_lockCount );
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}
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