PthreadMutex.cc

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//=============================================================================
//  PthreadMutex class
//-----------------------------------------------------------------------------
//  POSIX Pthread class library
//  Copyright (C) 1997-1999  The University of Texas
//
//  This library is free software; you can redistribute it and/or modify it
//  under the terms of the GNU Library General Public License as published
//  by the Free Software Foundation; either version 2 of the License, or
//  (at your option) any later version.
//
//  This library is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//  Library General Public License for more details.
//
//  The GNU Public License is available in the file LICENSE, or you
//  can write to the Free Software Foundation, Inc., 59 Temple Place -
//  Suite 330, Boston, MA 02111-1307, USA, or you can find it on the
//  World Wide Web at http://www.fsf.org.
//=============================================================================

#ifdef EXTERNAL_TEMPLATES
#     pragma implementation "PthreadMutex.h"
#endif

#include <cpn/threading/PthreadMutex.h>
#ifdef _POSIX_THREADS
#include <errno.h>


//-----------------------------------------------------------------------------
PthreadMutex::PthreadMutex(void)
//-----------------------------------------------------------------------------
//: theMutex(PTHREAD_MUTEX_INITIALIZER)
{
    TrapError(pthread_mutex_init(&theMutex, 0));
}


//-----------------------------------------------------------------------------
PthreadMutex::PthreadMutex(const PthreadMutexAttr& mAttr)
//-----------------------------------------------------------------------------
{   
    //  It should simply be:
//  TrapError(pthread_mutex_init(&theMutex, mAttr));

    //  This is necessary because
    //      SGI's pthread_mutex_init is not const correct!!!

    pthread_mutexattr_t* myAttr = (PthreadMutexAttr&)mAttr;
    TrapError(pthread_mutex_init(&theMutex, myAttr));
}


//-----------------------------------------------------------------------------
PthreadMutex::~PthreadMutex(void)
//-----------------------------------------------------------------------------
{
    try {
        TrapError(pthread_mutex_destroy(&theMutex));
    } catch (...) {
        std::terminate();
    }
}


//-----------------------------------------------------------------------------
bool PthreadMutex::Poll(void)
//-----------------------------------------------------------------------------
{   int err = pthread_mutex_trylock(&theMutex);
    if(err == EBUSY)
        return false;
    TrapError(err);
    return true;
}


#endif