PthreadMutex.h

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//=============================================================================
//  PthreadMutex and PthreadMutexProtected classes
//-----------------------------------------------------------------------------
//  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.
//=============================================================================


#ifndef PthreadMutex_h
#define PthreadMutex_h
#pragma once

#ifdef EXTERNAL_TEMPLATES
#     pragma interface
#endif

#include <cpn/common.h>
#include <cpn/threading/PthreadDefs.h>
#ifdef _POSIX_THREADS

#include <cpn/threading/PthreadErrorHandler.h>
#include <cpn/threading/PthreadMutexAttr.h>


class PthreadMutex : public PthreadErrorHandler {
  public:
    PthreadMutex(void);
    PthreadMutex(const PthreadMutexAttr& attr);
   ~PthreadMutex(void);
   
    inline operator pthread_mutex_t* ()             { return &theMutex; }
    inline operator const pthread_mutex_t* () const { return &theMutex; }

    PthreadMutex&   Lock(void)      { TrapError(pthread_mutex_lock(&theMutex)); return *this; }
    PthreadMutex&   Unlock(void)    { TrapError(pthread_mutex_unlock(&theMutex)); return *this; }
    PthreadMutex&   Take(void)      { return Lock(); }
    PthreadMutex&   Give(void)      { return Unlock(); }

    bool            Poll(void);

private:
    pthread_mutex_t theMutex;
};


class PthreadMutexProtected {
  public:
    PthreadMutexProtected(PthreadMutex& tm): theMutex(&tm)  { theMutex->Take(); }
   ~PthreadMutexProtected()                                 { theMutex->Give(); }
  private:
    PthreadMutex*   theMutex;
};


#endif
#endif