Semaphore.h

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/*
 * Semaphore.h
 *
 * Smalltalk like class library for C++
 * Semaphore. Header.
 *
 * Copyright (c) 2003 Milan Cermak
 */
/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#ifndef __SEMAPHORE_H
#define __SEMAPHORE_H

#if !defined(_REENTRANT)
#  define _REENTRANT
#endif
#include <pthread.h>
#include <semaphore.h>

#include <stlib/Object.h>

namespace OS {

class Semaphore : public Core::Object
{
  protected:
    sem_t handle;

  public:
    Semaphore(void);
    virtual ~Semaphore(void);

    /* Instance creation protocol */
    static Semaphore *forMutualExclusion(void);

    /* Communication protocol */
    virtual void signal(void);
    virtual void wait(void);
};

#define _critical(mutex, guardedBlock) \
    _ensure( \
        mutex->wait(); \
        guardedBlock \
    , \
        mutex->signal() \
    )

};

#endif /* __SEMAPHORE_H */

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