Semaphore.hpp

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/***************************************************************************
  tag: Peter Soetens  Tue Apr 5 16:53:24 CEST 2005  Semaphore.hpp 

                        Semaphore.hpp -  description
                           -------------------
    begin                : Tue April 05 2005
    copyright            : (C) 2005 Peter Soetens
    email                : peter.soetens@mech.kuleuven.ac.be
 
 ***************************************************************************
 *   This library is free software; you can redistribute it and/or         *
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 *   version 2 of the License.                                             *
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 *   software library without restriction.  Specifically, if other files   *
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#ifndef RTT_OS_SEMAPHORE_HPP
#define RTT_OS_SEMAPHORE_HPP

#include "fosi.h"
#include "../rtt-config.h"
#include "../Time.hpp"

namespace RTT
{ namespace os {
    class RTT_API Semaphore 
    {
    private:
        rt_sem_t sem;
    public:
        Semaphore(int count)
        {
            rtos_sem_init( &sem, count );
        }

        ~Semaphore()
        {
            rtos_sem_destroy( &sem );
        }

        void wait()
        {
            rtos_sem_wait( &sem );
        }

        void signal()
        {
            rtos_sem_signal( &sem );
        }

        bool trywait()
        {
            if ( rtos_sem_trywait( &sem ) == 0 )
                return true;
            return false;
        }

#ifndef OROPKG_OS_MACOSX
        int value()
        {
            return rtos_sem_value( &sem );
        }
#endif
    };
}}

#endif