src/sysc/communication/sc_semaphore.h

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/*****************************************************************************

  sc_semaphore.h -- The sc_semaphore primitive channel class.

  Original Author: Martin Janssen, Synopsys, Inc., 2001-05-21

 *****************************************************************************/

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#ifndef SC_SEMAPHORE_H
#define SC_SEMAPHORE_H


#include "sysc/kernel/sc_event.h"
#include "sysc/communication/sc_prim_channel.h"
#include "sysc/communication/sc_semaphore_if.h"

namespace sc_core {

// ----------------------------------------------------------------------------
//  CLASS : sc_semaphore
//
//  The sc_semaphore primitive channel class.
// ----------------------------------------------------------------------------

class sc_semaphore
: public sc_semaphore_if,
  public sc_prim_channel
{
public:

    // constructors

    explicit sc_semaphore( int init_value_ );
    sc_semaphore( const char* name_, int init_value_ );


    // interface methods

    // lock (take) the semaphore, block if not available
    virtual int wait();

    // lock (take) the semaphore, return -1 if not available
    virtual int trywait();

    // unlock (give) the semaphore
    virtual int post();

    // get the value of the semaphore
    virtual int get_value() const
        { return m_value; }

    virtual const char* kind() const
        { return "sc_semaphore"; }

protected:

    // support methods

    bool in_use() const
        { return ( m_value <= 0 ); }


    // error reporting
    void report_error( const char* id, const char* add_msg = 0 ) const;

protected:

    int      m_value;  // current value of the semaphore
    sc_event m_free;

private:

    // disabled
    sc_semaphore( const sc_semaphore& );
    sc_semaphore& operator = ( const sc_semaphore& );
};

} // namespace sc_core

#endif

// Taf!

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