sc_semaphore.h

来自「基于4个mips核的noc设计」· C头文件 代码 · 共 111 行

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

  The following code is derived, directly or indirectly, from the SystemC
  source code Copyright (c) 1996-2002 by all Contributors.
  All Rights reserved.

  The contents of this file are subject to the restrictions and limitations
  set forth in the SystemC Open Source License Version 2.3 (the "License");
  You may not use this file except in compliance with such restrictions and
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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 "systemc/kernel/sc_event.h"
#include "systemc/communication/sc_prim_channel.h"
#include "systemc/communication/sc_semaphore_if.h"


// ----------------------------------------------------------------------------
//  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; }


    static const char* const kind_string;

    virtual const char* kind() const
        { return kind_string; }

protected:

    // support methods

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


    // error reporting
    void report_error( int 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& );
};


#endif

// Taf!