Subversion Repositories openrisc_2011-10-31

#ifndef CYGONCE_KERNEL_MBOX_HXX

#define CYGONCE_KERNEL_MBOX_HXX

//==========================================================================

//

//      mbox.hxx

//

//      Plain (void *) Mbox (Message Box/Mailbox) class declarations

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

//

// eCos 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 General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):   hmt

// Contributors:        hmt

// Date:        1998-02-10

// Purpose:     Define Mbox class interfaces

// Description: The classes defined here provide the APIs for mboxes.

// Usage:       #include 

//

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include 

#include             // assertion macros

#include 

#ifdef CYGIMP_MBOX_USE_MBOXT_PLAIN

#include 

#else

#include 

#endif

// -------------------------------------------------------------------------

// Message/Mail Box.  This class implements a queue of void * items using

// the Cyg_Mbox template class.

#ifndef CYGNUM_KERNEL_SYNCH_MBOX_QUEUE_SIZE

// default is 10 elements

#define CYGNUM_KERNEL_SYNCH_MBOX_QUEUE_SIZE (10)

#endif

// Cyg_Mbox has a fixed size array of (void *)s; one size fits all.

// Because of this, we can simplify the API by returning a NULL for

// "failed" conditions.  Ergo a NULL message is illegal.  BFD.

class Cyg_Mbox

{

private:

#ifdef CYGIMP_MBOX_USE_MBOXT_PLAIN

    Cyg_Mboxt m;

#else

    Cyg_Mboxt2 m;

#endif

public:

    CYGDBG_DEFINE_CHECK_THIS

    Cyg_Mbox();                         // Constructor

    ~Cyg_Mbox();                        // Destructor

    void *      get();                  // get an item; wait if none

#ifdef CYGFUN_KERNEL_THREADS_TIMER

    void *      get( cyg_tick_count timeout );

#endif

    void *      tryget();               // just one attempt

    void *      peek_item();            // Get next item to be returned

                                        // without removing it

#ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT   // then we support it too

    cyg_bool    put( void *item );      // put an item; wait if full

#ifdef CYGFUN_KERNEL_THREADS_TIMER

    cyg_bool    put( void *item, cyg_tick_count timeout );

#endif

#endif

    cyg_bool    tryput( void *item );   // fails if Q full

    inline

    cyg_count32 peek()                  // Get current count value

    {

        return m.peek();

    }

    inline

    cyg_bool    waiting_to_get()        // Any threads waiting to get?

    {

        return m.waiting_to_get();

    }

    inline

    cyg_bool    waiting_to_put()        // Any threads waiting to put?

    {

        return m.waiting_to_put();

    }

};

// -------------------------------------------------------------------------

#endif // ifndef CYGONCE_KERNEL_MBOX_HXX

// End of mbox.hxx