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#ifndef CYGONCE_KERNEL_MBOXT2_HXX
#define CYGONCE_KERNEL_MBOXT2_HXX
//==========================================================================
//
// mboxt2.hxx
//
// Mboxt2 (Message Box/Mailbox) class declarations
//
//==========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, 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.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 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 v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): hmt
// Contributors: hmt
// Date: 1998-02-10
// Purpose: Define Mboxt2 class interfaces
// Description: The classes defined here provide the APIs for mboxt2es.
// Usage: #include <cyg/kernel/mboxt2.hxx>
// #include <cyg/kernel/mboxt2.inl>
//
//
//####DESCRIPTIONEND####
//
//==========================================================================
#include <cyg/kernel/ktypes.h>
#include <cyg/infra/cyg_ass.h> // assertion macros
#include <cyg/kernel/thread.hxx>
#include <cyg/kernel/thread.inl>
// -------------------------------------------------------------------------
// Message/Mail Box. This template implements a queue of T's.
// Implemented as a template for maximal flexibility; one would hope
// that only one, with T==(void *) and the same number of them,
// is ever used without very good reason.
// Cyg_Mboxt2 has a fixed size array of T's; one size fits all.
template <class T, cyg_count32 QUEUE_SIZE>
class Cyg_Mboxt2
{
private:
cyg_count32 base; // index of first used slot
cyg_count32 count; // count of used slots
Cyg_ThreadQueue get_threadq; // Queue of waiting threads
#ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
Cyg_ThreadQueue put_threadq; // Queue of waiting threads
#endif
static const
cyg_count32 size = QUEUE_SIZE;
T itemqueue[ QUEUE_SIZE ];
// queue of items
// private utility functions
// wake up a thread from some queue
inline void wakeup_winner( const T &msg );
#ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
inline void wakeup_putter( void );
#endif
public:
CYGDBG_DEFINE_CHECK_THIS
Cyg_Mboxt2(); // Constructor
~Cyg_Mboxt2(); // Destructor
cyg_bool get( T &ritem ); // get an item; wait if none
#ifdef CYGFUN_KERNEL_THREADS_TIMER
cyg_bool get( T &ritem, cyg_tick_count abs_timeout );
#endif
cyg_bool tryget( T &ritem ); // just one attempt
cyg_bool peek_item( T &ritem ); // get next item without
// removing it
#ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
cyg_bool put( const T item ); // put an item; wait if full
#ifdef CYGFUN_KERNEL_THREADS_TIMER
cyg_bool put( const T item, cyg_tick_count abs_timeout );
#endif
#endif
cyg_bool tryput( const T item ); // fails if Q full
inline
cyg_count32 peek() // Get current count value
{
return count;
}
inline
cyg_bool waiting_to_get() // Any threads waiting?
{
return ! get_threadq.empty();
}
inline
cyg_bool waiting_to_put() // Any threads waiting?
{
#ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
return ! put_threadq.empty();
#else
return false;
#endif
}
};
// -------------------------------------------------------------------------
#endif // ifndef CYGONCE_KERNEL_MBOXT2_HXX
// EOF mboxt2.hxx
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