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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [kernel/] [v2_0/] [include/] [sema.hxx] - Blame information for rev 332

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#ifndef CYGONCE_KERNEL_SEMA_HXX
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#define CYGONCE_KERNEL_SEMA_HXX
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//==========================================================================
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//
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//      sema.hxx
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//
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//      Semaphore class declarations
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//
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//==========================================================================
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//####ECOSGPLCOPYRIGHTBEGIN####
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// -------------------------------------------
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// This file is part of eCos, the Embedded Configurable Operating System.
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// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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//
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// eCos is free software; you can redistribute it and/or modify it under
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// the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 or (at your option) any later version.
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//
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// eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with eCos; if not, write to the Free Software Foundation, Inc.,
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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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//
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// As a special exception, if other files instantiate templates or use macros
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// or inline functions from this file, or you compile this file and link it
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// with other works to produce a work based on this file, this file does not
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// by itself cause the resulting work to be covered by the GNU General Public
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// License. However the source code for this file must still be made available
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// in accordance with section (3) of the GNU General Public License.
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//
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// This exception does not invalidate any other reasons why a work based on
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// this file might be covered by the GNU General Public License.
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//
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// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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// at http://sources.redhat.com/ecos/ecos-license/
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// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
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//==========================================================================
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//#####DESCRIPTIONBEGIN####
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//
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// Author(s):   nickg
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// Contributors:        nickg
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// Date:        1997-09-09
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// Purpose:     Define Semaphore class interfaces
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// Description: The classes defined here provide the APIs for binary
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//              and counting semaphores.
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// Usage:       #include 
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//
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//
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//####DESCRIPTIONEND####
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//
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//==========================================================================
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#include 
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#include          // assertion macros
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#include        // thread inlines
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// -------------------------------------------------------------------------
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// Binary semaphore. This has only two states: posted and not-posted.
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class Cyg_Binary_Semaphore
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{
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    cyg_bool            state;          // The binary semaphore state
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    Cyg_ThreadQueue     queue;          // Queue of waiting threads
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public:
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    CYGDBG_DEFINE_CHECK_THIS
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    Cyg_Binary_Semaphore(               // Constructor
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        cyg_bool init_state = false     // Initial state value
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        );
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    ~Cyg_Binary_Semaphore();            // Destructor
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    cyg_bool    wait();                 // Wait until state == true
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    cyg_bool    trywait();              // Set state false if possible
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    void        post();                 // Increment count
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    cyg_bool    posted();               // Get current state
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};
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// -------------------------------------------------------------------------
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// Counting semaphore. This implements the usual counter based semaphore.
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class Cyg_Counting_Semaphore
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{
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    cyg_count32         count;          // The semaphore count
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    Cyg_ThreadQueue     queue;          // Queue of waiting threads
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public:
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    CYGDBG_DEFINE_CHECK_THIS
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    Cyg_Counting_Semaphore(             // Constructor
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        cyg_count32 init_count = 0      // Initial count value
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        );
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    ~Cyg_Counting_Semaphore();          // Destructor
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    cyg_bool    wait();                 // Wait until decrement
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#ifdef CYGFUN_KERNEL_THREADS_TIMER
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    cyg_bool    wait( cyg_tick_count timeout );
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#endif                                  // Wait until decrement or timeout
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    cyg_bool    trywait();              // Try to decrement
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    void        post();                 // Increment count
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    cyg_count32 peek() const;           // Get current count value
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    inline
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    cyg_bool    waiting()               // Is anyone waiting?
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    {
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        return !queue.empty();
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    }
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};
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// -------------------------------------------------------------------------
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#endif // ifndef CYGONCE_KERNEL_SEMA_HXX
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// EOF sema.hxx

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