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#ifndef CYGONCE_SEMAPHORE_H
#define CYGONCE_SEMAPHORE_H
//=============================================================================
//
// semaphore.h
//
// POSIX semaphore header
//
//=============================================================================
// ####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): nickg
// Contributors: nickg
// Date: 2000-03-17
// Purpose: POSIX semaphore header
// Description: This header contains all the definitions needed to support
// semaphores under eCos. The reader is referred to the POSIX
// standard or equivalent documentation for details of the
// functionality contained herein.
//
// Usage:
// #include <semaphore.h>
// ...
//
//
//####DESCRIPTIONEND####
//
//=============================================================================
#include <pkgconf/hal.h>
#include <pkgconf/kernel.h>
#include <pkgconf/posix.h>
#include <stddef.h> // NULL, size_t
#include <limits.h>
#include <sys/types.h>
//-----------------------------------------------------------------------------
// Semaphore object definition
// This structure must exactly correspond in size and layout to the underlying
// eCos C++ class that implements this object.
typedef struct
{
CYG_WORD32 sem_value;
CYG_ADDRESS sem_queue;
} sem_t;
//-----------------------------------------------------------------------------
// Semaphore functions
// Initialize semaphore to value.
// pshared is not supported under eCos.
externC int sem_init (sem_t *sem, int pshared, unsigned int value);
// Destroy the semaphore.
externC int sem_destroy (sem_t *sem);
// Decrement value if >0 or wait for a post.
externC int sem_wait (sem_t *sem);
// Decrement value if >0, return -1 if not.
externC int sem_trywait (sem_t *sem);
// Increment value and wake a waiter if one is present.
externC int sem_post (sem_t *sem);
// Get current value
externC int sem_getvalue (sem_t *sem, int *sval);
//-----------------------------------------------------------------------------
// Named semaphore functions
// These are an optional feature under eCos
// Open an existing named semaphore, or create it.
externC sem_t *sem_open (const char *name, int oflag, ...);
// Close descriptor for semaphore.
externC int sem_close (sem_t *sem);
// Remove named semaphore
externC int sem_unlink (const char *name);
//-----------------------------------------------------------------------------
// Special return value for sem_open()
#define SEM_FAILED ((sem_t *)NULL)
//-----------------------------------------------------------------------------
#endif // ifndef CYGONCE_SEMAPHORE_H
// End of semaphore.h
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