/** * \file semaphore.h * \author Wei Yongming <ymwei@minigui.org> * \date 2004/02/03 *  * semaphore.h: This header contains the pthread semaphore definitions  *              needed to support MiniGUI under uC/OS-II.  * \verbatim    Copyright (C) 2004 Feynman Software.    This file is part of MiniGUI, a lightweight Graphics User Interface     support library for real-time embedded Linux.    This program 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 of the License, or    (at your option) any later version.    This program 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 this program; if not, write to the Free Software    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA \endverbatim *//* * $Id: ucos2_semaphore.h,v 1.2 2004/02/25 02:34:49 weiym Exp $ * *             MiniGUI for Linux, uClinux, eCos, and uC/OS-II version 1.5.x *             Copyright (C) 1998-2002 Wei Yongming. *             Copyright (C) 2002-2004 Feynman Software. */#ifndef UCOSII_SEMAPHORE_H#define UCOSII_SEMAPHORE_H#include "common.h"#ifdef __UCOSII__#define sem_t ucos2_sem_t#define SEM_VALUE_MAX	USHRT_MAX//-----------------------------------------------------------------------------// Semaphore object definitiontypedef struct{    void* os_sema;} sem_t;//-----------------------------------------------------------------------------// Semaphore functions// Initialize semaphore to value.// pshared is not supported under uC/OS-II.int sem_init  (sem_t *sem, int pshared, unsigned int value);// Destroy the semaphore.int sem_destroy  (sem_t *sem);// Decrement value if >0 or wait for a post.int sem_wait  (sem_t *sem);// Decrement value if >0, return -1 if not.int sem_trywait  (sem_t *sem);// Increment value and wake a waiter if one is present.int sem_post  (sem_t *sem);// Get current valueint sem_getvalue  (sem_t *sem, int *sval);#if 0 /* We do not implement the named semaphore functions *///-----------------------------------------------------------------------------// Named semaphore functions// Open an existing named semaphore, or create it.sem_t *sem_open  (const char *name, int oflag, ...);// Close descriptor for semaphore.int sem_close  (sem_t *sem);// Remove named semaphoreint sem_unlink  (const char *name);//-----------------------------------------------------------------------------// Special return value for sem_open()#define SEM_FAILED      ((sem_t *)NULL)#endif /* We do not implement the named semaphore functions */#endif /* __UCOSII__ */#endif /* UCOSII_SEMAPHORE_H */