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ucos2_semaphore.h
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/**
* \file ucos2_semaphore.h
* \author Wei Yongming <vincent@minigui.org>
* \date 2004/02/03
*
* \brief This header contains the POSIX semaphore definitions
* needed to support MiniGUI under uC/OS-II.
*
\verbatim
This file is part of MiniGUI, a mature cross-platform windowing
and Graphics User Interface (GUI) support system for embedded systems
and smart IoT devices.
Copyright (C) 2002~2018, Beijing FMSoft Technologies Co., Ltd.
Copyright (C) 1998~2002, WEI Yongming
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 3 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, see <http://www.gnu.org/licenses/>.
Or,
As this program is a library, any link to this program must follow
GNU General Public License version 3 (GPLv3). If you cannot accept
GPLv3, you need to be licensed from FMSoft.
If you have got a commercial license of this program, please use it
under the terms and conditions of the commercial license.
For more information about the commercial license, please refer to
<http://www.minigui.com/en/about/licensing-policy/>.
\endverbatim
*/
/*
* $Id: ucos2_semaphore.h 11349 2009-03-02 05:00:43Z weiym $
*
* MiniGUI for Linux/uClinux, eCos, uC/OS-II, VxWorks,
* pSOS, ThreadX, NuCleus, OSE, and Win32.
*/
#ifndef UCOSII_SEMAPHORE_H
#define UCOSII_SEMAPHORE_H
#ifdef __UCOSII__
#define sem_t ucos2_sem_t
#define SEM_VALUE_MAX USHRT_MAX
/*-----------------------------------------------------------------------------
** Semaphore object definition
*/
typedef 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 value */
int sem_getvalue (sem_t *sem, int *sval);
/* We do not implement the named semaphore functions */
#if 0
/*-----------------------------------------------------------------------------
** 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 semaphore */
int sem_unlink (const char *name);
/*-----------------------------------------------------------------------------
** Special return value for sem_open()
*/
#define SEM_FAILED ((sem_t *)NULL)
/* We do not implement the named semaphore functions */
#endif
#endif /* __UCOSII__ */
#endif /* UCOSII_SEMAPHORE_H */