/* * Copyright (C) 2000-2004 by ETH Zurich * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 3. Neither the name of the copyright holders nor the names of *    contributors may be used to endorse or promote products derived *    from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY ETH ZURICH AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ETH ZURICH * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * For additional information see http://www.ethernut.de/ * *//* sempahore.h - a nut/os implementation of semaphore functions * * 2004.05.06 Matthias Ringwald <matthias.ringwald@inf.ethz.ch> * *//* * $Log: semaphore.h,v $ * Revision 1.4  2005/08/02 17:46:49  haraldkipp * Major API documentation update. * * Revision 1.3  2004/06/02 16:43:36  olereinhardt * fixed bug (integer overflow) in semaphore implementation * * Revision 1.2  2004/05/18 18:38:14  drsung * Added $Log keyword for CVS and avoid multiple inclusion of header file. * */ #ifndef _SYS_SEMAPHORE_H#define _SYS_SEMAPHORE_H#include <sys/types.h>#include <sys/thread.h>/*! * \addtogroup xgSemaphore *//*@{*/#ifdef __cplusplusextern "C" {#endif/*! * \brief Sempahore type. */    typedef struct _SEM SEM;/*! * \struct _mutex mutex.h sys/mutex.h * \brief Recursive mutex. * */    struct _SEM {        HANDLE qhp;           /*!< \brief Queue to wait, if semaphore is zero. */        short value;          /*!< \brief semaphore value . */    };    extern void NutSemInit(SEM * sem, short value);    extern void NutSemWait(SEM * sem);    extern int NutSemTryWait(SEM * sem);    extern void NutSemPost(SEM * sem);    extern int NutSemDestroy(SEM * sem);#ifdef __cplusplus}#endif/*@}*/#endif /* #ifndef _SYS_SEMAPHORE_H */