2013-12-04 16:06:17 +00:00
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2002 by Björn Stenberg
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef SEMAPHORE_H
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#define SEMAPHORE_H
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#include "thread.h"
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struct semaphore
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{
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2014-08-08 10:33:51 +00:00
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struct __wait_queue queue; /* Waiter list */
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int volatile count; /* # of waits remaining before unsignaled */
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int max; /* maximum # of waits to remain signaled */
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IF_COP( struct corelock cl; ) /* multiprocessor sync */
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2013-12-04 16:06:17 +00:00
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};
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extern void semaphore_init(struct semaphore *s, int max, int start);
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extern int semaphore_wait(struct semaphore *s, int timeout);
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extern void semaphore_release(struct semaphore *s);
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#endif /* SEMAPHORE_H */
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