The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/sema.h

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    1 /*-
    2  * Copyright (C) 2001 Jason Evans <jasone@freebsd.org>.  All rights reserved.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice(s), this list of conditions and the following disclaimer as
    9  *    the first lines of this file unmodified other than the possible
   10  *    addition of one or more copyright notices.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice(s), this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
   16  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   17  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   18  * DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
   19  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   20  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   22  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
   25  * DAMAGE.
   26  *
   27  * $FreeBSD: releng/6.2/sys/sys/sema.h 164286 2006-11-14 20:42:41Z cvs2svn $
   28  */
   29 
   30 #ifndef _SYS_SEMA_H_
   31 #define _SYS_SEMA_H_
   32 
   33 #include <sys/queue.h>
   34 #include <sys/_lock.h>
   35 #include <sys/_mutex.h>
   36 #include <sys/condvar.h>
   37 
   38 struct sema {
   39         struct mtx      sema_mtx;       /* General protection lock. */
   40         struct cv       sema_cv;        /* Waiters. */
   41         int             sema_waiters;   /* Number of waiters. */
   42         int             sema_value;     /* Semaphore value. */
   43 };
   44 
   45 #ifdef _KERNEL
   46 void    sema_init(struct sema *sema, int value, const char *description);
   47 void    sema_destroy(struct sema *sema);
   48 void    _sema_post(struct sema *sema, const char *file, int line);
   49 void    _sema_wait(struct sema *sema, const char *file, int line);
   50 int     _sema_timedwait(struct sema *sema, int timo, const char *file, int
   51     line);
   52 int     _sema_trywait(struct sema *sema, const char *file, int line);
   53 int     sema_value(struct sema *sema);
   54 
   55 #define sema_post(sema)         _sema_post((sema), LOCK_FILE, LOCK_LINE)
   56 #define sema_wait(sema)         _sema_wait((sema), LOCK_FILE, LOCK_LINE)
   57 #define sema_timedwait(sema, timo)                                      \
   58         _sema_timedwait((sema), (timo), LOCK_FILE, LOCK_LINE)
   59 #define sema_trywait(sema)      _sema_trywait((sema), LOCK_FILE, LOCK_LINE)
   60 
   61 #endif  /* _KERNEL */
   62 #endif  /* _SYS_SEMA_H_ */

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