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/posix4/semaphore.h

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    1 #ifndef _SEMAPHORE_H_
    2 #define _SEMAPHORE_H_
    3 
    4 /* semaphore.h: POSIX 1003.1b semaphores */
    5 
    6 /*-
    7  * Copyright (c) 1996, 1997
    8  *      HD Associates, Inc.  All rights reserved.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by HD Associates, Inc
   21  * 4. Neither the name of the author nor the names of any co-contributors
   22  *    may be used to endorse or promote products derived from this software
   23  *    without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
   29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  * $FreeBSD$
   38  */
   39 
   40 #include <sys/_posix.h>
   41 #include <machine/limits.h>
   42 
   43 #ifdef _P1003_1B_INCLUDE_MAYBES
   44 #include <sys/types.h>
   45 #include <fcntl.h>
   46 #endif
   47 
   48 /* Opaque type definition. */
   49 struct sem;
   50 typedef struct sem *sem_t;
   51 
   52 #define SEM_FAILED      ((sem_t *)0)
   53 #define SEM_VALUE_MAX   UINT_MAX
   54 
   55 #ifndef _KERNEL
   56 #include <sys/cdefs.h>
   57 
   58 __BEGIN_DECLS
   59 int      sem_init __P((sem_t *, int, unsigned int));
   60 int      sem_destroy __P((sem_t *));
   61 sem_t   *sem_open __P((const char *, int, ...));
   62 int      sem_close __P((sem_t *));
   63 int      sem_unlink __P((const char *));
   64 int      sem_wait __P((sem_t *));
   65 int      sem_trywait __P((sem_t *));
   66 int      sem_post __P((sem_t *));
   67 int      sem_getvalue __P((sem_t *, int *));
   68 __END_DECLS
   69 
   70 #endif
   71 
   72 #endif /* _SEMAPHORE_H_ */

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