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 /*-
    2  * Copyright (c) 1996, 1997
    3  *      HD Associates, Inc.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 3. All advertising materials mentioning features or use of this software
   14  *    must display the following acknowledgement:
   15  *      This product includes software developed by HD Associates, Inc
   16  * 4. Neither the name of the author nor the names of any co-contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY HD ASSOCIATES AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL HD ASSOCIATES OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  * $FreeBSD: src/sys/posix4/semaphore.h,v 1.11 2004/02/03 22:27:03 deischen Exp $
   33  */
   34 
   35 /* semaphore.h: POSIX 1003.1b semaphores */
   36 
   37 #ifndef _SEMAPHORE_H_
   38 #define _SEMAPHORE_H_
   39 
   40 /* Opaque type definition. */
   41 struct sem;
   42 typedef struct sem *    sem_t;
   43 
   44 #define SEM_FAILED      ((sem_t *)0)
   45 #define SEM_VALUE_MAX   (~0U)           /* Equivalent to UINT_MAX. */
   46 
   47 #ifndef _KERNEL
   48 #include <sys/cdefs.h>
   49 
   50 struct timespec;
   51 
   52 __BEGIN_DECLS
   53 int      sem_close(sem_t *);
   54 int      sem_destroy(sem_t *);
   55 int      sem_getvalue(sem_t * __restrict, int * __restrict);
   56 int      sem_init(sem_t *, int, unsigned int);
   57 sem_t   *sem_open(const char *, int, ...);
   58 int      sem_post(sem_t *);
   59 int      sem_timedwait(sem_t * __restrict, const struct timespec * __restrict);
   60 int      sem_trywait(sem_t *);
   61 int      sem_unlink(const char *);
   62 int      sem_wait(sem_t *);
   63 __END_DECLS
   64 
   65 #endif
   66 
   67 #endif /* !_SEMAPHORE_H_ */

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