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/_semaphore.h

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    1 /*-
    2  * Copyright (c) 2002 Alfred Perlstein <alfred@FreeBSD.org>
    3  * 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  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  *      $FreeBSD: releng/8.1/sys/sys/_semaphore.h 199583 2009-11-20 15:27:52Z jhb $
   27  */
   28 #ifndef __SEMAPHORE_H_
   29 #define __SEMAPHORE_H_
   30 
   31 typedef intptr_t semid_t;
   32 struct timespec;
   33 
   34 #ifndef _KERNEL
   35 
   36 #include <sys/cdefs.h>
   37 
   38 /*
   39  * Semaphore definitions.
   40  */
   41 struct sem {
   42 #define SEM_MAGIC       ((u_int32_t) 0x09fa4012)
   43         u_int32_t       magic;
   44         pthread_mutex_t lock;
   45         pthread_cond_t  gtzero;
   46         u_int32_t       count;
   47         u_int32_t       nwaiters;
   48 #define SEM_USER        (NULL)
   49         semid_t         semid;  /* semaphore id if kernel (shared) semaphore */
   50         int             syssem; /* 1 if kernel (shared) semaphore */
   51         LIST_ENTRY(sem) entry;
   52         struct sem      **backpointer;
   53 };
   54 
   55 __BEGIN_DECLS
   56 
   57 int ksem_close(semid_t id);
   58 int ksem_post(semid_t id);
   59 int ksem_wait(semid_t id);
   60 int ksem_trywait(semid_t id);
   61 int ksem_timedwait(semid_t id, const struct timespec *abstime);
   62 int ksem_init(semid_t *idp, unsigned int value);
   63 int ksem_open(semid_t *idp, const char *name, int oflag, mode_t mode,
   64     unsigned int value);
   65 int ksem_unlink(const char *name);
   66 int ksem_getvalue(semid_t id, int *val);
   67 int ksem_destroy(semid_t id);
   68 
   69 __END_DECLS
   70 
   71 #endif /* !_KERNEL */
   72 
   73 #endif /* __SEMAPHORE_H_ */

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