usr/src/head/semaphore.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2014 Garrett D'Amore <garrett@damore.org>
  24  *
  25  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28
  29 #ifndef _SEMAPHORE_H
  30 #define _SEMAPHORE_H
  31
  32 #include <sys/feature_tests.h>
  33
  34 #include <sys/types.h>
  35 #include <sys/fcntl.h>
  36
  37 #ifdef  __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 typedef struct {
  42         /* this structure must be the same as sema_t in <synch.h> */
  43         uint32_t        sem_count;      /* semaphore count */
  44         uint16_t        sem_type;
  45         uint16_t        sem_magic;
  46         upad64_t        sem_pad1[3];    /* reserved for a mutex_t */
  47         upad64_t        sem_pad2[2];    /* reserved for a cond_t */
  48 } sem_t;
  49
  50 #define SEM_FAILED      ((sem_t *)(-1))
  51
  52 /*
  53  * function prototypes
  54  */
  55 int     sem_init(sem_t *, int, unsigned int);
  56 int     sem_destroy(sem_t *);
  57 sem_t   *sem_open(const char *, int, ...);
  58 int     sem_close(sem_t *);
  59 int     sem_unlink(const char *);
  60 int     sem_wait(sem_t *);
  61 /*
  62  * Inclusion of <time.h> breaks X/Open and POSIX namespace.
  63  * The timespec structure while allowed in XPG6 and POSIX.1003d-1999,
  64  * is not permitted in prior POSIX or X/Open specifications even
  65  * though functions beginning with sem_* are allowed.
  66  */
  67 #if !defined(__XOPEN_OR_POSIX) || defined(_XPG6) || defined(__EXTENSIONS__)
  68 struct timespec;
  69 int     sem_timedwait(sem_t *_RESTRICT_KYWD,
  70                 const struct timespec *_RESTRICT_KYWD);
  71 int     sem_reltimedwait_np(sem_t *_RESTRICT_KYWD,
  72                 const struct timespec *_RESTRICT_KYWD);
  73 #endif  /* !defined(__XOPEN_OR_POSIX) || defined(_XPG6) ... */
  74 int     sem_trywait(sem_t *);
  75 int     sem_post(sem_t *);
  76 int     sem_getvalue(sem_t *_RESTRICT_KYWD, int *_RESTRICT_KYWD);
  77
  78 #ifdef  __cplusplus
  79 }
  80 #endif
  81
  82 #endif  /* _SEMAPHORE_H */