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      1 /*
      2  * Copyright (C) 2008 The Android Open Source Project
      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  *  * Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  *  * Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 #ifndef _SEMAPHORE_H
     29 #define _SEMAPHORE_H
     30 
     31 #include <sys/cdefs.h>
     32 
     33 __BEGIN_DECLS
     34 
     35 typedef struct {
     36   volatile unsigned int count;
     37 #ifdef __LP64__
     38   int __reserved[3];
     39 #endif
     40 } sem_t;
     41 
     42 #define SEM_FAILED NULL
     43 
     44 extern int sem_init(sem_t *sem, int pshared, unsigned int value);
     45 
     46 extern int    sem_close(sem_t *);
     47 extern int    sem_destroy(sem_t *);
     48 extern int    sem_getvalue(sem_t *, int *);
     49 extern int    sem_init(sem_t *, int, unsigned int);
     50 extern sem_t *sem_open(const char *, int, ...);
     51 extern int    sem_post(sem_t *);
     52 extern int    sem_trywait(sem_t *);
     53 extern int    sem_unlink(const char *);
     54 extern int    sem_wait(sem_t *);
     55 
     56 struct timespec;
     57 extern int    sem_timedwait(sem_t *sem, const struct timespec *abs_timeout);
     58 
     59 __END_DECLS
     60 
     61 #endif /* _SEMAPHORE_H */
     62