53 lines
2.0 KiB
C
53 lines
2.0 KiB
C
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/* Copyright (c) 2016 Phoenix Systems
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.*/
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#ifndef SEMAPHORE_H
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#define SEMAPHORE_H
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#include <time.h>
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/* System specific semaphore definition. */
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typedef struct {
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int fd;
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} sem_t;
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/* Value returned if `sem_open' failed. */
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#define SEM_FAILED ((sem_t *) 0)
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/* Maximum value the semaphore can have. */
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#define SEM_VALUE_MAX (2147483647)
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int sem_init(sem_t *sem, int pshared, unsigned int value);
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int sem_destroy(sem_t *sem);
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sem_t *sem_open(const char *name, int oflag, ...);
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int sem_close(sem_t *sem);
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int sem_unlink(const char *name);
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int sem_wait(sem_t *sem);
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int sem_timedwait(sem_t *sem, const struct timespec *abs_timeout);
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int sem_trywait(sem_t *sem);
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int sem_post(sem_t *sem);
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int sem_getvalue(sem_t * sem, int *sval);
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#endif
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