2 * Copyright (C) 2001 Jason Evans <jasone@freebsd.org>. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice(s), this list of conditions and the following disclaimer as
9 * the first lines of this file unmodified other than the possible
10 * addition of one or more copyright notices.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice(s), this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
18 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
19 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
33 #include <sys/queue.h>
34 #include <sys/_lock.h>
35 #include <sys/_mutex.h>
36 #include <sys/condvar.h>
39 struct mtx sema_mtx; /* General protection lock. */
40 struct cv sema_cv; /* Waiters. */
41 int sema_waiters; /* Number of waiters. */
42 int sema_value; /* Semaphore value. */
46 void sema_init(struct sema *sema, int value, const char *description);
47 void sema_destroy(struct sema *sema);
48 void _sema_post(struct sema *sema, const char *file, int line);
49 void _sema_wait(struct sema *sema, const char *file, int line);
50 int _sema_timedwait(struct sema *sema, int timo, const char *file, int
52 int _sema_trywait(struct sema *sema, const char *file, int line);
53 int sema_value(struct sema *sema);
55 #define sema_post(sema) _sema_post((sema), LOCK_FILE, LOCK_LINE)
56 #define sema_wait(sema) _sema_wait((sema), LOCK_FILE, LOCK_LINE)
57 #define sema_timedwait(sema, timo) \
58 _sema_timedwait((sema), (timo), LOCK_FILE, LOCK_LINE)
59 #define sema_trywait(sema) _sema_trywait((sema), LOCK_FILE, LOCK_LINE)
62 #endif /* _SYS_SEMA_H_ */