2 * Copyright (c) 2001-2004 Jakub Jermar
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
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12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #ifndef KERN_SEMAPHORE_H_
36 #define KERN_SEMAPHORE_H_
38 #include <arch/types.h>
39 #include <synch/waitq.h>
40 #include <synch/synch.h>
46 #define semaphore_down(s) \
47 _semaphore_down_timeout((s), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
48 #define semaphore_trydown(s) \
49 _semaphore_down_timeout((s), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NON_BLOCKING)
50 #define semaphore_down_timeout(s, usec) \
51 _semaphore_down_timeout((s), (usec), SYNCH_FLAGS_NONE)
53 extern void semaphore_initialize(semaphore_t
*s
, int val
);
54 extern int _semaphore_down_timeout(semaphore_t
*s
, uint32_t usec
, int flags
);
55 extern void semaphore_up(semaphore_t
*s
);