| 1 | /*
|
|---|
| 2 | * Copyright (C) 2001-2004 Jakub Jermar
|
|---|
| 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 | *
|
|---|
| 9 | * - Redistributions of source code must retain the above copyright
|
|---|
| 10 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | * - Redistributions in binary form must reproduce the above copyright
|
|---|
| 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.
|
|---|
| 16 | *
|
|---|
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | */
|
|---|
| 28 |
|
|---|
| 29 | #ifndef __SEMAPHORE_H__
|
|---|
| 30 | #define __SEMAPHORE_H__
|
|---|
| 31 |
|
|---|
| 32 | #include <arch/types.h>
|
|---|
| 33 | #include <typedefs.h>
|
|---|
| 34 | #include <synch/waitq.h>
|
|---|
| 35 | #include <synch/synch.h>
|
|---|
| 36 |
|
|---|
| 37 | struct semaphore
|
|---|
| 38 | {
|
|---|
| 39 | waitq_t wq;
|
|---|
| 40 | };
|
|---|
| 41 |
|
|---|
| 42 | #define semaphore_down(s) \
|
|---|
| 43 | _semaphore_down_timeout((s),SYNCH_NO_TIMEOUT,SYNCH_BLOCKING)
|
|---|
| 44 | #define semaphore_trydown(s) \
|
|---|
| 45 | _semaphore_down_timeout((s),SYNCH_NO_TIMEOUT,SYNCH_NON_BLOCKING)
|
|---|
| 46 | #define semaphore_down_timeout(s,usec) \
|
|---|
| 47 | _semaphore_down_timeout((s),(usec),SYNCH_NON_BLOCKING)
|
|---|
| 48 |
|
|---|
| 49 | extern void semaphore_initialize(semaphore_t *s, int val);
|
|---|
| 50 | extern int _semaphore_down_timeout(semaphore_t *s, __u32 usec, int trydown);
|
|---|
| 51 | extern void semaphore_up(semaphore_t *s);
|
|---|
| 52 |
|
|---|
| 53 | #endif
|
|---|
