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1 | /* |
1 | /* |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
2 | * Copyright (C) 2001-2004 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | #ifndef __RWLOCK_H__ |
29 | #ifndef __RWLOCK_H__ |
30 | #define __RWLOCK_H__ |
30 | #define __RWLOCK_H__ |
31 | 31 | ||
32 | #include <arch/types.h> |
32 | #include <arch/types.h> |
33 | #include <typedefs.h> |
33 | #include <typedefs.h> |
34 | #include <synch/mutex.h> |
34 | #include <synch/mutex.h> |
35 | #include <synch/synch.h> |
35 | #include <synch/synch.h> |
36 | #include <synch/spinlock.h> |
36 | #include <synch/spinlock.h> |
37 | 37 | ||
38 | enum rwlock_type { |
38 | enum rwlock_type { |
39 | RWLOCK_NONE, |
39 | RWLOCK_NONE, |
40 | RWLOCK_READER, |
40 | RWLOCK_READER, |
41 | RWLOCK_WRITER |
41 | RWLOCK_WRITER |
42 | }; |
42 | }; |
43 | 43 | ||
44 | struct rwlock { |
44 | struct rwlock { |
45 | SPINLOCK_DECLARE(lock); |
45 | SPINLOCK_DECLARE(lock); |
46 | mutex_t exclusive; /**< Mutex for writers, readers can bypass it if readers_in is positive. */ |
46 | mutex_t exclusive; /**< Mutex for writers, readers can bypass it if readers_in is positive. */ |
47 | count_t readers_in; /**< Number of readers in critical section. */ |
47 | count_t readers_in; /**< Number of readers in critical section. */ |
48 | }; |
48 | }; |
49 | 49 | ||
50 | #define rwlock_write_lock(rwl) \ |
50 | #define rwlock_write_lock(rwl) \ |
51 | _rwlock_write_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_BLOCKING) |
51 | _rwlock_write_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NONE) |
52 | #define rwlock_read_lock(rwl) \ |
52 | #define rwlock_read_lock(rwl) \ |
53 | _rwlock_read_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_BLOCKING) |
53 | _rwlock_read_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NONE) |
54 | #define rwlock_write_trylock(rwl) \ |
54 | #define rwlock_write_trylock(rwl) \ |
55 | _rwlock_write_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_NON_BLOCKING) |
55 | _rwlock_write_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NON_BLOCKING) |
56 | #define rwlock_read_trylock(rwl) \ |
56 | #define rwlock_read_trylock(rwl) \ |
57 | _rwlock_read_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_NON_BLOCKING) |
57 | _rwlock_read_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NON_BLOCKING) |
58 | #define rwlock_write_lock_timeout(rwl,usec) \ |
58 | #define rwlock_write_lock_timeout(rwl,usec) \ |
59 | _rwlock_write_lock_timeout((rwl),(usec),SYNCH_NON_BLOCKING) |
59 | _rwlock_write_lock_timeout((rwl),(usec),SYNCH_FLAGS_NONE) |
60 | #define rwlock_read_lock_timeout(rwl,usec) \ |
60 | #define rwlock_read_lock_timeout(rwl,usec) \ |
61 | _rwlock_read_lock_timeout((rwl),(usec),SYNCH_NON_BLOCKING) |
61 | _rwlock_read_lock_timeout((rwl),(usec),SYNCH_FLAGS_NONE) |
62 | 62 | ||
63 | extern void rwlock_initialize(rwlock_t *rwl); |
63 | extern void rwlock_initialize(rwlock_t *rwl); |
64 | extern void rwlock_read_unlock(rwlock_t *rwl); |
64 | extern void rwlock_read_unlock(rwlock_t *rwl); |
65 | extern void rwlock_write_unlock(rwlock_t *rwl); |
65 | extern void rwlock_write_unlock(rwlock_t *rwl); |
66 | extern int _rwlock_read_lock_timeout(rwlock_t *rwl, __u32 usec, int trylock); |
66 | extern int _rwlock_read_lock_timeout(rwlock_t *rwl, __u32 usec, int flags); |
67 | extern int _rwlock_write_lock_timeout(rwlock_t *rwl, __u32 usec, int trylock); |
67 | extern int _rwlock_write_lock_timeout(rwlock_t *rwl, __u32 usec, int flags); |
68 | 68 | ||
69 | #endif |
69 | #endif |
- | 70 | ||
70 | 71 |