Rev 1264 | Rev 1702 | Go to most recent revision | Only display areas with differences | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed
Rev 1264 | Rev 1502 | ||
---|---|---|---|
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 | /** |
29 | /** |
30 | * @file semaphore.c |
30 | * @file semaphore.c |
31 | * @brief Semaphores. |
31 | * @brief Semaphores. |
32 | */ |
32 | */ |
33 | 33 | ||
34 | #include <synch/semaphore.h> |
34 | #include <synch/semaphore.h> |
35 | #include <synch/waitq.h> |
35 | #include <synch/waitq.h> |
36 | #include <synch/spinlock.h> |
36 | #include <synch/spinlock.h> |
37 | #include <synch/synch.h> |
37 | #include <synch/synch.h> |
38 | #include <arch/asm.h> |
38 | #include <arch/asm.h> |
39 | #include <arch.h> |
39 | #include <arch.h> |
40 | 40 | ||
41 | /** Initialize semaphore |
41 | /** Initialize semaphore |
42 | * |
42 | * |
43 | * Initialize semaphore. |
43 | * Initialize semaphore. |
44 | * |
44 | * |
45 | * @param s Semaphore. |
45 | * @param s Semaphore. |
46 | * @param val Maximal number of threads allowed to enter critical section. |
46 | * @param val Maximal number of threads allowed to enter critical section. |
47 | */ |
47 | */ |
48 | void semaphore_initialize(semaphore_t *s, int val) |
48 | void semaphore_initialize(semaphore_t *s, int val) |
49 | { |
49 | { |
50 | ipl_t ipl; |
50 | ipl_t ipl; |
51 | 51 | ||
52 | waitq_initialize(&s->wq); |
52 | waitq_initialize(&s->wq); |
53 | 53 | ||
54 | ipl = interrupts_disable(); |
54 | ipl = interrupts_disable(); |
55 | 55 | ||
56 | spinlock_lock(&s->wq.lock); |
56 | spinlock_lock(&s->wq.lock); |
57 | s->wq.missed_wakeups = val; |
57 | s->wq.missed_wakeups = val; |
58 | spinlock_unlock(&s->wq.lock); |
58 | spinlock_unlock(&s->wq.lock); |
59 | 59 | ||
60 | interrupts_restore(ipl); |
60 | interrupts_restore(ipl); |
61 | } |
61 | } |
62 | 62 | ||
63 | /** Semaphore down |
63 | /** Semaphore down |
64 | * |
64 | * |
65 | * Semaphore down. |
65 | * Semaphore down. |
66 | * Conditional mode and mode with timeout can be requested. |
66 | * Conditional mode and mode with timeout can be requested. |
67 | * |
67 | * |
68 | * @param s Semaphore. |
68 | * @param s Semaphore. |
69 | * @param usec Timeout in microseconds. |
69 | * @param usec Timeout in microseconds. |
70 | * @param trydown Switches between blocking and non-blocking mode. |
70 | * @param flags Select mode of operation. |
71 | * |
71 | * |
72 | * For exact description of possible combinations of |
72 | * For exact description of possible combinations of |
73 | * usec and trydown, see comment for waitq_sleep_timeout(). |
73 | * usec and flags, see comment for waitq_sleep_timeout(). |
74 | * |
74 | * |
75 | * @return See comment for waitq_sleep_timeout(). |
75 | * @return See comment for waitq_sleep_timeout(). |
76 | */ |
76 | */ |
77 | int _semaphore_down_timeout(semaphore_t *s, __u32 usec, int trydown) |
77 | int _semaphore_down_timeout(semaphore_t *s, __u32 usec, int flags) |
78 | { |
78 | { |
79 | return waitq_sleep_timeout(&s->wq, usec, trydown); |
79 | return waitq_sleep_timeout(&s->wq, usec, flags); |
80 | } |
80 | } |
81 | 81 | ||
82 | /** Semaphore up |
82 | /** Semaphore up |
83 | * |
83 | * |
84 | * Semaphore up. |
84 | * Semaphore up. |
85 | * |
85 | * |
86 | * @param s Semaphore. |
86 | * @param s Semaphore. |
87 | */ |
87 | */ |
88 | void semaphore_up(semaphore_t *s) |
88 | void semaphore_up(semaphore_t *s) |
89 | { |
89 | { |
90 | waitq_wakeup(&s->wq, WAKEUP_FIRST); |
90 | waitq_wakeup(&s->wq, WAKEUP_FIRST); |
91 | } |
91 | } |
92 | 92 |