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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 | #include <synch/semaphore.h> |
29 | #include <synch/semaphore.h> |
30 | #include <synch/waitq.h> |
30 | #include <synch/waitq.h> |
31 | #include <synch/spinlock.h> |
31 | #include <synch/spinlock.h> |
32 | #include <synch/synch.h> |
32 | #include <synch/synch.h> |
33 | #include <arch/asm.h> |
33 | #include <arch/asm.h> |
34 | #include <arch.h> |
34 | #include <arch.h> |
35 | 35 | ||
36 | /** Initialize semaphore |
36 | /** Initialize semaphore |
37 | * |
37 | * |
38 | * Initialize semaphore. |
38 | * Initialize semaphore. |
39 | * |
39 | * |
40 | * @param s Semaphore. |
40 | * @param s Semaphore. |
41 | * @param val Maximal number of threads allowed to enter critical section. |
41 | * @param val Maximal number of threads allowed to enter critical section. |
42 | */ |
42 | */ |
43 | void semaphore_initialize(semaphore_t *s, int val) |
43 | void semaphore_initialize(semaphore_t *s, int val) |
44 | { |
44 | { |
45 | pri_t pri; |
45 | ipl_t ipl; |
46 | 46 | ||
47 | waitq_initialize(&s->wq); |
47 | waitq_initialize(&s->wq); |
48 | 48 | ||
49 | pri = cpu_priority_high(); |
49 | ipl = interrupts_disable(); |
50 | 50 | ||
51 | spinlock_lock(&s->wq.lock); |
51 | spinlock_lock(&s->wq.lock); |
52 | s->wq.missed_wakeups = val; |
52 | s->wq.missed_wakeups = val; |
53 | spinlock_unlock(&s->wq.lock); |
53 | spinlock_unlock(&s->wq.lock); |
54 | 54 | ||
55 | cpu_priority_restore(pri); |
55 | interrupts_restore(ipl); |
56 | } |
56 | } |
57 | 57 | ||
58 | /** Semaphore down |
58 | /** Semaphore down |
59 | * |
59 | * |
60 | * Semaphore down. |
60 | * Semaphore down. |
61 | * Conditional mode and mode with timeout can be requested. |
61 | * Conditional mode and mode with timeout can be requested. |
62 | * |
62 | * |
63 | * @param s Semaphore. |
63 | * @param s Semaphore. |
64 | * @param usec Timeout in microseconds. |
64 | * @param usec Timeout in microseconds. |
65 | * @param trydown Switches between blocking and non-blocking mode. |
65 | * @param trydown Switches between blocking and non-blocking mode. |
66 | * |
66 | * |
67 | * For exact description of possible combinations of |
67 | * For exact description of possible combinations of |
68 | * 'usec' and 'trydown', see comment for waitq_sleep_timeout(). |
68 | * 'usec' and 'trydown', see comment for waitq_sleep_timeout(). |
69 | * |
69 | * |
70 | * @return See comment for waitq_sleep_timeout(). |
70 | * @return See comment for waitq_sleep_timeout(). |
71 | */ |
71 | */ |
72 | int _semaphore_down_timeout(semaphore_t *s, __u32 usec, int trydown) |
72 | int _semaphore_down_timeout(semaphore_t *s, __u32 usec, int trydown) |
73 | { |
73 | { |
74 | return waitq_sleep_timeout(&s->wq, usec, trydown); |
74 | return waitq_sleep_timeout(&s->wq, usec, trydown); |
75 | } |
75 | } |
76 | 76 | ||
77 | /** Semaphore up |
77 | /** Semaphore up |
78 | * |
78 | * |
79 | * Semaphore up. |
79 | * Semaphore up. |
80 | * |
80 | * |
81 | * @param s Semaphore. |
81 | * @param s Semaphore. |
82 | */ |
82 | */ |
83 | void semaphore_up(semaphore_t *s) |
83 | void semaphore_up(semaphore_t *s) |
84 | { |
84 | { |
85 | waitq_wakeup(&s->wq, WAKEUP_FIRST); |
85 | waitq_wakeup(&s->wq, WAKEUP_FIRST); |
86 | } |
86 | } |
87 | 87 |