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1 | /* sem_timedwait -- wait on a semaphore. SPARC version. | |
2 | Copyright (C) 2003-2014 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <sysdep.h> | |
22 | #include <lowlevellock.h> | |
23 | #include <internaltypes.h> | |
24 | #include <semaphore.h> | |
25 | ||
26 | #include <pthreadP.h> | |
27 | #include <shlib-compat.h> | |
28 | ||
29 | ||
30 | extern void __sem_wait_cleanup (void *arg) attribute_hidden; | |
31 | ||
32 | /* This is in a seperate function in order to make sure gcc | |
33 | puts the call site into an exception region, and thus the | |
34 | cleanups get properly run. */ | |
35 | static int | |
36 | __attribute__ ((noinline)) | |
37 | do_futex_timed_wait (struct sparc_new_sem *isem, struct timespec *rt) | |
38 | { | |
39 | int err, oldtype = __pthread_enable_asynccancel (); | |
40 | ||
41 | err = lll_futex_timed_wait (&isem->value, 0, rt, | |
42 | isem->private ^ FUTEX_PRIVATE_FLAG); | |
43 | ||
44 | __pthread_disable_asynccancel (oldtype); | |
45 | return err; | |
46 | } | |
47 | ||
48 | int | |
49 | sem_timedwait (sem_t *sem, const struct timespec *abstime) | |
50 | { | |
51 | struct sparc_new_sem *isem = (struct sparc_new_sem *) sem; | |
52 | int err; | |
53 | int val; | |
54 | ||
55 | if (__atomic_is_v9) | |
56 | val = atomic_decrement_if_positive (&isem->value); | |
57 | else | |
58 | { | |
59 | __sparc32_atomic_do_lock24 (&isem->lock); | |
60 | val = isem->value; | |
61 | if (val > 0) | |
62 | isem->value = val - 1; | |
63 | __sparc32_atomic_do_unlock24 (&isem->lock); | |
64 | } | |
65 | ||
66 | if (val > 0) | |
67 | return 0; | |
68 | ||
69 | if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) | |
70 | { | |
71 | __set_errno (EINVAL); | |
72 | return -1; | |
73 | } | |
74 | ||
75 | if (__atomic_is_v9) | |
76 | atomic_increment (&isem->nwaiters); | |
77 | else | |
78 | { | |
79 | __sparc32_atomic_do_lock24 (&isem->lock); | |
80 | isem->nwaiters++; | |
81 | __sparc32_atomic_do_unlock24 (&isem->lock); | |
82 | } | |
83 | ||
84 | pthread_cleanup_push (__sem_wait_cleanup, isem); | |
85 | ||
86 | while (1) | |
87 | { | |
88 | struct timeval tv; | |
89 | struct timespec rt; | |
90 | int sec, nsec; | |
91 | ||
92 | /* Get the current time. */ | |
93 | __gettimeofday (&tv, NULL); | |
94 | ||
95 | /* Compute relative timeout. */ | |
96 | sec = abstime->tv_sec - tv.tv_sec; | |
97 | nsec = abstime->tv_nsec - tv.tv_usec * 1000; | |
98 | if (nsec < 0) | |
99 | { | |
100 | nsec += 1000000000; | |
101 | --sec; | |
102 | } | |
103 | ||
104 | /* Already timed out? */ | |
105 | if (sec < 0) | |
106 | { | |
107 | __set_errno (ETIMEDOUT); | |
108 | err = -1; | |
109 | break; | |
110 | } | |
111 | ||
112 | /* Do wait. */ | |
113 | rt.tv_sec = sec; | |
114 | rt.tv_nsec = nsec; | |
115 | err = do_futex_timed_wait(isem, &rt); | |
116 | if (err != 0 && err != -EWOULDBLOCK) | |
117 | { | |
118 | __set_errno (-err); | |
119 | err = -1; | |
120 | break; | |
121 | } | |
122 | ||
123 | if (__atomic_is_v9) | |
124 | val = atomic_decrement_if_positive (&isem->value); | |
125 | else | |
126 | { | |
127 | __sparc32_atomic_do_lock24 (&isem->lock); | |
128 | val = isem->value; | |
129 | if (val > 0) | |
130 | isem->value = val - 1; | |
131 | __sparc32_atomic_do_unlock24 (&isem->lock); | |
132 | } | |
133 | ||
134 | if (val > 0) | |
135 | { | |
136 | err = 0; | |
137 | break; | |
138 | } | |
139 | } | |
140 | ||
141 | pthread_cleanup_pop (0); | |
142 | ||
143 | if (__atomic_is_v9) | |
144 | atomic_decrement (&isem->nwaiters); | |
145 | else | |
146 | { | |
147 | __sparc32_atomic_do_lock24 (&isem->lock); | |
148 | isem->nwaiters--; | |
149 | __sparc32_atomic_do_unlock24 (&isem->lock); | |
150 | } | |
151 | ||
152 | return err; | |
153 | } |