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11bf311e | 1 | /* Copyright (C) 2006 Free Software Foundation, Inc. |
f1740bc4 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Jakub Jelinek <jakub@redhat.com>, 2006. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <sysdep.h> | |
22 | #include <lowlevellock.h> | |
23 | #include <sys/time.h> | |
24 | #include <pthreadP.h> | |
25 | ||
26 | ||
27 | int | |
28 | __lll_robust_lock_wait (int *futex) | |
29 | { | |
30 | int oldval = *futex; | |
31 | int tid = THREAD_GETMEM (THREAD_SELF, tid); | |
32 | ||
33 | do | |
34 | { | |
35 | if (__builtin_expect (oldval & FUTEX_OWNER_DIED, 0)) | |
36 | return oldval; | |
37 | ||
38 | int newval = oldval | FUTEX_WAITERS; | |
39 | if (oldval != newval | |
40 | && atomic_compare_and_exchange_bool_acq (futex, newval, oldval)) | |
41 | continue; | |
42 | ||
43 | lll_futex_wait (futex, newval); | |
44 | } | |
42b6ddfc UD |
45 | while ((oldval = atomic_compare_and_exchange_val_acq (futex, |
46 | tid | FUTEX_WAITERS, | |
47 | 0)) != 0); | |
f1740bc4 UD |
48 | return 0; |
49 | } | |
50 | ||
51 | ||
52 | int | |
53 | __lll_robust_timedlock_wait (int *futex, const struct timespec *abstime) | |
54 | { | |
55 | /* Reject invalid timeouts. */ | |
56 | if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000) | |
57 | return EINVAL; | |
58 | ||
59 | int tid = THREAD_GETMEM (THREAD_SELF, tid); | |
60 | ||
61 | do | |
62 | { | |
63 | struct timeval tv; | |
64 | struct timespec rt; | |
65 | ||
66 | /* Get the current time. */ | |
67 | (void) __gettimeofday (&tv, NULL); | |
68 | ||
69 | /* Compute relative timeout. */ | |
70 | rt.tv_sec = abstime->tv_sec - tv.tv_sec; | |
71 | rt.tv_nsec = abstime->tv_nsec - tv.tv_usec * 1000; | |
72 | if (rt.tv_nsec < 0) | |
73 | { | |
74 | rt.tv_nsec += 1000000000; | |
75 | --rt.tv_sec; | |
76 | } | |
77 | ||
78 | /* Already timed out? */ | |
79 | if (rt.tv_sec < 0) | |
80 | return ETIMEDOUT; | |
81 | ||
82 | /* Wait. */ | |
11bf311e | 83 | int oldval = *futex; |
f1740bc4 UD |
84 | if (__builtin_expect (oldval & FUTEX_OWNER_DIED, 0)) |
85 | return oldval; | |
86 | ||
87 | int newval = oldval | FUTEX_WAITERS; | |
88 | if (oldval != newval | |
89 | && atomic_compare_and_exchange_bool_acq (futex, newval, oldval)) | |
90 | continue; | |
91 | ||
92 | lll_futex_timed_wait (futex, newval, &rt); | |
93 | } | |
11bf311e | 94 | while (atomic_compare_and_exchange_bool_acq (futex, tid | FUTEX_WAITERS, 0)); |
f1740bc4 UD |
95 | |
96 | return 0; | |
97 | } |