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33574c17 | 1 | /* pthread_barrier_wait. Generic version. |
04277e02 | 2 | Copyright (C) 2002-2019 Free Software Foundation, Inc. |
33574c17 ST |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
ad2b41bf ST |
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. | |
33574c17 ST |
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 | |
ad2b41bf | 13 | Lesser General Public License for more details. |
33574c17 | 14 | |
ad2b41bf ST |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
33574c17 ST |
18 | |
19 | #include <pthread.h> | |
20 | #include <assert.h> | |
21 | ||
22 | #include <pt-internal.h> | |
23 | ||
24 | int | |
25 | pthread_barrier_wait (pthread_barrier_t *barrier) | |
26 | { | |
27 | __pthread_spin_lock (&barrier->__lock); | |
28 | if (--barrier->__pending == 0) | |
29 | { | |
30 | barrier->__pending = barrier->__count; | |
31 | ||
32 | if (barrier->__count > 1) | |
33 | { | |
34 | struct __pthread *wakeup; | |
35 | unsigned n = 0; | |
36 | ||
37 | __pthread_queue_iterate (barrier->__queue, wakeup) | |
38 | n++; | |
39 | ||
40 | { | |
41 | struct __pthread *wakeups[n]; | |
42 | unsigned i = 0; | |
43 | ||
44 | __pthread_dequeuing_iterate (barrier->__queue, wakeup) | |
45 | wakeups[i++] = wakeup; | |
46 | ||
47 | barrier->__queue = NULL; | |
48 | __pthread_spin_unlock (&barrier->__lock); | |
49 | ||
50 | for (i = 0; i < n; i++) | |
51 | __pthread_wakeup (wakeups[i]); | |
52 | } | |
53 | } | |
54 | ||
55 | return PTHREAD_BARRIER_SERIAL_THREAD; | |
56 | } | |
57 | else | |
58 | { | |
59 | struct __pthread *self = _pthread_self (); | |
60 | ||
61 | /* Add ourselves to the list of waiters. */ | |
62 | __pthread_enqueue (&barrier->__queue, self); | |
63 | __pthread_spin_unlock (&barrier->__lock); | |
64 | ||
65 | __pthread_block (self); | |
66 | return 0; | |
67 | } | |
68 | } |