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1/* pthread_barrier_wait. Generic version.
2 Copyright (C) 2002-2019 Free Software Foundation, Inc.
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
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, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <pthread.h>
20#include <assert.h>
21
22#include <pt-internal.h>
23
24int
25pthread_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}
69

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