| 1 | /* pthread_barrier_wait. Generic version. |
|---|---|
| 2 | Copyright (C) 2002-2024 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 | <https://www.gnu.org/licenses/>. */ |
| 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_wait (&barrier->__lock); |
| 28 | if (--barrier->__pending == 0) |
| 29 | { |
| 30 | barrier->__pending = barrier->__count; |
| 31 | |
| 32 | if (barrier->__count == 1) |
| 33 | __pthread_spin_unlock (&barrier->__lock); |
| 34 | else |
| 35 | { |
| 36 | struct __pthread *wakeup; |
| 37 | unsigned n = 0; |
| 38 | |
| 39 | __pthread_queue_iterate (barrier->__queue, wakeup) |
| 40 | n++; |
| 41 | |
| 42 | { |
| 43 | struct __pthread *wakeups[n]; |
| 44 | unsigned i = 0; |
| 45 | |
| 46 | __pthread_dequeuing_iterate (barrier->__queue, wakeup) |
| 47 | wakeups[i++] = wakeup; |
| 48 | |
| 49 | barrier->__queue = NULL; |
| 50 | __pthread_spin_unlock (&barrier->__lock); |
| 51 | |
| 52 | for (i = 0; i < n; i++) |
| 53 | __pthread_wakeup (wakeups[i]); |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | return PTHREAD_BARRIER_SERIAL_THREAD; |
| 58 | } |
| 59 | else |
| 60 | { |
| 61 | struct __pthread *self = _pthread_self (); |
| 62 | |
| 63 | /* Add ourselves to the list of waiters. */ |
| 64 | __pthread_enqueue (&barrier->__queue, self); |
| 65 | __pthread_spin_unlock (&barrier->__lock); |
| 66 | |
| 67 | __pthread_block (self); |
| 68 | return 0; |
| 69 | } |
| 70 | } |
| 71 |