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f7a9f785 | 1 | /* Copyright (C) 2003-2016 Free Software Foundation, Inc. |
e51deae7 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003. | |
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 | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
e51deae7 UD |
18 | |
19 | #include <errno.h> | |
20 | #include <sysdep.h> | |
21 | #include <lowlevellock.h> | |
22 | #include <pthreadP.h> | |
7000d82e | 23 | #include <sparc-nptl.h> |
a2f0363f | 24 | #include <futex-internal.h> |
e51deae7 UD |
25 | |
26 | /* Wait on barrier. */ | |
27 | int | |
bd2260a2 | 28 | __pthread_barrier_wait (pthread_barrier_t *barrier) |
e51deae7 UD |
29 | { |
30 | union sparc_pthread_barrier *ibarrier | |
31 | = (union sparc_pthread_barrier *) barrier; | |
32 | int result = 0; | |
33 | int private = ibarrier->s.pshared ? LLL_SHARED : LLL_PRIVATE; | |
a2f0363f | 34 | int futex_private = ibarrier->s.pshared ? FUTEX_SHARED : FUTEX_PRIVATE; |
e51deae7 UD |
35 | |
36 | /* Make sure we are alone. */ | |
37 | lll_lock (ibarrier->b.lock, private); | |
38 | ||
39 | /* One more arrival. */ | |
40 | --ibarrier->b.left; | |
41 | ||
42 | /* Are these all? */ | |
43 | if (ibarrier->b.left == 0) | |
44 | { | |
45 | /* Yes. Increment the event counter to avoid invalid wake-ups and | |
46 | tell the current waiters that it is their turn. */ | |
47 | ++ibarrier->b.curr_event; | |
48 | ||
49 | /* Wake up everybody. */ | |
a2f0363f | 50 | futex_wake (&ibarrier->b.curr_event, INT_MAX, futex_private); |
e51deae7 UD |
51 | |
52 | /* This is the thread which finished the serialization. */ | |
53 | result = PTHREAD_BARRIER_SERIAL_THREAD; | |
54 | } | |
55 | else | |
56 | { | |
57 | /* The number of the event we are waiting for. The barrier's event | |
58 | number must be bumped before we continue. */ | |
59 | unsigned int event = ibarrier->b.curr_event; | |
60 | ||
61 | /* Before suspending, make the barrier available to others. */ | |
62 | lll_unlock (ibarrier->b.lock, private); | |
63 | ||
64 | /* Wait for the event counter of the barrier to change. */ | |
65 | do | |
a2f0363f | 66 | futex_wait_simple (&ibarrier->b.curr_event, event, futex_private); |
e51deae7 UD |
67 | while (event == ibarrier->b.curr_event); |
68 | } | |
69 | ||
70 | /* Make sure the init_count is stored locally or in a register. */ | |
71 | unsigned int init_count = ibarrier->b.init_count; | |
72 | ||
73 | /* If this was the last woken thread, unlock. */ | |
74 | if (atomic_increment_val (&ibarrier->b.left) == init_count) | |
75 | /* We are done. */ | |
76 | lll_unlock (ibarrier->b.lock, private); | |
77 | ||
78 | return result; | |
79 | } | |
90dd5913 | 80 | weak_alias (__pthread_barrier_wait, pthread_barrier_wait) |