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d4697bc9 | 1 | /* Copyright (C) 2002-2014 Free Software Foundation, Inc. |
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2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. | |
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/>. */ | |
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18 | |
19 | #include <errno.h> | |
20 | #include "pthreadP.h" | |
21 | #include <lowlevellock.h> | |
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22 | #include <kernel-features.h> |
23 | ||
24 | ||
69854bb5 | 25 | static const struct pthread_barrierattr default_barrierattr = |
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26 | { |
27 | .pshared = PTHREAD_PROCESS_PRIVATE | |
28 | }; | |
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29 | |
30 | ||
31 | int | |
32 | pthread_barrier_init (barrier, attr, count) | |
33 | pthread_barrier_t *barrier; | |
34 | const pthread_barrierattr_t *attr; | |
35 | unsigned int count; | |
36 | { | |
37 | struct pthread_barrier *ibarrier; | |
38 | ||
39 | if (__builtin_expect (count == 0, 0)) | |
40 | return EINVAL; | |
41 | ||
e51deae7 | 42 | const struct pthread_barrierattr *iattr |
d8ff3792 UD |
43 | = (attr != NULL |
44 | ? iattr = (struct pthread_barrierattr *) attr | |
69854bb5 | 45 | : &default_barrierattr); |
76a50749 | 46 | |
d8ff3792 UD |
47 | if (iattr->pshared != PTHREAD_PROCESS_PRIVATE |
48 | && __builtin_expect (iattr->pshared != PTHREAD_PROCESS_SHARED, 0)) | |
49 | /* Invalid attribute. */ | |
50 | return EINVAL; | |
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51 | |
52 | ibarrier = (struct pthread_barrier *) barrier; | |
53 | ||
54 | /* Initialize the individual fields. */ | |
55 | ibarrier->lock = LLL_LOCK_INITIALIZER; | |
56 | ibarrier->left = count; | |
57 | ibarrier->init_count = count; | |
58 | ibarrier->curr_event = 0; | |
59 | ||
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60 | #ifdef __ASSUME_PRIVATE_FUTEX |
61 | ibarrier->private = (iattr->pshared != PTHREAD_PROCESS_PRIVATE | |
62 | ? 0 : FUTEX_PRIVATE_FLAG); | |
63 | #else | |
64 | ibarrier->private = (iattr->pshared != PTHREAD_PROCESS_PRIVATE | |
65 | ? 0 : THREAD_GETMEM (THREAD_SELF, | |
66 | header.private_futex)); | |
67 | #endif | |
68 | ||
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69 | return 0; |
70 | } |