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835abc5c | 1 | /* Copyright (C) 2003, 2004, 2006, 2007 Free Software Foundation, Inc. |
a88c9263 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/>. */ | |
a88c9263 UD |
18 | |
19 | #include <endian.h> | |
20 | #include <errno.h> | |
21 | #include <sysdep.h> | |
22 | #include <lowlevellock.h> | |
23 | #include <pthread.h> | |
24 | #include <pthreadP.h> | |
25 | ||
26 | #include <shlib-compat.h> | |
69431c9a | 27 | #include <kernel-features.h> |
a88c9263 UD |
28 | |
29 | ||
30 | int | |
31 | __pthread_cond_broadcast (cond) | |
32 | pthread_cond_t *cond; | |
33 | { | |
5bd8a249 UD |
34 | int pshared = (cond->__data.__mutex == (void *) ~0l) |
35 | ? LLL_SHARED : LLL_PRIVATE; | |
a88c9263 | 36 | /* Make sure we are alone. */ |
5bd8a249 | 37 | lll_lock (cond->__data.__lock, pshared); |
a88c9263 UD |
38 | |
39 | /* Are there any waiters to be woken? */ | |
40 | if (cond->__data.__total_seq > cond->__data.__wakeup_seq) | |
41 | { | |
42 | /* Yes. Mark them all as woken. */ | |
43 | cond->__data.__wakeup_seq = cond->__data.__total_seq; | |
893a3511 | 44 | cond->__data.__woken_seq = cond->__data.__total_seq; |
75fccede UD |
45 | cond->__data.__futex = (unsigned int) cond->__data.__total_seq * 2; |
46 | int futex_val = cond->__data.__futex; | |
893a3511 UD |
47 | /* Signal that a broadcast happened. */ |
48 | ++cond->__data.__broadcast_seq; | |
a88c9263 | 49 | |
bbb9ba43 | 50 | /* We are done. */ |
5bd8a249 | 51 | lll_unlock (cond->__data.__lock, pshared); |
bbb9ba43 | 52 | |
e42a990e UD |
53 | /* Do not use requeue for pshared condvars. */ |
54 | if (cond->__data.__mutex == (void *) ~0l) | |
55 | goto wake_all; | |
56 | ||
a88c9263 | 57 | /* Wake everybody. */ |
69431c9a | 58 | pthread_mutex_t *mut = (pthread_mutex_t *) cond->__data.__mutex; |
df47504c UD |
59 | |
60 | /* XXX: Kernel so far doesn't support requeue to PI futex. */ | |
5bd8a249 UD |
61 | /* XXX: Kernel so far can only requeue to the same type of futex, |
62 | in this case private (we don't requeue for pshared condvars). */ | |
63 | if (__builtin_expect (mut->__data.__kind | |
64 | & (PTHREAD_MUTEX_PRIO_INHERIT_NP | |
65 | | PTHREAD_MUTEX_PSHARED_BIT), 0)) | |
df47504c UD |
66 | goto wake_all; |
67 | ||
75fccede UD |
68 | /* lll_futex_requeue returns 0 for success and non-zero |
69 | for errors. */ | |
70 | if (__builtin_expect (lll_futex_requeue (&cond->__data.__futex, 1, | |
71 | INT_MAX, &mut->__data.__lock, | |
5bd8a249 | 72 | futex_val, LLL_PRIVATE), 0)) |
69431c9a UD |
73 | { |
74 | /* The requeue functionality is not available. */ | |
e42a990e | 75 | wake_all: |
5bd8a249 | 76 | lll_futex_wake (&cond->__data.__futex, INT_MAX, pshared); |
69431c9a | 77 | } |
bbb9ba43 UD |
78 | |
79 | /* That's all. */ | |
80 | return 0; | |
a88c9263 UD |
81 | } |
82 | ||
83 | /* We are done. */ | |
5bd8a249 | 84 | lll_unlock (cond->__data.__lock, pshared); |
a88c9263 UD |
85 | |
86 | return 0; | |
87 | } | |
88 | ||
89 | versioned_symbol (libpthread, __pthread_cond_broadcast, pthread_cond_broadcast, | |
90 | GLIBC_2_3_2); |