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568035b7 | 1 | /* Copyright (C) 2003-2013 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> |
5acf7263 | 28 | #include <stap-probe.h> |
69431c9a | 29 | |
a88c9263 UD |
30 | |
31 | int | |
32 | __pthread_cond_signal (cond) | |
33 | pthread_cond_t *cond; | |
34 | { | |
5bd8a249 UD |
35 | int pshared = (cond->__data.__mutex == (void *) ~0l) |
36 | ? LLL_SHARED : LLL_PRIVATE; | |
37 | ||
5acf7263 RM |
38 | LIBC_PROBE (cond_signal, 1, cond); |
39 | ||
a88c9263 | 40 | /* Make sure we are alone. */ |
5bd8a249 | 41 | lll_lock (cond->__data.__lock, pshared); |
a88c9263 UD |
42 | |
43 | /* Are there any waiters to be woken? */ | |
44 | if (cond->__data.__total_seq > cond->__data.__wakeup_seq) | |
45 | { | |
46 | /* Yes. Mark one of them as woken. */ | |
47 | ++cond->__data.__wakeup_seq; | |
75fccede | 48 | ++cond->__data.__futex; |
a88c9263 UD |
49 | |
50 | /* Wake one. */ | |
a3615024 | 51 | if (! __builtin_expect (lll_futex_wake_unlock (&cond->__data.__futex, 1, |
835abc5c | 52 | 1, &cond->__data.__lock, |
5bd8a249 | 53 | pshared), 0)) |
a3615024 UD |
54 | return 0; |
55 | ||
5bd8a249 | 56 | lll_futex_wake (&cond->__data.__futex, 1, pshared); |
a88c9263 UD |
57 | } |
58 | ||
59 | /* We are done. */ | |
5bd8a249 | 60 | lll_unlock (cond->__data.__lock, pshared); |
a88c9263 UD |
61 | |
62 | return 0; | |
63 | } | |
64 | ||
65 | versioned_symbol (libpthread, __pthread_cond_signal, pthread_cond_signal, | |
66 | GLIBC_2_3_2); |