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9bdabb94 | 1 | /* sem_post -- post to a POSIX semaphore. Powerpc version. |
d4697bc9 | 2 | Copyright (C) 2003-2014 Free Software Foundation, Inc. |
b33e6163 | 3 | This file is part of the GNU C Library. |
9bdabb94 | 4 | Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003. |
b33e6163 RM |
5 | |
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
b33e6163 RM |
19 | |
20 | #include <errno.h> | |
21 | #include <sysdep.h> | |
22 | #include <lowlevellock.h> | |
23 | #include <internaltypes.h> | |
f006d3a0 | 24 | #include <semaphore.h> |
b33e6163 RM |
25 | |
26 | #include <shlib-compat.h> | |
27 | ||
b33e6163 RM |
28 | int |
29 | __new_sem_post (sem_t *sem) | |
e51deae7 UD |
30 | { |
31 | struct new_sem *isem = (struct new_sem *) sem; | |
32 | ||
33 | __asm __volatile (__lll_rel_instr ::: "memory"); | |
34 | atomic_increment (&isem->value); | |
35 | __asm __volatile (__lll_acq_instr ::: "memory"); | |
36 | if (isem->nwaiters > 0) | |
37 | { | |
38 | int err = lll_futex_wake (&isem->value, 1, | |
39 | isem->private ^ FUTEX_PRIVATE_FLAG); | |
40 | if (__builtin_expect (err, 0) < 0) | |
41 | { | |
42 | __set_errno (-err); | |
43 | return -1; | |
44 | } | |
45 | } | |
46 | return 0; | |
47 | } | |
48 | versioned_symbol (libpthread, __new_sem_post, sem_post, GLIBC_2_1); | |
49 | ||
50 | #if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1) | |
51 | ||
52 | int | |
53 | attribute_compat_text_section | |
54 | __old_sem_post (sem_t *sem) | |
b33e6163 | 55 | { |
4773086e | 56 | int *futex = (int *) sem; |
b33e6163 | 57 | |
9bdabb94 | 58 | __asm __volatile (__lll_rel_instr ::: "memory"); |
d39b9545 | 59 | (void) atomic_increment_val (futex); |
e51deae7 UD |
60 | /* We always have to assume it is a shared semaphore. */ |
61 | int err = lll_futex_wake (futex, 1, LLL_SHARED); | |
2c1d6172 | 62 | if (__builtin_expect (err, 0) < 0) |
b33e6163 | 63 | { |
2c1d6172 UD |
64 | __set_errno (-err); |
65 | return -1; | |
b33e6163 RM |
66 | } |
67 | return 0; | |
68 | } | |
e51deae7 | 69 | |
b33e6163 RM |
70 | compat_symbol (libpthread, __old_sem_post, sem_post, GLIBC_2_0); |
71 | #endif |