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1 | /* Copyright (C) 2005-2024 Free Software Foundation, Inc. | |
2 | Contributed by Richard Henderson <rth@redhat.com>. | |
3 | ||
4 | This file is part of the GNU Offloading and Multi Processing Library | |
5 | (libgomp). | |
6 | ||
7 | Libgomp is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3, or (at your option) | |
10 | any later version. | |
11 | ||
12 | Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
14 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
15 | more details. | |
16 | ||
17 | Under Section 7 of GPL version 3, you are granted additional | |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
25 | ||
26 | /* This is the default POSIX 1003.1b implementation of a semaphore | |
27 | synchronization mechanism for libgomp. This type is private to | |
28 | the library. | |
29 | ||
30 | This is a bit heavy weight for what we need, in that we're not | |
31 | interested in sem_wait as a cancelation point, but it's not too | |
32 | bad for a default. */ | |
33 | ||
34 | #ifndef GOMP_SEM_H | |
35 | #define GOMP_SEM_H 1 | |
36 | ||
37 | #ifdef HAVE_ATTRIBUTE_VISIBILITY | |
38 | # pragma GCC visibility push(default) | |
39 | #endif | |
40 | ||
41 | #include <semaphore.h> | |
42 | ||
43 | #ifdef HAVE_ATTRIBUTE_VISIBILITY | |
44 | # pragma GCC visibility pop | |
45 | #endif | |
46 | ||
47 | #ifdef HAVE_BROKEN_POSIX_SEMAPHORES | |
48 | #include <pthread.h> | |
49 | ||
50 | struct gomp_sem | |
51 | { | |
52 | pthread_mutex_t mutex; | |
53 | pthread_cond_t cond; | |
54 | int value; | |
55 | }; | |
56 | ||
57 | typedef struct gomp_sem gomp_sem_t; | |
58 | ||
59 | extern void gomp_sem_init (gomp_sem_t *sem, int value); | |
60 | ||
61 | extern void gomp_sem_wait (gomp_sem_t *sem); | |
62 | ||
63 | extern void gomp_sem_post (gomp_sem_t *sem); | |
64 | ||
65 | extern void gomp_sem_destroy (gomp_sem_t *sem); | |
66 | ||
67 | extern int gomp_sem_getcount (gomp_sem_t *sem); | |
68 | ||
69 | #else /* HAVE_BROKEN_POSIX_SEMAPHORES */ | |
70 | ||
71 | typedef sem_t gomp_sem_t; | |
72 | ||
73 | static inline void gomp_sem_init (gomp_sem_t *sem, int value) | |
74 | { | |
75 | sem_init (sem, 0, value); | |
76 | } | |
77 | ||
78 | extern void gomp_sem_wait (gomp_sem_t *sem); | |
79 | ||
80 | static inline void gomp_sem_post (gomp_sem_t *sem) | |
81 | { | |
82 | sem_post (sem); | |
83 | } | |
84 | ||
85 | static inline void gomp_sem_destroy (gomp_sem_t *sem) | |
86 | { | |
87 | sem_destroy (sem); | |
88 | } | |
89 | ||
90 | static inline int gomp_sem_getcount (gomp_sem_t *sem) | |
91 | { | |
92 | int val; | |
93 | if (sem_getvalue (sem, &val) < 0) | |
94 | return -1; | |
95 | return val; | |
96 | } | |
97 | #endif /* doesn't HAVE_BROKEN_POSIX_SEMAPHORES */ | |
98 | #endif /* GOMP_SEM_H */ |