projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| a945c346 | 1 | /* Copyright (C) 2015-2024 Free Software Foundation, Inc. |
| 6103184e | 2 | Contributed by Alexander Monakov <amonakov@ispras.ru> |
| 113020dc TS |
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 | ||
| 6103184e AM |
26 | /* This is an NVPTX specific implementation of a semaphore synchronization |
| 27 | mechanism for libgomp. This type is private to the library. This | |
| 28 | semaphore implementation uses atomic instructions and busy waiting. */ | |
| 29 | ||
| 30 | #ifndef GOMP_SEM_H | |
| 31 | #define GOMP_SEM_H 1 | |
| 32 | ||
| 33 | typedef int gomp_sem_t; | |
| 34 | ||
| 35 | static inline void | |
| 36 | gomp_sem_init (gomp_sem_t *sem, int value) | |
| 37 | { | |
| 38 | *sem = value; | |
| 39 | } | |
| 40 | ||
| 41 | static inline void | |
| 42 | gomp_sem_destroy (gomp_sem_t *sem) | |
| 43 | { | |
| 44 | } | |
| 113020dc | 45 | |
| 6103184e AM |
46 | static inline void |
| 47 | gomp_sem_wait (gomp_sem_t *sem) | |
| 48 | { | |
| 49 | int count = __atomic_load_n (sem, MEMMODEL_ACQUIRE); | |
| 50 | for (;;) | |
| 51 | { | |
| 52 | while (count == 0) | |
| 53 | count = __atomic_load_n (sem, MEMMODEL_ACQUIRE); | |
| 54 | if (__atomic_compare_exchange_n (sem, &count, count - 1, false, | |
| 55 | MEMMODEL_ACQUIRE, MEMMODEL_RELAXED)) | |
| 56 | return; | |
| 57 | } | |
| 58 | } | |
| 113020dc | 59 | |
| 6103184e AM |
60 | static inline void |
| 61 | gomp_sem_post (gomp_sem_t *sem) | |
| 62 | { | |
| 63 | (void) __atomic_add_fetch (sem, 1, MEMMODEL_RELEASE); | |
| 64 | } | |
| d3b41bde JJ |
65 | |
| 66 | static inline int | |
| 67 | gomp_sem_getcount (gomp_sem_t *sem) | |
| 68 | { | |
| 69 | int count = __atomic_load_n (sem, MEMMODEL_RELAXED); | |
| 70 | if (count < 0) | |
| 71 | return -1; | |
| 72 | return count; | |
| 73 | } | |
| 6103184e | 74 | #endif /* GOMP_SEM_H */ |