projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| a945c346 | 1 | /* Copyright (C) 2005-2024 Free Software Foundation, Inc. |
| 953ff289 DN |
2 | Contributed by Richard Henderson <rth@redhat.com>. |
| 3 | ||
| f1f3453e TS |
4 | This file is part of the GNU Offloading and Multi Processing Library |
| 5 | (libgomp). | |
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6 | |
| 7 | Libgomp is free software; you can redistribute it and/or modify it | |
| 748086b7 JJ |
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. | |
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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 | |
| 748086b7 | 14 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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15 | more details. |
| 16 | ||
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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/>. */ | |
| 953ff289 DN |
25 | |
| 26 | /* This is a Linux specific implementation of a mutex synchronization | |
| 27 | mechanism for libgomp. This type is private to the library. This | |
| 28 | implementation uses atomic instructions and the futex syscall. */ | |
| 29 | ||
| 30 | #ifndef GOMP_MUTEX_H | |
| 31 | #define GOMP_MUTEX_H 1 | |
| 32 | ||
| 33 | typedef int gomp_mutex_t; | |
| 34 | ||
| 35 | #define GOMP_MUTEX_INIT_0 1 | |
| 36 | ||
| b40c885f AM |
37 | extern void gomp_mutex_lock_slow (gomp_mutex_t *mutex, int); |
| 38 | extern void gomp_mutex_unlock_slow (gomp_mutex_t *mutex); | |
| 39 | ||
| 40 | static inline void | |
| 41 | gomp_mutex_init (gomp_mutex_t *mutex) | |
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42 | { |
| 43 | *mutex = 0; | |
| 44 | } | |
| 45 | ||
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46 | static inline void |
| 47 | gomp_mutex_destroy (gomp_mutex_t *mutex) | |
| 953ff289 | 48 | { |
| 953ff289 DN |
49 | } |
| 50 | ||
| b40c885f AM |
51 | static inline void |
| 52 | gomp_mutex_lock (gomp_mutex_t *mutex) | |
| 953ff289 | 53 | { |
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54 | int oldval = 0; |
| 55 | if (!__atomic_compare_exchange_n (mutex, &oldval, 1, false, | |
| 56 | MEMMODEL_ACQUIRE, MEMMODEL_RELAXED)) | |
| 57 | gomp_mutex_lock_slow (mutex, oldval); | |
| 953ff289 DN |
58 | } |
| 59 | ||
| b40c885f AM |
60 | static inline void |
| 61 | gomp_mutex_unlock (gomp_mutex_t *mutex) | |
| 953ff289 | 62 | { |
| b40c885f AM |
63 | int wait = __atomic_exchange_n (mutex, 0, MEMMODEL_RELEASE); |
| 64 | if (__builtin_expect (wait < 0, 0)) | |
| 65 | gomp_mutex_unlock_slow (mutex); | |
| 953ff289 | 66 | } |
| 953ff289 | 67 | #endif /* GOMP_MUTEX_H */ |