projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 5624e564 | 1 | /* Copyright (C) 2005-2015 Free Software Foundation, Inc. |
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2 | Contributed by Richard Henderson <rth@redhat.com>. |
| 3 | ||
| 4 | This file is part of the GNU OpenMP Library (libgomp). | |
| 5 | ||
| 6 | Libgomp is free software; you can redistribute it and/or modify it | |
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7 | under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 3, or (at your option) | |
| 9 | any later version. | |
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10 | |
| 11 | Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
| 748086b7 | 13 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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14 | more details. |
| 15 | ||
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16 | Under Section 7 of GPL version 3, you are granted additional |
| 17 | permissions described in the GCC Runtime Library Exception, version | |
| 18 | 3.1, as published by the Free Software Foundation. | |
| 19 | ||
| 20 | You should have received a copy of the GNU General Public License and | |
| 21 | a copy of the GCC Runtime Library Exception along with this program; | |
| 22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
| 23 | <http://www.gnu.org/licenses/>. */ | |
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24 | |
| 25 | /* This is a Linux specific implementation of a mutex synchronization | |
| 26 | mechanism for libgomp. This type is private to the library. This | |
| 27 | implementation uses atomic instructions and the futex syscall. */ | |
| 28 | ||
| 29 | #ifndef GOMP_MUTEX_H | |
| 30 | #define GOMP_MUTEX_H 1 | |
| 31 | ||
| 32 | typedef int gomp_mutex_t; | |
| 33 | ||
| 34 | #define GOMP_MUTEX_INIT_0 1 | |
| 35 | ||
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36 | extern void gomp_mutex_lock_slow (gomp_mutex_t *mutex, int); |
| 37 | extern void gomp_mutex_unlock_slow (gomp_mutex_t *mutex); | |
| 38 | ||
| 39 | static inline void | |
| 40 | gomp_mutex_init (gomp_mutex_t *mutex) | |
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41 | { |
| 42 | *mutex = 0; | |
| 43 | } | |
| 44 | ||
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45 | static inline void |
| 46 | gomp_mutex_destroy (gomp_mutex_t *mutex) | |
| 953ff289 | 47 | { |
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48 | } |
| 49 | ||
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50 | static inline void |
| 51 | gomp_mutex_lock (gomp_mutex_t *mutex) | |
| 953ff289 | 52 | { |
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53 | int oldval = 0; |
| 54 | if (!__atomic_compare_exchange_n (mutex, &oldval, 1, false, | |
| 55 | MEMMODEL_ACQUIRE, MEMMODEL_RELAXED)) | |
| 56 | gomp_mutex_lock_slow (mutex, oldval); | |
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57 | } |
| 58 | ||
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59 | static inline void |
| 60 | gomp_mutex_unlock (gomp_mutex_t *mutex) | |
| 953ff289 | 61 | { |
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62 | int wait = __atomic_exchange_n (mutex, 0, MEMMODEL_RELEASE); |
| 63 | if (__builtin_expect (wait < 0, 0)) | |
| 64 | gomp_mutex_unlock_slow (mutex); | |
| 953ff289 | 65 | } |
| 953ff289 | 66 | #endif /* GOMP_MUTEX_H */ |