| 1 | /* Copyright (C) 2008, 2009 Free Software Foundation, Inc. |
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| 2 | Contributed by Jakub Jelinek <jakub@redhat.com>. |
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| 3 | |
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| 4 | This file is part of the GNU OpenMP Library (libgomp). |
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| 5 | |
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| 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 |
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| 8 | the Free Software Foundation; either version 3, or (at your option) |
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| 9 | any later version. |
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| 10 | |
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| 11 | Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY |
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| 12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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| 13 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
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| 14 | more details. |
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| 15 | |
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| 16 | Under Section 7 of GPL version 3, you are granted additional |
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| 17 | permissions described in the GCC Runtime Library Exception, version |
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| 18 | 3.1, as published by the Free Software Foundation. |
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| 19 | |
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| 20 | You should have received a copy of the GNU General Public License and |
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| 21 | a copy of the GCC Runtime Library Exception along with this program; |
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| 22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
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| 23 | <http://www.gnu.org/licenses/>. */ |
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| 24 | |
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| 25 | /* This is a Linux specific implementation of a mutex synchronization |
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| 26 | mechanism for libgomp. This type is private to the library. This |
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| 27 | implementation uses atomic instructions and the futex syscall. */ |
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| 28 | |
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| 29 | #ifndef GOMP_PTRLOCK_H |
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| 30 | #define GOMP_PTRLOCK_H 1 |
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| 31 | |
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| 32 | typedef struct { void *ptr; gomp_mutex_t lock; } gomp_ptrlock_t; |
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| 33 | |
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| 34 | static inline void gomp_ptrlock_init (gomp_ptrlock_t *ptrlock, void *ptr) |
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| 35 | { |
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| 36 | ptrlock->ptr = ptr; |
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| 37 | gomp_mutex_init (&ptrlock->lock); |
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| 38 | } |
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| 39 | |
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| 40 | static inline void *gomp_ptrlock_get (gomp_ptrlock_t *ptrlock) |
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| 41 | { |
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| 42 | if (ptrlock->ptr != NULL) |
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| 43 | return ptrlock->ptr; |
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| 44 | |
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| 45 | gomp_mutex_lock (&ptrlock->lock); |
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| 46 | if (ptrlock->ptr != NULL) |
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| 47 | { |
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| 48 | gomp_mutex_unlock (&ptrlock->lock); |
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| 49 | return ptrlock->ptr; |
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| 50 | } |
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| 51 | |
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| 52 | return NULL; |
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| 53 | } |
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| 54 | |
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| 55 | static inline void gomp_ptrlock_set (gomp_ptrlock_t *ptrlock, void *ptr) |
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| 56 | { |
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| 57 | ptrlock->ptr = ptr; |
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| 58 | gomp_mutex_unlock (&ptrlock->lock); |
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| 59 | } |
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| 60 | |
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| 61 | static inline void gomp_ptrlock_destroy (gomp_ptrlock_t *ptrlock) |
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| 62 | { |
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| 63 | gomp_mutex_destroy (&ptrlock->lock); |
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| 64 | } |
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| 65 | |
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| 66 | #endif /* GOMP_PTRLOCK_H */ |
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