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| 1 | /* rwlock type. Generic version. |
|---|---|
| 2 | Copyright (C) 2002-2022 Free Software Foundation, Inc. |
| 3 | This file is part of the GNU C Library. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <https://www.gnu.org/licenses/>. */ |
| 18 | |
| 19 | #ifndef _BITS_TYPES_STRUCT___PTHREAD_RWLOCK_H |
| 20 | #define _BITS_TYPES_STRUCT___PTHREAD_RWLOCK_H |
| 21 | |
| 22 | #include <bits/types/__pthread_spinlock_t.h> |
| 23 | |
| 24 | /* User visible part of a rwlock. If __held is not held and readers |
| 25 | is 0, then the lock is unlocked. If __held is held and readers is |
| 26 | 0, then the lock is held by a writer. If __held is held and |
| 27 | readers is greater than 0, then the lock is held by READERS |
| 28 | readers. */ |
| 29 | struct __pthread_rwlock |
| 30 | { |
| 31 | __pthread_spinlock_t __held; |
| 32 | __pthread_spinlock_t __lock; |
| 33 | int __readers; |
| 34 | struct __pthread *__readerqueue; |
| 35 | struct __pthread *__writerqueue; |
| 36 | struct __pthread_rwlockattr *__attr; |
| 37 | void *__data; |
| 38 | }; |
| 39 | |
| 40 | /* Initializer for a rwlock. */ |
| 41 | #define __PTHREAD_RWLOCK_INITIALIZER \ |
| 42 | { __PTHREAD_SPIN_LOCK_INITIALIZER, __PTHREAD_SPIN_LOCK_INITIALIZER, 0, 0, 0, 0, 0 } |
| 43 | |
| 44 | |
| 45 | #endif /* bits/types/struct___pthread_rwlock.h */ |
| 46 |
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