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