1 /* rwlock type. Generic version.
2 Copyright (C) 2002-2018 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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 <http://www.gnu.org/licenses/>. */
19 #ifndef _BITS_TYPES_STRUCT___PTHREAD_RWLOCK_H
20 #define _BITS_TYPES_STRUCT___PTHREAD_RWLOCK_H
22 #include <bits/types/__pthread_spinlock_t.h>
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
29 struct __pthread_rwlock
31 __pthread_spinlock_t __held
;
32 __pthread_spinlock_t __lock
;
34 struct __pthread
*__readerqueue
;
35 struct __pthread
*__writerqueue
;
36 struct __pthread_rwlockattr
*__attr
;
40 /* Initializer for a rwlock. */
41 #define __PTHREAD_RWLOCK_INITIALIZER \
42 { __PTHREAD_SPIN_LOCK_INITIALIZER, __PTHREAD_SPIN_LOCK_INITIALIZER, 0, 0, 0, 0, 0 }
45 #endif /* bits/types/struct___pthread_rwlock.h */