46 lines
1.7 KiB
C
46 lines
1.7 KiB
C
/* rwlock type. Generic version.
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Copyright (C) 2002-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <http://www.gnu.org/licenses/>. */
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#ifndef _BITS_TYPES_STRUCT___PTHREAD_RWLOCK_H
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#define _BITS_TYPES_STRUCT___PTHREAD_RWLOCK_H
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#include <bits/types/__pthread_spinlock_t.h>
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/* User visible part of a rwlock. If __held is not held and readers
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is 0, then the lock is unlocked. If __held is held and readers is
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0, then the lock is held by a writer. If __held is held and
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readers is greater than 0, then the lock is held by READERS
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readers. */
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struct __pthread_rwlock
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{
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__pthread_spinlock_t __held;
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__pthread_spinlock_t __lock;
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int __readers;
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struct __pthread *__readerqueue;
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struct __pthread *__writerqueue;
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struct __pthread_rwlockattr *__attr;
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void *__data;
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};
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/* Initializer for a rwlock. */
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#define __PTHREAD_RWLOCK_INITIALIZER \
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{ __PTHREAD_SPIN_LOCK_INITIALIZER, __PTHREAD_SPIN_LOCK_INITIALIZER, 0, 0, 0, 0, 0 }
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#endif /* bits/types/struct___pthread_rwlock.h */
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