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8ba6ad703c
900778283a ("htl: make pthread_spin_lock really spin") made
pthread_spin_lock really spin and not block, but the current users of
__pthread_spin_lock were assuming that it blocks, i.e. they use it as a
lightweight mutex fitting in just one int.
__pthread_spin_wait provides that support back.
97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/* Definitions of user-visible names for spin locks.
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Copyright (C) 1994-2020 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _BITS_SPIN_LOCK_INLINE_H
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#define _BITS_SPIN_LOCK_INLINE_H 1
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#include <features.h>
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#include <bits/types/__pthread_spinlock_t.h>
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#include <lock-intern.h> /* This does all the work. */
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__BEGIN_DECLS
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#if defined __USE_EXTERN_INLINES || defined _FORCE_INLINES
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# ifndef __EBUSY
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# include <errno.h>
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# define __EBUSY EBUSY
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# endif
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# ifndef __PT_SPIN_INLINE
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# define __PT_SPIN_INLINE __extern_inline
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# endif
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__PT_SPIN_INLINE int __pthread_spin_destroy (__pthread_spinlock_t *__lock);
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__PT_SPIN_INLINE int
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__pthread_spin_destroy (__pthread_spinlock_t *__lock)
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{
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return 0;
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}
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__PT_SPIN_INLINE int __pthread_spin_init (__pthread_spinlock_t *__lock,
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int __pshared);
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__PT_SPIN_INLINE int
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__pthread_spin_init (__pthread_spinlock_t *__lock, int __pshared)
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{
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*__lock = __PTHREAD_SPIN_LOCK_INITIALIZER;
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return 0;
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}
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__PT_SPIN_INLINE int __pthread_spin_trylock (__pthread_spinlock_t *__lock);
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__PT_SPIN_INLINE int
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__pthread_spin_trylock (__pthread_spinlock_t *__lock)
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{
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return __spin_try_lock ((__spin_lock_t *) __lock) ? 0 : __EBUSY;
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}
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__PT_SPIN_INLINE int __pthread_spin_lock (__pthread_spinlock_t *__lock);
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__PT_SPIN_INLINE int
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__pthread_spin_lock (__pthread_spinlock_t *__lock)
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{
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__spin_lock_solid ((__spin_lock_t *) __lock);
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return 0;
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}
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__PT_SPIN_INLINE int __pthread_spin_wait (__pthread_spinlock_t *__lock);
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__PT_SPIN_INLINE int
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__pthread_spin_wait (__pthread_spinlock_t *__lock)
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{
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__spin_lock ((__spin_lock_t *) __lock);
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return 0;
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}
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__PT_SPIN_INLINE int __pthread_spin_unlock (__pthread_spinlock_t *__lock);
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__PT_SPIN_INLINE int
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__pthread_spin_unlock (__pthread_spinlock_t *__lock)
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{
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__spin_unlock ((__spin_lock_t *) __lock);
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return 0;
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}
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#endif /* Use extern inlines or force inlines. */
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__END_DECLS
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#endif /* bits/types/__pthread_spinlock_t.h */
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