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/* Definitions of user-visible names for spin locks.
Copyright (C) 1994, 1997, 2002 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _BITS_SPIN_LOCK_H
#define _BITS_SPIN_LOCK_H 1
#include <features.h>
#include <machine-lock.h> /* This does all the work. */
__BEGIN_DECLS
/* The type of a spin lock object. */
typedef __spin_lock_t __pthread_spinlock_t;
/* Initializer for a spin lock object. */
#ifndef __SPIN_LOCK_INITIALIZER
#error __SPIN_LOCK_INITIALIZER undefined: should be defined by <lock-intern.h>.
#endif
#if defined __USE_EXTERN_INLINES || defined _FORCE_INLINES
# ifndef __EBUSY
# include <errno.h>
# define __EBUSY EBUSY
# endif
# ifndef __PT_SPIN_INLINE
# define __PT_SPIN_INLINE extern __inline
# endif
__PT_SPIN_INLINE int __pthread_spin_destroy (__pthread_spinlock_t *__lock);
__PT_SPIN_INLINE int
__pthread_spin_destroy (__pthread_spinlock_t *__lock)
{
return 0;
}
__PT_SPIN_INLINE int __pthread_spin_init (__pthread_spinlock_t *__lock,
int __pshared);
__PT_SPIN_INLINE int
__pthread_spin_init (__pthread_spinlock_t *__lock, int __pshared)
{
*__lock = __SPIN_LOCK_INITIALIZER;
return 0;
}
__PT_SPIN_INLINE int __pthread_spin_trylock (__pthread_spinlock_t *__lock);
__PT_SPIN_INLINE int
__pthread_spin_trylock (__pthread_spinlock_t *__lock)
{
return __spin_try_lock (__lock) ? 0 : __EBUSY;
}
extern inline int __pthread_spin_lock (__pthread_spinlock_t *__lock);
extern int _pthread_spin_lock (__pthread_spinlock_t *__lock);
extern inline int
__pthread_spin_lock (__pthread_spinlock_t *__lock)
{
if (__pthread_spin_trylock (__lock))
return _pthread_spin_lock (__lock);
return 0;
}
__PT_SPIN_INLINE int __pthread_spin_unlock (__pthread_spinlock_t *__lock);
__PT_SPIN_INLINE int
__pthread_spin_unlock (__pthread_spinlock_t *__lock)
{
__spin_unlock (__lock);
return 0;
}
#endif /* Use extern inlines or force inlines. */
__END_DECLS
#endif /* bits/spin-lock.h */
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