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/* Machine-specific definitions for spin locks. i386 version.
Copyright (C) 2000, 2005, 2008 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/*
* Never include this file directly; use <pthread.h> or <cthreads.h> instead.
*/
#ifndef _BITS_SPIN_LOCK_H
#define _BITS_SPIN_LOCK_H 1
#include <features.h>
__BEGIN_DECLS
/* The type of a spin lock object. */
typedef __volatile int __pthread_spinlock_t;
/* Initializer for a spin lock object. */
# define __SPIN_LOCK_INITIALIZER (0)
#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)
{
int __locked;
__asm__ __volatile ("xchgl %0, %1"
: "=&r" (__locked), "=m" (*__lock) : "0" (1));
return __locked ? __EBUSY : 0;
}
__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)
{
int __unlocked;
__asm__ __volatile ("xchgl %0, %1"
: "=&r" (__unlocked), "=m" (*__lock) : "0" (0));
return 0;
}
#endif /* Use extern inlines or force inlines. */
__END_DECLS
#endif /* bits/spin-lock.h */
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