[thirdparty/glibc.git] / sysdeps / mach / hppa / machine-lock.h

/* Machine-specific definition for spin locks.  HPPA version.
   Copyright (C) 1995, 1997 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 _MACHINE_LOCK_H
#define	_MACHINE_LOCK_H

/* The type of a spin lock variable.  */

typedef __volatile int __spin_lock_t __attribute__ ((__aligned__ (16)));

/* Value to initialize `__spin_lock_t' variables to.  */

#define	__SPIN_LOCK_INITIALIZER	-1


#ifndef _EXTERN_INLINE
#define _EXTERN_INLINE extern __inline
#endif

/* Unlock LOCK.  */

_EXTERN_INLINE void
__spin_unlock (__spin_lock_t *__lock)
{
  *__lock = -1;
}

/* Try to lock LOCK; return nonzero if we locked it, zero if another has.  */

_EXTERN_INLINE int
__spin_try_lock (__spin_lock_t *__lock)
{
  register int __result;
  __asm__ __volatile__ ("ldcws %0, %1" : "=m" (*__lock), "=r" (__result));
  return __result != 0;
}

/* Return nonzero if LOCK is locked.  */

_EXTERN_INLINE int
__spin_lock_locked (__spin_lock_t *__lock)
{
  return *__lock == 0;
}


#endif /* machine-lock.h */
Commit	Line	Data
28f540f4	1	/* Machine-specific definition for spin locks. HPPA version.
478b92f0 UD	2	Copyright (C) 1995, 1997 Free Software Foundation, Inc.
	3	This file is part of the GNU C Library.
	4
	5	The GNU C Library is free software; you can redistribute it and/or
41bdb6e2 AJ	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.
478b92f0 UD	9
	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
41bdb6e2	13	Lesser General Public License for more details.
478b92f0	14
41bdb6e2 AJ	15	You should have received a copy of the GNU Lesser General Public
	16	License along with the GNU C Library; if not, write to the Free
	17	Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	18	02111-1307 USA. */
28f540f4 RM	19
	20	#ifndef _MACHINE_LOCK_H
	21	#define _MACHINE_LOCK_H
	22
	23	/* The type of a spin lock variable. */
	24
	25	typedef __volatile int __spin_lock_t __attribute__ ((__aligned__ (16)));
	26
	27	/* Value to initialize `__spin_lock_t' variables to. */
	28
	29	#define __SPIN_LOCK_INITIALIZER -1
	30
	31
	32	#ifndef _EXTERN_INLINE
	33	#define _EXTERN_INLINE extern __inline
	34	#endif
	35
	36	/* Unlock LOCK. */
	37
	38	_EXTERN_INLINE void
	39	__spin_unlock (__spin_lock_t *__lock)
	40	{
	41	*__lock = -1;
	42	}
	43
	44	/* Try to lock LOCK; return nonzero if we locked it, zero if another has. */
	45
	46	_EXTERN_INLINE int
	47	__spin_try_lock (__spin_lock_t *__lock)
	48	{
	49	register int __result;
	50	__asm__ __volatile__ ("ldcws %0, %1" : "=m" (*__lock), "=r" (__result));
	51	return __result != 0;
	52	}
	53
	54	/* Return nonzero if LOCK is locked. */
	55
	56	_EXTERN_INLINE int
	57	__spin_lock_locked (__spin_lock_t *__lock)
	58	{
	59	return *__lock == 0;
	60	}
	61
	62
	63	#endif /* machine-lock.h */