mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-23 11:20:07 +00:00
76 lines
2.0 KiB
C
76 lines
2.0 KiB
C
|
/* Machine-specific definition for spin locks. PowerPC version.
|
||
|
|
Copyright (C) 1994, 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 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. */
|
||
|
|
|
||
|
|
#ifndef _MACHINE_LOCK_H
|
||
|
|
#define _MACHINE_LOCK_H
|
||
|
|
|
||
|
|
/* The type of a spin lock variable. */
|
||
|
|
|
||
|
|
typedef __volatile long int __spin_lock_t;
|
||
|
|
|
||
|
|
/* Value to initialize `__spin_lock_t' variables to. */
|
||
|
|
|
||
|
|
#define __SPIN_LOCK_INITIALIZER 0L
|
||
|
|
|
||
|
|
|
||
|
|
#ifndef _EXTERN_INLINE
|
||
|
|
#define _EXTERN_INLINE extern __inline
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/* Unlock LOCK. */
|
||
|
|
|
||
|
|
_EXTERN_INLINE void
|
||
|
|
__spin_unlock (__spin_lock_t *__lock)
|
||
|
|
{
|
||
|
|
__asm__ __volatile__ ("sync ; stwcx. %1,0,%0"
|
||
|
|
: : "r" (__lock), "r" (0) : "cr0");
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Try to lock LOCK; return nonzero if we locked it, zero if another has. */
|
||
|
|
|
||
|
|
_EXTERN_INLINE int
|
||
|
|
__spin_try_lock (register __spin_lock_t *__lock)
|
||
|
|
{
|
||
|
|
long int __rtn;
|
||
|
|
|
||
|
|
__asm__ __volatile__ ("\
|
||
|
|
0: lwarx %0,0,%1
|
||
|
|
stwcx. %2,0,%1
|
||
|
|
bne- 0b
|
||
|
|
" : "=&r"(__rtn) : "r"(__lock), "r"(1) : "cr0");
|
||
|
|
return ~__rtn;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Return nonzero if LOCK is locked. */
|
||
|
|
|
||
|
|
_EXTERN_INLINE int
|
||
|
|
__spin_lock_locked (__spin_lock_t *__lock)
|
||
|
|
{
|
||
|
|
long int __rtn;
|
||
|
|
__asm__ __volatile__ ("\
|
||
|
|
0: lwarx %0,0,%1
|
||
|
|
stwcx. %0,0,%1
|
||
|
|
bne- 0b
|
||
|
|
" : "=&r"(__rtn) : "r"(__lock) : "cr0");
|
||
|
|
return __rtn;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#endif /* machine-lock.h */
|