mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-31 22:10:34 +03:00
78 lines
2.0 KiB
C
78 lines
2.0 KiB
C
/* Machine-specific definition for spin locks. PowerPC version.
|
|
Copyright (C) 1994-2012 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, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#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)
|
|
{
|
|
long int __locked;
|
|
__asm__ __volatile__ ("\
|
|
0: lwarx %0,0,%1\n\
|
|
stwcx. %2,0,%1\n\
|
|
bne- 0b\n\
|
|
" : "=&r" (__locked) : "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\n\
|
|
stwcx. %2,0,%1\n\
|
|
bne- 0b\n\
|
|
" : "=&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\n\
|
|
stwcx. %0,0,%1\n\
|
|
bne- 0b\n\
|
|
" : "=&r" (__rtn) : "r" (__lock) : "cr0");
|
|
return __rtn;
|
|
}
|
|
|
|
|
|
#endif /* machine-lock.h */
|