aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/mach/powerpc/machine-lock.h
blob: 84159c5a5dfa4014a7b762a1e4d667b526a6a51f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
/* 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 */