blob: 3b2226d897ab13b2853aef898a195d5c759c31f0 (
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
|
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2012 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
#include <aso.h>
int
asolock(unsigned int volatile* lock, unsigned int key, int type)
{
unsigned int k;
if (key)
switch (type)
{
case ASO_UNLOCK:
if (*lock != 0)
{
if (*lock != key)
return -1;
*lock = 0;
}
return 0;
case ASO_TRYLOCK:
if (*lock != key)
{
if (*lock != 0)
return -1;
*lock = key;
}
return 0;
case ASO_LOCK:
case ASO_SPINLOCK:
*lock = key;
return 0;
}
return -1;
}
|
