1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2012 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                 Eclipse Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*          http://www.eclipse.org/org/documents/epl-v10.html           *
11*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
12*                                                                      *
13*              Information and Software Systems Research               *
14*                            AT&T Research                             *
15*                           Florham Park NJ                            *
16*                                                                      *
17*                 Glenn Fowler <gsf@research.att.com>                  *
18*                  David Korn <dgk@research.att.com>                   *
19*                   Phong Vo <kpv@research.att.com>                    *
20*                                                                      *
21***********************************************************************/
22#pragma prototyped
23
24#include <aso.h>
25
26int
27asolock(unsigned int volatile* lock, unsigned int key, int type)
28{
29	unsigned int	k;
30
31	if (key)
32		switch (type)
33		{
34		case ASO_UNLOCK:
35			if (*lock != 0)
36			{
37				if (*lock != key)
38					return -1;
39				*lock = 0;
40			}
41			return 0;
42		case ASO_TRYLOCK:
43			if (*lock != key)
44			{
45				if (*lock != 0)
46					return -1;
47				*lock = key;
48			}
49			return 0;
50		case ASO_LOCK:
51		case ASO_SPINLOCK:
52			*lock = key;
53			return 0;
54		}
55	return -1;
56}
57