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