1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2011 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 "asohdr.h" 25 26 #if defined(_UWIN) && defined(_BLD_ast) 27 28 NoN(asolock) 29 30 #else 31 32 int 33 asolock(unsigned int volatile* lock, unsigned int key, int type) 34 { 35 unsigned int k; 36 37 if (key) 38 switch (type) 39 { 40 case ASO_UNLOCK: 41 return *lock == 0 ? 0 : asocasint(lock, key, 0) == key ? 0 : -1; 42 case ASO_TRYLOCK: 43 return *lock == key ? 0 : asocasint(lock, 0, key) == 0 ? 0 : -1; 44 case ASO_LOCK: 45 if (*lock == key) 46 return 0; 47 /*FALLTHROUGH*/ 48 case ASO_SPINLOCK: 49 for (k = 0; asocasint(lock, 0, key) != 0; ASOLOOP(k)); 50 return 0; 51 } 52 return -1; 53 } 54 55 #endif 56