1da2e3ebdSchin /*********************************************************************** 2da2e3ebdSchin * * 3da2e3ebdSchin * This software is part of the ast package * 4*b30d1939SAndy Fiddaman * Copyright (c) 1985-2012 AT&T Intellectual Property * 5da2e3ebdSchin * and is licensed under the * 6*b30d1939SAndy Fiddaman * Eclipse Public License, Version 1.0 * 77c2fbfb3SApril Chin * by AT&T Intellectual Property * 8da2e3ebdSchin * * 9da2e3ebdSchin * A copy of the License is available at * 10*b30d1939SAndy Fiddaman * http://www.eclipse.org/org/documents/epl-v10.html * 11*b30d1939SAndy Fiddaman * (with md5 checksum b35adb5213ca9657e911e9befb180842) * 12da2e3ebdSchin * * 13da2e3ebdSchin * Information and Software Systems Research * 14da2e3ebdSchin * AT&T Research * 15da2e3ebdSchin * Florham Park NJ * 16da2e3ebdSchin * * 17da2e3ebdSchin * Glenn Fowler <gsf@research.att.com> * 18da2e3ebdSchin * David Korn <dgk@research.att.com> * 19da2e3ebdSchin * Phong Vo <kpv@research.att.com> * 20da2e3ebdSchin * * 21da2e3ebdSchin ***********************************************************************/ 22da2e3ebdSchin #pragma prototyped 23da2e3ebdSchin 24*b30d1939SAndy Fiddaman #include <aso.h> 25da2e3ebdSchin 26da2e3ebdSchin int asolock(unsigned int volatile * lock,unsigned int key,int type)27*b30d1939SAndy Fiddamanasolock(unsigned int volatile* lock, unsigned int key, int type) 28da2e3ebdSchin { 29*b30d1939SAndy Fiddaman unsigned int k; 30da2e3ebdSchin 31*b30d1939SAndy Fiddaman if (key) 32*b30d1939SAndy Fiddaman switch (type) 33*b30d1939SAndy Fiddaman { 34*b30d1939SAndy Fiddaman case ASO_UNLOCK: 35*b30d1939SAndy Fiddaman if (*lock != 0) 36*b30d1939SAndy Fiddaman { 37*b30d1939SAndy Fiddaman if (*lock != key) 38*b30d1939SAndy Fiddaman return -1; 39*b30d1939SAndy Fiddaman *lock = 0; 40*b30d1939SAndy Fiddaman } 41*b30d1939SAndy Fiddaman return 0; 42*b30d1939SAndy Fiddaman case ASO_TRYLOCK: 43*b30d1939SAndy Fiddaman if (*lock != key) 44*b30d1939SAndy Fiddaman { 45*b30d1939SAndy Fiddaman if (*lock != 0) 46*b30d1939SAndy Fiddaman return -1; 47*b30d1939SAndy Fiddaman *lock = key; 48*b30d1939SAndy Fiddaman } 4934f9b3eeSRoland Mainz return 0; 50*b30d1939SAndy Fiddaman case ASO_LOCK: 51*b30d1939SAndy Fiddaman case ASO_SPINLOCK: 52*b30d1939SAndy Fiddaman *lock = key; 5334f9b3eeSRoland Mainz return 0; 54*b30d1939SAndy Fiddaman } 55*b30d1939SAndy Fiddaman return -1; 56da2e3ebdSchin } 57