lock.h revision 1.1
1/* $NetBSD: lock.h,v 1.1 2000/03/19 14:56:53 ragge Exp $ */ 2 3/* 4 * Copyright (c) 2000 Ludd, University of Lule}, Sweden. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed at Ludd, University of Lule}. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33#ifndef _VAX_LOCK_H_ 34#define _VAX_LOCK_H_ 35 36static __inline__ void 37cpu_simple_lock_init(__volatile struct simplelock *alp) 38{ 39 alp->lock_data = SIMPLELOCK_UNLOCKED; 40} 41 42static __inline__ void 43cpu_simple_lock(__volatile struct simplelock *alp) 44{ 45 __asm__ __volatile ("1:;bbssi $0, (%0), 1b" 46 : /* No output */ 47 : "r"(&alp->lock_data)); 48} 49 50static __inline__ void 51cpu_simple_unlock(__volatile struct simplelock *alp) 52{ 53 alp->lock_data = SIMPLELOCK_UNLOCKED; 54} 55 56static __inline__ int 57cpu_simple_lock_try(__volatile struct simplelock *alp) 58{ 59 register int ret; 60 61 __asm__ __volatile ("movl $0,%0;bbssi $0,(%1),1f;incl %0;1:" 62 : "&=r"(ret) 63 : "r"(&alp->lock_data)); 64 65 return ret; 66} 67 68#endif /* _VAX_LOCK_H_ */ 69 70