1 /* $OpenBSD: mutex.h,v 1.3 2005/07/18 02:43:25 fgsch Exp $ */ 2 3 /* 4 * Copyright (c) 2004 Artur Grabowski <art@openbsd.org> 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 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 17 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY 18 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 19 * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 #ifndef _I386_MUTEX_H_ 28 #define _I386_MUTEX_H_ 29 30 /* 31 * XXX - we don't really need the mtx_lock field, we can use mtx_oldipl 32 * as the lock to save some space. 33 */ 34 struct mutex { 35 __volatile int mtx_lock; 36 int mtx_wantipl; 37 int mtx_oldipl; 38 void *mtx_owner; 39 }; 40 41 #define MUTEX_INITIALIZER(IPL) { 0, (IPL), 0, NULL } 42 43 #define MUTEX_ASSERT_LOCKED(mtx) do { \ 44 if ((mtx)->mtx_lock != 1 || \ 45 (mtx)->mtx_owner != curcpu()) \ 46 panic("mutex %p not held in %s", (mtx), __func__); \ 47 } while (0) 48 49 #define MUTEX_ASSERT_UNLOCKED(mtx) do { \ 50 if ((mtx)->mtx_lock == 1 && \ 51 (mtx)->mtx_owner == curcpu()) \ 52 panic("mutex %p held in %s", (mtx), __func__); \ 53 } while (0) 54 55 #define MUTEX_OLDIPL(mtx) (mtx)->mtx_oldipl 56 57 #endif 58