1 /* $OpenBSD: mutex.h,v 1.2 2007/08/25 18:36:47 kettenis 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 28 #ifndef _MACHINE_MUTEX_H_ 29 #define _MACHINE_MUTEX_H_ 30 31 struct mutex { 32 __volatile void *mtx_owner; /* mutex.S relies upon this being first */ 33 int mtx_wantipl; 34 int mtx_oldipl; 35 }; 36 37 #define MUTEX_INITIALIZER(ipl) { NULL, ipl, 0 } 38 39 #ifdef DIAGNOSTIC 40 #define MUTEX_ASSERT_LOCKED(mtx) do { \ 41 if ((mtx)->mtx_owner != curcpu()) \ 42 panic("mutex %p not held in %s", (mtx), __func__); \ 43 } while (0) 44 45 #define MUTEX_ASSERT_UNLOCKED(mtx) do { \ 46 if ((mtx)->mtx_owner == curcpu()) \ 47 panic("mutex %p held in %s", (mtx), __func__); \ 48 } while (0) 49 #else 50 #define MUTEX_ASSERT_LOCKED(mtx) do { } while (0) 51 #define MUTEX_ASSERT_UNLOCKED(mtx) do { } while (0) 52 #endif 53 54 #define MUTEX_OLDIPL(mtx) (mtx)->mtx_oldipl 55 56 #endif 57