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Annotation of sys/arch/i386/include/mutex.h, Revision 1.1.1.1

1.1       nbrk        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