Return to mutex.c CVS log

Up to [local] / sys / arch / alpha / alpha

Annotation of sys/arch/alpha/alpha/mutex.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: mutex.c,v 1.1 2007/05/05 21:05:43 martin 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: #include <sys/param.h>
        !            29: #include <sys/mutex.h>
        !            30: #include <sys/systm.h>
        !            31:
        !            32: #include <machine/intr.h>
        !            33:
        !            34: #ifdef MULTIPROCESSOR
        !            35: #error This code needs more work
        !            36: #endif
        !            37:
        !            38: /*
        !            39:  * Single processor systems don't need any mutexes, but they need the spl
        !            40:  * raising semantics of the mutexes.
        !            41:  */
        !            42: void
        !            43: mtx_init(struct mutex *mtx, int wantipl)
        !            44: {
        !            45:        mtx->mtx_oldipl = 0;
        !            46:        mtx->mtx_wantipl = wantipl;
        !            47:        mtx->mtx_lock = 0;
        !            48: }
        !            49:
        !            50: void
        !            51: mtx_enter(struct mutex *mtx)
        !            52: {
        !            53:        if (mtx->mtx_wantipl != IPL_NONE)
        !            54:                mtx->mtx_oldipl = _splraise(mtx->mtx_wantipl);
        !            55:        MUTEX_ASSERT_UNLOCKED(mtx);
        !            56:        mtx->mtx_lock = 1;
        !            57: }
        !            58:
        !            59: void
        !            60: mtx_leave(struct mutex *mtx)
        !            61: {
        !            62:        MUTEX_ASSERT_LOCKED(mtx);
        !            63:        mtx->mtx_lock = 0;
        !            64:        if (mtx->mtx_wantipl != IPL_NONE)
        !            65:                splx(mtx->mtx_oldipl);
        !            66: }