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      1 /*	$NetBSD: lockme.c,v 1.1 2011/01/06 13:12:52 pooka Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
      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  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
     17  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
     18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
     21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
     23  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
     25  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
     27  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include <sys/cdefs.h>
     31 #if !defined(lint)
     32 __RCSID("$NetBSD: lockme.c,v 1.1 2011/01/06 13:12:52 pooka Exp $");
     33 #endif /* !lint */
     34 
     35 #include <sys/param.h>
     36 #include <sys/kmem.h>
     37 #include <sys/mutex.h>
     38 #include <sys/rwlock.h>
     39 
     40 #include "kernspace.h"
     41 
     42 struct somemem {
     43 	char foo;
     44 	kmutex_t mutexetum;
     45 	char oof;
     46 };
     47 
     48 void
     49 rumptest_lockme(enum locktest what)
     50 {
     51 	struct somemem *some;
     52 	kmutex_t mtx;
     53 	krwlock_t rw;
     54 
     55 	rw_init(&rw);
     56 	mutex_init(&mtx, MUTEX_DEFAULT, IPL_NONE);
     57 
     58 	switch (what) {
     59 	case LOCKME_MTX:
     60 		mutex_enter(&mtx);
     61 		mutex_enter(&mtx);
     62 		break;
     63 	case LOCKME_RWDOUBLEX:
     64 		rw_enter(&rw, RW_WRITER);
     65 		rw_enter(&rw, RW_WRITER);
     66 		break;
     67 	case LOCKME_RWRX:
     68 		rw_enter(&rw, RW_READER);
     69 		rw_enter(&rw, RW_WRITER);
     70 		break;
     71 	case LOCKME_RWXR:
     72 		rw_enter(&rw, RW_WRITER);
     73 		rw_enter(&rw, RW_READER);
     74 		break;
     75 	case LOCKME_DOUBLEINIT:
     76 		mutex_init(&mtx, MUTEX_DEFAULT, IPL_NONE);
     77 		break;
     78 	case LOCKME_DOUBLEFREE:
     79 		mutex_destroy(&mtx);
     80 		mutex_destroy(&mtx);
     81 		break;
     82 	case LOCKME_DESTROYHELD:
     83 		mutex_enter(&mtx);
     84 		mutex_destroy(&mtx);
     85 		break;
     86 	case LOCKME_MEMFREE:
     87 		some = kmem_alloc(sizeof(*some), KM_SLEEP);
     88 		mutex_init(&some->mutexetum, MUTEX_DEFAULT, IPL_NONE);
     89 		kmem_free(some, sizeof(*some));
     90 		break;
     91 	}
     92 }
     93