regress/sys/kern/mutex1/test_mutex1.c

   1 /*      $NetBSD: test_mutex1.c,v 1.4 2008/03/28 20:28:27 ad Exp $       */
   2
   3 /*-
   4  * Copyright (c) 2007, 2008 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Andrew Doran.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __KERNEL_RCSID(0, "$NetBSD: test_mutex1.c,v 1.4 2008/03/28 20:28:27 ad Exp $");
  34
  35 #include <sys/param.h>
  36 #include <sys/ioctl.h>
  37 #include <sys/systm.h>
  38 #include <sys/proc.h>
  39 #include <sys/kthread.h>
  40 #include <sys/kernel.h>
  41
  42 #define NTHREADS        9
  43 #define SECONDS         60
  44
  45 int     testcall(struct lwp *, void *, register_t *);
  46 void    thread1(void *);
  47 void    thread2(void *);
  48 void    thread3(void *);
  49 void    thread_exit(void);
  50
  51 lwp_t           *test_threads[NTHREADS];
  52 kmutex_t        test_mutex;
  53 kcondvar_t      test_cv;
  54 int             test_count;
  55 int             test_exit;
  56
  57 void
  58 thread_exit(void)
  59 {
  60
  61         mutex_enter(&test_mutex);
  62         if (--test_count == 0)
  63                 cv_signal(&test_cv);
  64         mutex_exit(&test_mutex);
  65         kthread_exit(0);
  66 }
  67
  68 /*
  69  * test_mutex -> kernel_lock
  70  */
  71 void
  72 thread1(void *cookie)
  73 {
  74         int count;
  75
  76         for (count = 0; !test_exit; count++) {
  77                 mutex_enter(&test_mutex);
  78                 KERNEL_LOCK(1, curlwp);
  79                 if ((count % 11) == 0)
  80                         yield();
  81                 mutex_exit(&test_mutex);
  82                 KERNEL_UNLOCK_ONE(curlwp);
  83                 if ((count % 17) == 0)
  84                         yield();
  85         }
  86
  87         thread_exit();
  88 }
  89
  90 /*
  91  * kernel_lock -> test_mutex
  92  */
  93 void
  94 thread2(void *cookie)
  95 {
  96         int count;
  97
  98         for (count = 0; !test_exit; count++) {
  99                 KERNEL_LOCK(1, curlwp);
 100                 mutex_enter(&test_mutex);
 101                 if ((count % 401) == 0)
 102                         yield();
 103                 KERNEL_UNLOCK_ONE(curlwp);
 104                 mutex_exit(&test_mutex);
 105                 if ((count % 19) == 0)
 106                         yield();
 107         }
 108
 109         thread_exit();
 110 }
 111
 112 /*
 113  * test_mutex without kernel_lock, to provide pressure
 114  */
 115 void
 116 thread3(void *cookie)
 117 {
 118         int count;
 119
 120         for (count = 0; !test_exit; count++) {
 121                 mutex_enter(&test_mutex);
 122                 DELAY(10);
 123                 if ((count % 101) == 0)
 124                         yield();
 125                 mutex_exit(&test_mutex);
 126                 if ((count % 23) == 0)
 127                         yield();
 128         }
 129
 130         thread_exit();
 131 }
 132
 133 int
 134 testcall(struct lwp *l, void *uap, register_t *retval)
 135 {
 136         void (*func)(void *);
 137         int i;
 138
 139         mutex_init(&test_mutex, MUTEX_DEFAULT, IPL_NONE);
 140         cv_init(&test_cv, "testcv");
 141
 142         printf("test: creating threads\n");
 143
 144         test_count = NTHREADS;
 145         test_exit = 0;
 146
 147         for (i = 0; i < test_count; i++) {
 148                 switch (i % 3) {
 149                 case 0:
 150                         func = thread1;
 151                         break;
 152                 case 1:
 153                         func = thread2;
 154                         break;
 155                 case 2:
 156                         func = thread3;
 157                         break;
 158                 }
 159                 kthread_create(0, KTHREAD_MPSAFE, NULL, func, NULL,
 160                     &test_threads[i], "thread%d", i);
 161         }
 162
 163         printf("test: sleeping\n");
 164
 165         mutex_enter(&test_mutex);
 166         while (test_count != 0) {
 167                 (void)cv_timedwait(&test_cv, &test_mutex, hz * SECONDS);
 168                 test_exit = NTHREADS;
 169         }
 170         mutex_exit(&test_mutex);
 171
 172         printf("test: finished\n");
 173
 174         cv_destroy(&test_cv);
 175         mutex_destroy(&test_mutex);
 176
 177         return 0;
 178 }