regress/sys/kern/mutex2/test_mutex2.c

   1 /*      $NetBSD: test_mutex2.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_mutex2.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        32
  43 #define SECONDS         60
  44
  45 int     testcall(struct lwp *, void *, register_t *);
  46 void    thread1(void *);
  47 void    thread_enter(void);
  48
  49 lwp_t           *test_threads[NTHREADS];
  50 kmutex_t        test_mutex;
  51 kcondvar_t      test_cv;
  52 int             test_count;
  53 int             test_exit;
  54
  55 static int primes[NTHREADS] = {
  56         131, 137, 139, 149,
  57         151, 157, 163, 167,
  58         173, 179, 181, 191,
  59         193, 197, 199, 211,
  60         223, 227, 229, 233,
  61         239, 241, 251, 257,
  62         263, 269, 271, 277,
  63         281, 283, 293, 307,
  64 };
  65
  66 void
  67 thread_exit(void)
  68 {
  69
  70         mutex_enter(&test_mutex);
  71         if (--test_count == 0)
  72                 cv_signal(&test_cv);
  73         mutex_exit(&test_mutex);
  74         kthread_exit(0);
  75 }
  76
  77 void
  78 thread1(void *cookie)
  79 {
  80         int count;
  81
  82         for (count = 0; !test_exit; count++) {
  83                 mutex_enter(&test_mutex);
  84                 if ((count % *(int *)cookie) == 0)
  85                         yield();
  86                 mutex_exit(&test_mutex);
  87                 if ((count % curproc->p_pid) == 0)
  88                         yield();
  89         }
  90 }
  91
  92 int
  93 testcall(struct lwp *l, void *uap, register_t *retval)
  94 {
  95         int i;
  96
  97         mutex_init(&test_mutex, MUTEX_DEFAULT, IPL_NONE);
  98         cv_init(&test_cv, "testcv");
  99
 100         printf("test: creating threads\n");
 101
 102         test_count = NTHREADS;
 103         test_exit = 0;
 104
 105         for (i = 0; i < test_count; i++)
 106                 kthread_create(0, KTHREAD_MPSAFE, NULL, thread1, &primes[i],
 107                     &test_threads[i], "thread%d", i);
 108
 109         printf("test: sleeping\n");
 110
 111         mutex_enter(&test_mutex);
 112         while (test_count != 0) {
 113                 (void)cv_timedwait(&test_cv, &test_mutex, hz * SECONDS);
 114                 test_exit = 1;
 115         }
 116         mutex_exit(&test_mutex);
 117
 118         printf("test: finished\n");
 119
 120         cv_destroy(&test_cv);
 121         mutex_destroy(&test_mutex);
 122
 123         return 0;
 124 }