regress/sys/kern/rwlock1/test_rwlock1.c

   1 /*      $NetBSD: test_rwlock1.c,v 1.5 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_rwlock1.c,v 1.5 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_exit(void);
  48
  49 lwp_t           *test_threads[NTHREADS];
  50 kmutex_t        test_mutex;
  51 krwlock_t       test_rwlock;
  52 kcondvar_t      test_cv;
  53 int             test_count;
  54 int             test_exit;
  55
  56 static int primes[NTHREADS] = {
  57          17,  19,  23,  29,
  58          31,  37,  41,  43,
  59          47,  53,  59,  61,
  60          67,  71,  73,  79,
  61          83,  89,  97, 101,
  62         103, 107, 109, 113,
  63         127, 131, 137, 139,
  64         149, 151, 157, 163,
  65 };
  66
  67 void
  68 thread_exit(void)
  69 {
  70
  71         mutex_enter(&test_mutex);
  72         if (--test_count == 0)
  73                 cv_signal(&test_cv);
  74         mutex_exit(&test_mutex);
  75         kthread_exit(0);
  76 }
  77
  78 void
  79 thread1(void *cookie)
  80 {
  81         int count;
  82         krw_t op;
  83
  84         for (count = 0; !test_exit; count++) {
  85                 if (count % *(int *)cookie == 0)
  86                         op = RW_WRITER;
  87                 else
  88                         op = RW_READER;
  89                 rw_enter(&test_rwlock, op);
  90                 if ((arc4random() % 11) == 0)
  91                         yield();
  92                 rw_exit(&test_rwlock);
  93                 if ((arc4random() % 23) == 0)
  94                         yield();
  95         }
  96
  97         thread_exit();
  98 }
  99
 100 int
 101 testcall(struct lwp *l, void *uap, register_t *retval)
 102 {
 103         int i;
 104
 105         mutex_init(&test_mutex, MUTEX_DEFAULT, IPL_NONE);
 106         rw_init(&test_rwlock);
 107         cv_init(&test_cv, "testcv");
 108
 109         printf("test: creating threads\n");
 110
 111         test_count = NTHREADS;
 112         test_exit = 0;
 113
 114         for (i = 0; i < test_count; i++)
 115                 kthread_create(0, KTHREAD_MPSAFE, NULL, thread1, &primes[i],
 116                     &test_threads[i], "thread%d", i);
 117
 118         printf("test: sleeping\n");
 119
 120         mutex_enter(&test_mutex);
 121         while (test_count != 0) {
 122                 (void)cv_timedwait(&test_cv, &test_mutex, hz * SECONDS);
 123                 test_exit = 1;
 124         }
 125         mutex_exit(&test_mutex);
 126
 127         printf("test: finished\n");
 128
 129         cv_destroy(&test_cv);
 130         rw_destroy(&test_rwlock);
 131         mutex_destroy(&test_mutex);
 132
 133         return 0;
 134 }