tests/lib/libpthread/t_preempt.c

   1 /* $NetBSD: t_preempt.c,v 1.2 2010/11/03 16:10:22 christos Exp $ */
   2
   3 /*
   4  * Copyright (c) 2008 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 CONTRIBUTORS
  17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  26  * POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __COPYRIGHT("@(#) Copyright (c) 2008\
  31  The NetBSD Foundation, inc. All rights reserved.");
  32 __RCSID("$NetBSD: t_preempt.c,v 1.2 2010/11/03 16:10:22 christos Exp $");
  33
  34 #include <errno.h>
  35 #include <fcntl.h>
  36 #include <pthread.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <unistd.h>
  41
  42 #include <atf-c.h>
  43
  44 #include "h_common.h"
  45
  46 pthread_mutex_t mutex;
  47 pthread_cond_t cond;
  48 int started;
  49
  50 #define HUGE_BUFFER    1<<20
  51 #define NTHREADS    1
  52
  53 static void *
  54 threadfunc(void *arg)
  55 {
  56         printf("2: Second thread.\n");
  57
  58         printf("2: Locking mutex\n");
  59         PTHREAD_REQUIRE(pthread_mutex_lock(&mutex));
  60         printf("2: Got mutex.\n");
  61         started++;
  62
  63         PTHREAD_REQUIRE(pthread_mutex_unlock(&mutex));
  64         PTHREAD_REQUIRE(pthread_cond_signal(&cond));
  65         sleep(1);
  66
  67         return NULL;
  68 }
  69
  70 ATF_TC(preempt1);
  71 ATF_TC_HEAD(preempt1, tc)
  72 {
  73         atf_tc_set_md_var(tc, "descr",
  74                 "Checks kernel preemption during a large uiomove");
  75 }
  76 ATF_TC_BODY(preempt1, tc)
  77 {
  78         int i;
  79         ssize_t rv;
  80         pthread_t new;
  81         void *joinval;
  82
  83         char *mem;
  84         int fd;
  85
  86         mem = malloc(HUGE_BUFFER);
  87         ATF_REQUIRE_MSG(mem != NULL, "%s", strerror(errno));
  88
  89         fd = open("/dev/urandom", O_RDONLY, 0);
  90         ATF_REQUIRE_MSG(fd != -1, "%s", strerror(errno));
  91
  92         printf("1: preempt test\n");
  93
  94         PTHREAD_REQUIRE(pthread_cond_init(&cond, NULL));
  95         PTHREAD_REQUIRE(pthread_mutex_init(&mutex, NULL));
  96
  97         PTHREAD_REQUIRE(pthread_mutex_lock(&mutex));
  98
  99         started = 0;
 100
 101         for (i = 0; i < NTHREADS; i++) {
 102                 PTHREAD_REQUIRE(pthread_create(&new, NULL, threadfunc, NULL));
 103         }
 104
 105         while (started < NTHREADS) {
 106                 PTHREAD_REQUIRE(pthread_cond_wait(&cond, &mutex));
 107         }
 108
 109         printf("1: Thread has started.\n");
 110
 111         PTHREAD_REQUIRE(pthread_mutex_unlock(&mutex));
 112         printf("1: After releasing the mutex.\n");
 113
 114         rv = read(fd, mem, HUGE_BUFFER);
 115         close(fd);
 116         ATF_REQUIRE_EQ(rv, HUGE_BUFFER);
 117
 118         PTHREAD_REQUIRE(pthread_join(new, &joinval));
 119
 120         printf("1: Thread joined.\n");
 121 }
 122
 123 ATF_TP_ADD_TCS(tp)
 124 {
 125         ATF_TP_ADD_TC(tp, preempt1);
 126
 127         return atf_no_error();
 128 }