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      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 }
    129