xref: /freebsd/contrib/netbsd-tests/lib/libpthread/t_preempt.c (revision a5921bc3653e2e286715e6fe8d473ec0d02da38c)
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