1 /*-
2 * Copyright (c) 2017 The NetBSD Foundation, Inc.
3 * All rights reserved.
4 *
5 * This code is derived from software contributed to The NetBSD Foundation
6 * by Joerg Sonnenberger.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 * POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include <dlfcn.h>
31 #include <err.h>
32 #include <pthread.h>
33 #include <stdio.h>
34
35 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
36 static pthread_cond_t cond1 = PTHREAD_COND_INITIALIZER;
37 static pthread_cond_t cond2 = PTHREAD_COND_INITIALIZER;
38
39 static void *
thread_helper(void * arg)40 thread_helper(void *arg)
41 {
42 void (*testfunc)(void) = arg;
43 testfunc();
44
45 pthread_mutex_lock(&mutex);
46 pthread_cond_broadcast(&cond1);
47 pthread_mutex_unlock(&mutex);
48
49 pthread_mutex_lock(&mutex);
50 pthread_cond_wait(&cond2, &mutex);
51 pthread_mutex_unlock(&mutex);
52
53 return NULL;
54 }
55
56 int
main(void)57 main(void)
58 {
59 void *dso;
60 void (*testfunc)(void);
61 pthread_t thread;
62
63 dso = dlopen("libh_helper_dso3.so", RTLD_LAZY);
64 if (dso == NULL)
65 errx(1, "%s", dlerror());
66 testfunc = dlsym(dso, "testfunc");
67 if (testfunc == NULL)
68 errx(1, "%s", dlerror());
69
70 pthread_mutex_lock(&mutex);
71
72 if (pthread_create(&thread, NULL, thread_helper, testfunc))
73 err(1, "pthread_create");
74
75 pthread_cond_wait(&cond1, &mutex);
76 pthread_mutex_unlock(&mutex);
77
78 printf("before dlclose\n");
79 dlclose(dso);
80 printf("after dlclose\n");
81 dso = dlopen("libh_helper_dso3.so", RTLD_LAZY);
82 if (dso == NULL)
83 errx(1, "%s", dlerror());
84 dlclose(dso);
85
86 pthread_mutex_lock(&mutex);
87 pthread_cond_signal(&cond2);
88 pthread_mutex_unlock(&mutex);
89
90 if (pthread_join(thread, NULL))
91 err(1, "pthread_join");
92 return 0;
93 }
94