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      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 *
     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
     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