/* from https://sourceware.org/ml/libc-help/2011-04/msg00000.html */

/* test.c */
/* Compile with "cc -o test test.c -lpthread" */
#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>
#include <dlfcn.h>

int main(void)
{
	int i;
	void *handle;
	pthread_t pt;
	void *(*do_something)(void *);

	handle = dlopen("./test_lib.so", RTLD_LAZY);
	if (!handle) {
		perror("dlopen");
		return EXIT_FAILURE;
	}

	do_something = dlsym(handle, "do_something");
	if (!do_something) {
		perror("dlsym");
		return EXIT_FAILURE;
	}

	for (i = 0; i < 10000; i++) {
		if (pthread_create(&pt, NULL, do_something, NULL)) {
			perror("pthread_create");
			return EXIT_FAILURE;
		}

		if (pthread_join(pt, NULL))  {
			perror("pthread_join");
			return EXIT_FAILURE;
		}
	}

	if (dlclose(handle)) {
		perror("dlclose");
		return EXIT_FAILURE;
	}

	return EXIT_SUCCESS;
}


/* test_lib.c */
/* Compile with "cc -o test_lib.so test_lib.c -fPIC -shared" */
#include <stdlib.h>

static __thread int a;

void *do_something(void *arg)
{
	a = 666;
	return NULL;
}