#include <pthread.h>
#include <cstdio>
#include <unistd.h>
#include <dlfcn.h>

__thread int my_int;

bool go = false;
extern "C" void* run(void* obj) {
    int *(*get_ext_tls)() = (int*(*)()) dlsym(obj, "get_ext_int");
    int *(*get_my_tls)() = (int*(*)()) dlsym(obj, "get_my_int");
    int *ext_int = (int*) dlsym(obj, "ext_int");
    int *my_tls = get_my_tls();
    int *ext_tls = get_ext_tls();
    while(not go)
        usleep(100*1000);

    printf("tid=%x, &my_int=%p, &my_tls=%p, &ext_int=%p, &ext_tls=%p\n",
           (int)pthread_self(), &my_int, my_tls, ext_int, ext_tls);
    return 0;
}
int main() {
    void* obj = dlopen("ext-tls", 0);
    if (not obj)
        fprintf(stderr, "Unable to open dll: %s\n", dlerror());
    
    pthread_t tids[10];
    for(unsigned i=0; i < sizeof(tids)/sizeof(*tids); i++)
        pthread_create(&tids[i], 0, &run, obj);

    fprintf(stderr, "pid: %d\n", getpid());
    sleep(1);
    go = true;
    run(obj);

    for(unsigned i=0; i < sizeof(tids)/sizeof(*tids); i++)
        pthread_join(tids[i], 0);
}