Question

I’m just playing around with threads to get used to them, so I wanted to make 20 threads that are all alive at the same time, and wrote this program:

static void * threadFunc(void *str)
{
    sleep(5);
}

int main (int argc, char * argv[])
{

    pthread_t arr[20];

    for(int i = 0; i < 20; i++)
    {
        pthread_create(&arr[i], NULL, threadFunc, (void*)NULL);
        cout << "i=" << i << "\ntotal threads=" << pthread_is_threaded_np() << "\n";
    }
}

But it keeps saying total number of threads is 1. What am I missing here?

Answer 1

What do you think pthread_is_threaded_np() does? Here’s a hint: it’s not what you want.