Conflict with cin() & pthread

[unclefester]

I created a thread named thread which calls the function run(). Inside run, it's supposed to ask for user input. However, when I execute the program, it simply terminates. Is there a problem using cin with threads?

main()
{   pthread_t thread;
    pthread_create(&thread,NULL,run,NULL);
}

void *run(void *ptr)
{   int nRate;
    cin >> nRate;
}

[ropez]

You have to make main() wait for the thread to terminate. The call to pthread_create() returns immediately, and the program terminates when main() returns.

Here's a demonstration (DO NOT DO THIS):

int main() 
{   pthread_t thread;
    pthread_create(&thread, NULL, run, NULL);
    sleep(10);
}

void *run(void *ptr) 
{   int nRate;
    cout << "You have 10 seconds to answer" << endl;
    cin >> nRate;
}

What you really need is to make main() wait exactly until the other thread has terminated. There is a function for this called pthread_join():

int main() 
{   pthread_t thread;
    pthread_create(&thread, NULL, run, NULL);
    pthread_join(thread, NULL);
}

void *run(void *ptr) 
{   int nRate;
    cout << "Take as long as you want" << endl;
    cin >> nRate;
}

[unclefester]

Thank you ropez =)