Pthreads - Can I detach from a thread and then join in main?

Question

What I want to do is something on lines of...

pthread_create(&producer_thread, &to_join, producer_routine, &queue);
pthread_detach(producer_thread);
...
...
pthread_join(producer_thread, NULL);

Is this possible in some way, on running the above code, it is unable to join the thread.

Are you familiar with the [XY problem](http://xyproblem.info)? — Iharob Al Asimi, Aug 26 '16 at 21:35
No. Detaching a thread makes it permanently un-joinable. If you are in control of the thread function, however, then you can roll your own mechanism for waiting on specific detached threads. — John Bollinger, Aug 26 '16 at 21:54
Always a good idea to read the [man page](http://man7.org/linux/man-pages/man3/pthread_detach.3.html): "Once a thread has been detached, it can't be joined with pthread_join(3) or be made joinable again." — kaylum, Aug 26 '16 at 21:55

score 6 · Accepted Answer · edited Aug 27 '16 at 14:54

6

Once detached, it's not possible to join anymore.

From Notes on pthread_detach()'s man page:

Once a thread has been detached, it can't be joined with pthread_join(3) or be made joinable again.

edited Aug 27 '16 at 14:54

alk

answered Aug 26 '16 at 22:08

Max Douglas

1 Answers1