On Thu, 2018-02-08 at 17:56 -0600, Benjamin Marzinski wrote:
> ct->running is now an atomic variable. When the thread is started
> it is set to 1. When the checker wants to kill a thread, it
> sets the value to 0 and reads the previous value. If it was 1,
> the checker cancels the thread. If it was 0, the nothing needs to be
> done. After the checker has dealt with the thread, it sets ct-
> to NULL.
> When the thread is done, it atomicalllys sets the value of ct-
> to 0 and reads the previous value. If it was 1, the thread just
> If it was 0, then the checker is trying to cancel the thread, and so
> the thread calls pause(), which is a cancellation point.
I'm missing one thing here. My poor brain is aching.
cleanup_func() can be entered in two ways: a) if the thread has been
cancelled and passed a cancellation point already, or b) if it exits
normally and calls pthread_cleanup_pop().
In case b), waiting for the cancellation request by calling pause()
makes sense to me. But in case a), the thread has already seen the
cancellation request - wouldn't calling pause() cause it to sleep
Dr. Martin Wilck <mwi...@suse.com>, Tel. +49 (0)911 74053 2107
SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
dm-devel mailing list