cooker: Avoid parser deadlocks

If you make parsing fail (e.g. add something like:

X := "${@d.getVar('MCMACHINES').split()[1]}"

to meson.bbclass, then run "while true; do bitbake -g bash; done"
it will eventually hang. It appears the cancel_join_thread() call the
parsing failure triggers, breaks the results_queue badly enough that it
sits in read() indefintely (called from self.result_queue.get(timeout=0.25)).
The timeout only applies to lock aquisition, not the read call.

I've tried various other approaches such as using cancel_join_thread()
in other places but the only way things don't lock up is to avoid
cancel_join_thread() entirely for results_queue.

I do have a concern that this may adversely affect Ctrl+C handling
but equally, its broken now already and this appears to improve
things.

[YOCTO #14034]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions