tree dc89c2e655ea8e7113f719a73b56ffae15be321b
parent 31d08cde9f8091d348de46e4e4d872f718c4ab94
author Edwin Kempin <ekempin@google.com> 1560336028 +0200
committer Edwin Kempin <ekempin@google.com> 1560423600 +0200

Log warning when LoggingContext of background thread is not initially empty

When we execute work in a background thread we copy the logging context
to it and unset it before we return it to the thread pool. If we get a
thread from the pool that has a non-empty logging context this is
unexpected and we want to know about it.

Also add a clear() method to LoggingContext to make unsetting the
logging context easier.

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: Ic40ce525f5f4508fe4eb56d78a704256a98b8e0c