05b70c7f11
If a `find_objects` implementation encounters an error, it may release a `ThreadSpecificHandles` on the background thread. Before this patch, this would cause `ThreadSpecificHandles::drop` to block on the currently-running thread, causing a deadlock. This patch changes the drop implementation to first check if it's already on the background thread, in which case it can simply release the resources without blocking on anything. Original Revision: https://phabricator.services.mozilla.com/D258085 Differential Revision: https://phabricator.services.mozilla.com/D258729
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