Useful for general asynchronous works.
Created attachment 315618 [details] Patch Just putting this patch to bugzilla. When I need it, I'll revise it and request for review
Created attachment 342125 [details] Patch
Created attachment 342126 [details] Patch
Created attachment 342133 [details] Patch
Created attachment 342147 [details] Patch
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Created attachment 342167 [details] Patch
Basics of the implementation LGTM. I'd propose someone more familiar with AutomaticThreads gives final approval.
Committed r232619: <https://trac.webkit.org/changeset/232619>
<rdar://problem/40928389>
*** Bug 186371 has been marked as a duplicate of this bug. ***