[Webkit-unassigned] [Bug 158004] Modern IDB: TransactionOperations from a worker thread might be destroyed on main thread

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=158004

--- Comment #1 from Brady Eidson <beidson at apple.com> ---
We definitely need to destroy these things on the worker thread. Tragic things might happen if we don't.

Each WorkerThread has a WorkerRunLoop, which handles ScriptExecutionContext::Tasks nonstop, and a WTF::RunLoop, which is normal 100% tied up running the WorkerRunLoop.

There's a few inherent races on the main thread here.

The main thread can check if the ScriptExecutionContext still exists and, if so, post a task to it. Problem is that by the time it posts the task, the ScriptExecutionContext might have been terminated (in a normal bad case) or even destroyed (in a tragic bad case)

Assuming that problem is solved, and we reliably check if the ScriptExecutionContext is still there, discover it's not, and then decide to post to the WorkerThread's WTF::RunLoop, there's no guarantee the RunLoop is still running and accepting tasks.

Some re-architecting will be necessary here.

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