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src: cancel pending delayed platform tasks on exit
Worker threads need an event loop without active libuv handles in order to shut down. One source of handles that was previously not accounted for were delayed V8 tasks; these create timers that would be standing in the way of clearing the event loop. To solve this, keep track of the scheduled tasks in a list and close their timer handles before the corresponding isolate/loop is removed from the platform. It is not clear from the V8 documentation what the expectation is with respect to pending background tasks at the end of the isolate lifetime; however, an alternative approach of executing these scheduled tasks when flushing them led to an infinite loop of tasks scheduling each other; so it seems safe to assume that the behaviour implemented in this patch is at least acceptable. Original-PR-URL: ayojs/ayo#120 Original-Reviewed-By: Stephen Belanger <[email protected]> PR-URL: #16700 Reviewed-By: James M Snell <[email protected]>
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