Refactor IOCP::OverlappedOperation internalize handle and wait_for_completion
#14724
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ysbaddaden
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Jun 18, 2024
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I found a workaround for the special case of an accept timeout: b919f3b This is quite simple and only temporary. The handling of timeouts will change significantly in a follow-up. |
ysbaddaden
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When an overlapped operation gets cancelled, we still need to wait for completion of the operation (with status `ERROR_OPERATION_ABORTED`) before it can be freed. Previously we stored a reference to cancelled operations in a linked list and removed them when complete. This allows continuing executing the fiber directly after the cancellation is triggered, but it's also quite a bit of overhead. Also it makes it impossible to allocate operations on the stack. Cancellation is triggered when an operation times out. The change in this patch is that after a timeout the fiber is suspended again, expecting completion via the event loop. Then the operation can be freed. * Removes the `CANCELLED` state. It's no longer necessary, we only need to distinguish whether a fiber was woken up due to timeout or completion. A follow-up will further simplify the state handling. * Replace special timeout event and fiber scheduling logic with generic `sleep` and `suspend` * Drops `@@cancelled` linked list. * Drops the workaround from #14724 (comment)
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Moves the
schedule_overlappedoverlapped method intoOverlappedOperationand call it directly from the result methods, reducing the external API.@handlebecomes a property ofOverlappedOperationwhich will be necessary for a follow-up refactor anyway.