loop: expose io_uring setup flags through Options#228
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Resolves the io_uring backend's init TODO: callers that own the ring's threading discipline can request e.g. IORING_SETUP_SINGLE_ISSUER | IORING_SETUP_COOP_TASKRUN | IORING_SETUP_DEFER_TASKRUN. Default 0 keeps today's behavior. The Options doc records the DEFER_TASKRUN contract: completion task-work only flushes on GETEVENTS entries, so such a loop must run in a waiting mode.
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Resolves the io_uring backend's init TODO: callers that own the ring's threading discipline can request e.g. IORING_SETUP_SINGLE_ISSUER | IORING_SETUP_COOP_TASKRUN | IORING_SETUP_DEFER_TASKRUN. Default 0 keeps today's behavior. The Options doc records the DEFER_TASKRUN contract: completion task-work only flushes on GETEVENTS entries, so such a loop must run in a waiting mode.