platform

nimony/lib/std/ioring/platform.nim

• const hasEpoll: bool
• const hasKqueue: bool
• const hasIouring: bool

  -d:nimIoringNoUring picks the epoll backend on Linux. iouring is the better default, but it also hides the epoll path: many container sandboxes forbid `iouringsetup`, so the fallback is what actually runs there and it needs to be reachable deliberately — for testing, and for anyone who has to disable iouring for policy reasons.

• const hasIocp: bool

  Windows default: the IOCP proactor (backends/iocp.nim) — the ring's contract is completion-shaped and IOCP serves it directly, with no readiness emulation and no per-connection scheduler-tick stall (see the backend header for the measurements). -d:nimIoringIocp, the opt-in while it was new, is accepted and means nothing now.

• const hasWsaPoll: bool

  -d:nimIoringWsaPoll picks the WSAPoll readiness backend (backends/wsapoll.nim) instead — the same shape as nimIoringNoUring on Linux: the fallback stays reachable deliberately, for testing and for a host where completion ports misbehave (layered service providers are the usual culprit).

• const hasIoPoll: bool
• var backendRelays: BackendRelays
• proc initPlatformBackend()