test.TestServer.shutdown

Errors

Returns ShutdownFailed when executor closure, lifecycle signaling/waiting, or the blocking waiter fails. Returns CleanupFailed when descriptor-relative cleanup cannot be proved after lifecycle processing.

This consumes the guard, closes its shared no-start executor, and then terminates the retained foreground daemon. Escaped [Server] clones cannot issue later commands.

Cancelling this future before lifecycle ownership transfers leaves the guard responsible for synchronous forced best-effort cleanup. Once this future transfers ownership to its blocking waiter, that waiter completes cleanup even if this future is cancelled; later cleanup failures are unobservable to the cancelled caller.