Eio_unix.PrivateSourceAPI for Eio backends only.
type Effect.t += | Await_readable : Unix.file_descr -> unit Effect.t| Await_writable : Unix.file_descr -> unit Effect.t| Get_monotonic_clock : Eio.Time.Mono.ty Eio.Std.r Effect.t| Pipe : Eio.Switch.t -> (source_ty Eio.Std.r * sink_ty Eio.Std.r) Effect.t| Import_file : Fd.t -> File.rw_ty Eio.Std.r Effect.tActions to perform after forking a child process.
A pool of systhreads, to avoid the overhead of creating a new thread for each operation.