Enum SendAction 

enum SendAction {
    DeliverDirect {
        was_active: bool,
    },
    BecomeSpawner {
        own_seq: u64,
    },
    Queued,
    Refused(String),
}

What decide_send_action determined a message’s fate should be — see its own doc comment and PersistentInner::spawning_in_progress.

Variants

DeliverDirect

The process is already running — deliver directly, no spawn decision involved at all. The turn is already marked active: the decision reserves it under the same inner acquisition, so an automated send cannot see “idle” in the gap before the write (codex P1 on #3562). was_active is the pre-reservation state, for the caller to start the heartbeat and to hand the turn back if the write fails.

Fields

was_active: bool

BecomeSpawner

Nobody else is currently spawning — this caller claimed the exclusive right to do so and its message has already been enqueued for the post-spawn drain. own_seq is that enqueued message’s QueuedMessage::seq, handed back so the caller can later tell release_spawn_claim_and_drain_queue exactly which entry was its own (issue #2365 — content matching could discard a different, identical-text message instead).

Fields

own_seq: u64

Queued

Another caller is already spawning (or a retry-batch flush holds the drain claim — issue #2367) — this message has been enqueued for that claim-holder’s own drain to deliver.

Refused(String)

A kill is pending and the dying process still holds stdin: neither written nor queued, reported to the sender as this error instead. See decide_send_action.