Struct PendingFetch 

pub struct PendingFetch {
    pub cx: *mut JSContext,
    pub promise_root: Option<RawValueRootGuard>,
    pub promise_val: Value,
    pub outcome: Arc<Mutex<Option<Result<StealthSyncResult, String>>>>,
    pub kind: ResolveKind,
    /* private fields */
}

A fetch tasklet: pending Promise + event-driven HTTP integration.

Invariants (FetchTaskletLifecycle SM):

• promise_root holds the heap root while the Promise is outstanding; it is released RAII-style when the PendingFetch Box drops (every terminal resolve/reject path ends in that drop).
• has_schedule_callback prevents duplicate ConcurrentTask scheduling.
• outcome is written by on_http_done (HTTPThread) and consumed by resolve_tasklet (JS thread via ConcurrentTask).

Fields

cx: *mut JSContext

SpiderMonkey context that owns the Promise. Only touched on the JS thread.

promise_root: Option<RawValueRootGuard>

RAII heap root (GUARD-A) keeping the pending Promise alive across the async window. None only when rooting failed at spawn (pre-existing degraded path: the unrooted promise_val snapshot below is used).

promise_val: Value

Promise value snapshot taken at spawn. The live value is promise_root.get(0) (updated in place by a moving GC); this is the fallback when rooting failed.

outcome: Arc<Mutex<Option<Result<StealthSyncResult, String>>>>

HTTPThread result slot. None until on_http_done writes the outcome.

kind: ResolveKind

How to materialize the result on the JS thread.

Trait Implementations

impl Send for PendingFetch