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Snapshot read of dispatcher capacity. Returns immediately, never blocks. The non-blocking counterpart to .dispatcher_gate().
.dispatcher_gate()
.dispatcher_try_gate(disp)
Logical TRUE if submission would not block (queued bytes below the memory budget set on .dispatcher_start(), or unbounded), FALSE
TRUE
.dispatcher_start()
FALSE
if at or over the budget. NULL if disp is invalid.
NULL
disp
External pointer to dispatcher handle.