ProducerReference
Core-owned origin of a cached reservation. Transitions once from unresolved to a terminal resolution. Several references may resolve to the same MultiTile execution identity. Completed cache reuse keeps the same reference; it does not manufacture another execution.
Functions
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Notifications are synchronous, guarded, and outside Mosaic locks. An already terminal reference invokes the listener before this method returns. Closing prevents notification if it wins before invocation is claimed; it neither waits for nor interrupts an already claimed invocation. Callbacks must return promptly without blocking on Mosaic progress.