Daan De Meyer
54c124eb6c
QmpSlot now stores a back-reference to its QmpClient (mirroring sd_bus_slot) and is exposed as a public refcounted type via qmp_slot_ref/qmp_slot_unref. qmp_client_invoke() gains an optional QmpSlot **ret_slot out-parameter matching sd_bus_call_async(): passing non-NULL hands back a reference whose unref cancels the pending call (the callback is deregistered; a late reply is logged and discarded as unknown-id). Internally slots come in two flavours, following sd_bus's model: floating (owned by the client's pending set, used when ret_slot is NULL) and non-floating (ref held by the caller, slot holds a ref on the client). qmp_slot_disconnect() centralizes the teardown so the reply-dispatched, explicit-cancel, and client-teardown paths all converge on the same idempotent cleanup. qmp_client_call()'s sync slot is now non-floating and observes completion by watching slot->client go NULL instead of set_contains() on an id.
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