Struct arti_rpcserver::mgr::Inner
source · pub(crate) struct Inner {
connections: WeakValueHashMap<ConnectionId, Weak<Connection>>,
}
Expand description
The RpcMgr
’s state. This is kept inside a lock for interior mutability.
§Lock hierarchy
This system has, relevantly to the RPC code, three locks. In order from outermost (acquire earlier) to innermost (acquire later):
Connection
.inner
RpcMgr
.inner
RwLock<rpc::DispatchTable>
(found inRpcMgr
.dispatch_table
andConnection
.dispatch_table
)
To avoid deadlock, when more than one of these locks is acquired, they must be acquired in an order consistent with the order listed above.
(This ordering is slightly surprising: normally a lock covering more-global state would be “outside” (or “earlier”) compared to one covering more-narrowly-relevant state.)
Fields§
§connections: WeakValueHashMap<ConnectionId, Weak<Connection>>
A map from ConnectionId
to weak Connection
references.
We use this map to give connections a manager-global identifier that can be used to identify them from a SOCKS connection (or elsewhere outside of the RPC system).
We could use a generational arena here, but there isn’t any point: since these identifiers are global, we need to keep them secure by MACing anything derived from them, which in turn makes the overhead of a HashMap negligible.
Auto Trait Implementations§
impl Freeze for Inner
impl !RefUnwindSafe for Inner
impl Send for Inner
impl Sync for Inner
impl Unpin for Inner
impl !UnwindSafe for Inner
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