Indirect Reference Count (Piquer)
- Like reference counting but the stubs (object descriptors) keeps
also a counter.
- Each stub keeps a field indicating from wich process was received
the reference the first time (its father).
- Each time the owner of o sends a reference to Q, P increments
the counter stored in o.
- Each time a process Q keeping a stub r for o, sends a reference to
R, Q increments the counter stored in r.
- When a process Q' detects that a stub r is no more reachable locally
and its counter is 0, it sends a clean call to its father and
recycles the stub.
- When the owner detects that the counter is 0, it may recycle the
object.
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