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OTP behaviour instances (gen_server, gen_fsm, gen_event) can currently
register themselves either locally or globally, and the behaviour
libraries (including gen.erl) support both addressing methods, as well
as the normal Pid and {Name, Node}.
However, there are alternative registry implementations - e.g. gproc -
and one can well imagine other ways of locating a behaviour instance,
e.g. on a node connected only via a TCP tunnel, rather than via
Distributed Erlang. In all these cases, one needs to write extra code
to identify the behaviour instance, even though the instance itself
need not be aware of how it is located.
This patch introduces a new way of locating a behaviour instance:
{via, Module, Name}.
Module is expected to export a subset of the functions in global.erl,
namely:
register_name(Name, Pid) -> yes | no
whereis_name(Name) -> pid() | undefined
unregister_name(Name) -> ok
send(Name, Msg) -> Pid
Semantics are expected to be the same as for global.erl
This can be used in all places where {global, Name} is accepted.
faulty export in gen_fsm_SUITE.erl
await process death in dummy_via:reset()
fix error in gen_[server|fsm]:enter_loop()
fix documentation
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