[erlang-questions] Sending a message to a process that no longer exists
Wed Dec 10 05:29:30 CET 2008
Thanks for all the responses.
Becoming a system process (suggested by Bernard Duggan) and catching
Monitoring (suggested by Rapsey) works and provides a bit more
information than catching 'EXIT', e.g. noconnection. (Or will the
'EXIT' message do this too?) erlang:is_process_alive works, but only
for local processes. Also, (as pointed out by Robert Virding),
monitor/2 sends a 'DOWN' message instead of a boolean result that is
immediately stale, (a problem if the process dies just after the send).
Hynek Vychodil pointed me at gen:do_call/4, which is elaborate but
I tried some timings. For local processes, the extra work done by
do_call is substantial, lowering message speed by a factor of 3 (on a
MacBook Pro). For messages to other nodes, the difference is only
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