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Overlays and OpenLDAP multi-threading model


I'm starting to see how overlays works to write one. But I've got a
doubt and I'm asking
to be sure: Is the overlay stack called within each thread ? If so, I
think it can't block an
entire thread pool, right ?

My concern is about performance. The overlay I'm writing will only
take place in some
backend data modifications but it can be quite slow in terms of
OpenLDAP connection handling,
because it will be communicating via IPC with another process... If
this overlay blocks only one
connection, it's ok. But if it's blocks an entire thread pool, I'll
have to figure out another solution.

Thanks a lot in advance
Lucas Brasilino