[apologies for the cross post but it belongs both to arch and net.]
I notice that net/pfil.c and netinet/ip_fw2.c have two copies of
aisimilar but slightly different implementation of
multiple-reader/single-writer locks, which brings up the question(s):
1. should we rather put this code in the generic kernel code so that other
subsystems could make use of it ? E.g. the routing table is certainly
a candidate,
and especially
2. should we implement it right ?
Both implementations are subject to starvation for the writers
(which is indeed a problem here, because we might want to modify
a ruleset and be prevented from doing it because of incoming traffic
that keeps readers active).
Also the PFIL_TRY_WLOCK will in fact be blocking if a writer
is already in - i have no idea how problematic is this in the
way it is actually used.
cheers
luigi
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