Does ZeroMQ support communication among fixed priority threads using
inproc transport? It looks to me like ZeroMQ uses malloc to
allocate/free messages, which implies a shared lock on a shared heap. If
a low priority thread gets the lock and a medium priority thread
preempts it, can't that block a high priority thread indefinitely? I
believe OS X and Windows do not have locks with priority ceiling or
priority inheritance protocols, and it appears that Linux offers
priority inheritance but does not use it in malloc/free as implemented
in glibc, so it seems that priority inversion is (still) a potential
problem. Does ZeroMQ offer a solution?
-Roger Dannenberg
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