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What are the units of the timeout parameter in the SYS/BIOS IPC MessageQ_get

I want to call MessageQ_get but NOT have it post forever.  The signature of this function is: 

status = MessageQ_get(messageQ, &msg, timeout)
I have looked through the IPC manual, MessageQ.h and MessageQ.c, and have scoured the online forums and can't seem to find any reference to the units of timeout.  Does anybody happen to know what they are?  Clock cycles, mSec, uSec?