RT signal queues

Don Howard (dhoward@pobox.com)
Tue, 23 Nov 1999 15:26:14 +0000 (PDT)

I'm working on a server that uses the sigwaitinfo / rt signal approach for IO.
This process uses sigqueue() for inter-thread comunication as well and fcntl
(F_SETSIG/F_SETOWN/F_SETFL) for network IO. I've run into a situation where
the system-wide rt signal queue (if there is such a critter) seems to be full:

> cat /proc/sys/kernel/rtsig-max
> 1024
> cat /proc/sys/kernel/rtsig-nr
> 1024

This, of course, stops the server dead since it can't recieve network events.
This condition does not go away when I shut down the process. If I manually
raise rtsig-max, the server can continue to run. Is there a way to flush the
system rt signal queue?

Could someone clue me in on how rt signals are handled, and on what these
/proc entries represent?

Kernel 2.3.28, up and smp.

-- 
-Don
dhoward@pobox.com




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