With FreeBSD 8.0 it seems like you can't block pending but undelivered signals

[Richard Sharpe]

Hi folks,

I have looked more at the AIO and signal issues I am seeing with
FreeBSD. This is FreeBSD 8.0.

After instrumenting the code in lib/tevent/tevent_signal.c, I know:

1. Only one thread, the main thread is receiving signals.

2. When we hit 64 siginfo_t structures in our array, we try to stop
the delivery of further signals (signum=68, one of the RT signals
under FreeBSD.)

3. They keep coming, overwriting earlier ones and causing replays of
already handled events.

I will be reading the FreeBSD source code some more today to try to
figure out what is going on.

The work-around is to change the size of the array for siginfo_t
structures to 128 from 64 so it is larger than the number of pending
AIO requests (100).

-- 
Regards,
Richard Sharpe
(何以解憂？唯有杜康。--曹操)