[LTP] [PATCH v1] connectors/cn_pec: improve reliability

[Joerg Vehlow]

Hi Petr,

On 8/6/2021 9:48 AM, Petr Vorel wrote:
>
> If I understand the code correctly, pec_listener keeps receiving msg from PEC
> until got signaled by kill. We generally try to avoid sleep in tests [1].
>
> @Joerg: I'm not sure if it's reasonable to add another signal handler in which
> pec_listener would print number of already handled requests (with write() as
> printf() is not reentrant). Then we could loop for certain time before sending INT.
>
The problem is, that it is hard to know, if all expected events were 
received. pec_listener receives events from all processes.
The only way to reliably handle the issue without sleeping is tracking 
exit-events in pec_listener and to tell it to die, once it received an 
exit event from event_generator.
Only then we can be sure, that all events generated by the generator 
(and hopefully all it's children) were received.

We could also get rid of the other sleep (after starting the listener 
using some kind of synchronization (I guess right after 
PROC_CN_MCAST_LISTEN should work). I think checkpoints are not part of 
the new lib...

Joerg