[Ovmsdev] Improve shutdown of poller

[frog at bunyip.wheelycreek.net]

I've had some hang-ups on shutdown and have been through a few iterations on
working out what is happening.

 

I then realised there was the whole  MyBoot.ShutdownPending thing which
would be the proper way to do waiting for shut-down.

 

I'm mostly read to submit for that. but one small thing was that I have been
conditionally creating the poller thread and queue and that has potential
race-condition problems.  I can definitely solve that using the poller crit
section and some atomic operations.

 

However, I'm thinking that maybe I should create the poller Task and poller
queue unconditionally in the constructor?  Any objections? It would
certainly remove the whole race condition. I had the best intentions of
making it conditional.. but now the act of creating any Vehicle class starts
the poller, it seems a bit pointless.

 

//.ichael

 

 

 

 

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