[x265] FR: Postpone Windows 10 update reboots during encodes by signaling "busy"?

[Mario *LigH* Rohkrämer]

Request by 'Stereodude' in the doom9 forum:

https://forum.doom9.org/showthread.php?p=1844407#post1844407

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Is there any way to x265 to let Windows know that it's busy encoding to 
prevent a Windows update from rebooting the PC during an encode? I 
thought I read before that there's a way for an application to let the 
OS know it's "busy" so that it won't reboot while the application is 
crunching away.

Currently Windows 10 will happily reboot mid x264 or x265 encode even if 
the CPU is pegged at 100%.
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I wonder if you could use the ShutdownBlockReasonCreate function to 
postpone it:

https://msdn.microsoft.com/en-us/library/windows/desktop/aa376877%28v=vs.85%29.aspx

And which window handle would you use for a CLI application?