[Mono-dev] mod_mono restart patch

[Joshua Tauberer]

I encountered a problem when doing a mod-mono-server restart through the 
mod_mono control panel that when requests came in while the restart was 
in progress, the restart would fail, mod-mono-server would be forked but 
fail to start, and it would be continually forked at each request but 
still fail to start.

My solution was to disallow requests while a restart is in progress.

The attached patch allows mod-mono-server backends to be 'paused' with 
requests coming in dropped with 503s during that time. The control panel 
restart now pauses and resumes around the restart. You can also 
pause/resume from the control panel.

The patch also changes where locking is done for the active requests 
counter. (This should have no consequences.)

Attached. I'll commit if it's ok.

-- 
- Josh Tauberer

http://razor.occams.info

"Yields falsehood when preceded by its quotation!  Yields
falsehood when preceded by its quotation!" Achilles to
Tortoise (in "Godel, Escher, Bach" by Douglas Hofstadter)
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