Matt Holt 5e0896305c SIGUSR2 triggers graceful binary upgrades (spawns new process) (#1814) ...

* SIGUSR2 triggers graceful binary upgrades (spawns new process)

* Move some functions around, hopefully fixing Windows build

* Clean up a couple file closes and add links to useful debugging thread

* Use two underscores in upgrade env var

To help ensure uniqueness / avoid possible collisions

2017-08-12 11:04:32 -06:00

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