I have an app that establishes multiple TCP connections. If the user
quits the app, I'd like to shut all those connections gracefully
(i.e., conduct a bit of protocol) rather than just close them
abruptly. To most properly handle this, I should even wait for the
servers' responses. I am currently initiating the graceful shutdown
in applicationWillTerminate but... how should I best wait for the
connections to close: spin in a loop and check them? and set a timer
for a timeout? Or, is there another way to more properly handle
asynchronous activity at application termination?
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