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Is it a bad idea to run two instances of a Cocoa application at the same time?

Answer 1

+3 A:

As long as you don't modify the same resources (without precaution) you're fine.

You can easily start several instances of (almost ?) any Mac app, via the terminal. For example, type this several times into the shell:

/Applications/Calculator.app/Contents/MacOS/Calculator &

Everytime you press enter you'll see yet another calculator open. It's only Finder/open that only start an app once.

DarkDust 2010-10-27 11:06:12

Yep, I do check the `/tmp` and `/Applications` directories, which are the only directories I use in my application, but what about Cocoa-bindings and user preferences?

Time Machine 2010-10-27 11:15:24

I don't know about them, but my guess that the last `[[NSUserDefaults standardUserDefaults] synchronize]` wins and overwrites the others :-)

DarkDust 2010-10-27 12:07:14

The little problem I have with that is that I pass command line options using NSUserDefaults: http://unixjunkie.blogspot.com/2006/07/command-line-processing-in-cocoa.html and those may not be changed, of course. Oh, of course, I could save them in a variable. (:

Time Machine 2010-10-27 13:10:10

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Is it a bad idea to run two instances of a Cocoa application at the same time?

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