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The answer is that the multiprocessing module forks a completely different process with its own stdout... So your application is running just as you wrote it: <ol> <li>You start up the application in your terminal window.</li> <li>You click on the Run button in your browser which does a GET on /run</li> <li>You see the output of the current process in your terminal window, "Starting.."</li> <li>A new process is started, MyProc with its own stdout and stderr.</li> <li>MyProc prints to its stdout (which goes nowhere), 'Starting long process..'.</li> <li>The very moment MyProc starts up, your app prints to stdout, "After start." since it was not told to wait for any kind of response from MyProc before doing so.</li> </ol> What you need is to implement a Queue that communicates back and forth between your main application's process and the forked process. There's some multiprocessing-specific examples on how to do that here: <a href="http://www.ibm.com/developerworks/aix/library/au-multiprocessing/" rel="nofollow">http://www.ibm.com/developerworks/aix/library/au-multiprocessing/</a> However, that article (like most articles from IBM) is kind of deep and overly complicated... You might want to take a look at a simpler example of how to use the "regular" Queue module (it is pretty much identical to the one included in multiprocessing): <a href="http://www.artfulcode.net/articles/multi-threading-python/" rel="nofollow">http://www.artfulcode.net/articles/multi-threading-python/</a> The most important concepts to understand are how to shuffle data between processes using the Queue and how to use join() to wait for a response before proceeding.
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1. POWhy does a background task block the response in SimpleHTTPServer?
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1. USDan McDougall
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1. COMy problem is not with communication to the multiprocess, my problem is with not getting the message "Process started" in the browser until I _quit_ the multiprocess. I should get this message immediately, since "After start" is clearly printed, but instead there is no HTTP response until the other process finishes, even though I am not waiting for it.
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