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POUsing the python multiprocessing module for IO with pygame on Mac OS 10.7
 

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  1. POUsing the python multiprocessing module for IO with pygame on Mac OS 10.7
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    <p>I use pygame for running experiments in cognitive science, and often I have heavy I/O demands so I like to fork off these tasks to separate processes (when using a multi-core machine) to improve performance of my code. However, I encountered a scenario where some code works on my colleague's linux machine (Ubuntu LTS), but not on my mac. Below is code representing a minimal reproducible example. My mac is a 2011 Macbook Air running 10.7.2 and using the default python 2.7.1. I tried both pygame as installed via <a href="http://www.pygame.org/ftp/pygame-1.9.2pre-py2.7-macosx10.7.mpkg.zip">pre-built binary</a>, and I also then tried after installing both SDL and pygame from source.</p> <pre><code>import pygame import multiprocessing pygame.init() def f(): while True: pygame.event.pump() #if this is replaced by pass, this code works p = multiprocessing.Process(target=f) p.start() while True: pass </code></pre> <p>As noted in the code, it seems that the culprit is putting <code>pygame.event.pump()</code> in a separate process. When I run this on my mac, I first get the following printed repeatedly in terminal:</p> <pre><code>The process has forked and you cannot use this CoreFoundation functionality safely. You MUST exec(). Break on __THE_PROCESS_HAS_FORKED_AND_YOU_CANNOT_USE_THIS_COREFOUNDATION_FUNCTIONALITY___YOU_MUST_EXEC__() to debug. </code></pre> <p>Then I get a crash report as copied to <a href="https://gist.github.com/1360815">this gist</a>.</p> <p>Any suggestions for how to fix this?</p>
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    1. COWow, you have a minimal example and a clear, concise described phenomenon that sounds a lot like a bug. Why not [report it](https://bitbucket.org/pygame/pygame/issues)? Seems like you'd have better luck there than SO.
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    2. COGood idea; submitted.
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      1. USMike Lawrence
 

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