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    <p>I would personally suggest writing this without using the <code>multiprocessing</code> module: it uses <code>fork()</code> which has unspecified effects with most complex libraries, like in this case <code>pygame</code>.</p> <p>You should try to write this as two completely separate programs. It forces you to think about what data needs to go from one to the other, which is both a bad and a good thing (as it may clarify things). You can use some inter-process communication facility, like the stdin/stdout pipe; e.g. in one program (the "main" one) you start the other as a sub-process like this:</p> <pre><code>popen = subprocess.Popen([sys.executable, '-u', 'my_subproc.py'], stdin=subprocess.PIPE, stdout=subprocess.PIPE) </code></pre> <p>(The <code>-u</code> is for unbuffered.)</p> <p>Then read/write the data to popen.stdin/popen.stdout in the parent process, and to sys.stdin/sys.stdout in the subprocess. The simplest example would be if the two processes only need a synchronization signal, e.g. the parent process waits in a loop for the subprocess to say "next please". To do this the subprocess does <code>print 'next please'</code>, and the parent process does <code>popen.stdin.readline()</code>. (The print goes to sys.stdin in the subprocess.)</p> <p>Unrelated small note:</p> <pre><code>keypress = ['K_p', ...] ... cmd = compile('cond = keys['+i+']', '&lt;string&gt;', 'exec') exec cmd if cond: </code></pre> <p>This looks like very heavy code to just do:</p> <pre><code>keypress = [K_p, ...] # not strings, directly the values ... if keys[i]: </code></pre>
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    1. POConcurrent functions running in separate process using pygame and multiprocessing
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    1. USArmin Rigo
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      1. VTUpMod
    1. COIf one of the processes would import pygame after forking this should be fine...
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      1. USllukas
 

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