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  • Committer: Bazaar Package Importer
  • Author(s): Alexandre Fayolle
  • Date: 2007-04-13 09:33:09 UTC
  • Revision ID: james.westby@ubuntu.com-20070413093309-yoojh4jcoocu2krz
Tags: upstream-1.0.0
Import upstream version 1.0.0

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demo/uthread.py
 
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"""This is an example that uses the (prototype) Logic Object Space. To run,
 
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you have to set USE_GREENLETS in pypy.objspace.logic to True and do:
 
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    $ py.py -o logic uthread.py
 
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newvar creates a new unbound logical variable. If you try to access an unbound
 
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variable, the current uthread is blocked, until the variable is bound.
 
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"""
 
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X = newvar()
 
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Y = newvar()
 
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bind(Y, X) # aliasing
 
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def f():
 
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    print "starting"
 
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    print is_free(X)
 
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    if Y:
 
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        print "ok"
 
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        return
 
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    print "false"
 
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    return
 
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def bind():
 
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    unify(X, 1)
 
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uthread(f)
 
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print "afterwards"
 
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uthread(bind)