Can someone explain why the following example (lifted straight out of http://twistedmatrix.com/documents/current/howto/threading) doesn't work?

from twisted.internet import threads

def doLongCalculation(): #time.sleep(3) return 3

def printResult(x): print "deferred returned "+str(x)

d = threads.deferToThread(doLongCalculation) d.addCallback(printResult) print "just waiting for deferred..."

Running the above, with or without time.sleep(), results in a hanging process. When run "just waiting for deferred..." prints but the callback is never invoked and the process hangs.

I'm using twisted 1.3, python 2.3.4 under Linux (FC3).

Lenny G

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