## version 1.1, changed according to the suggestions in the comments
from twisted.internet import reactor, defer
from twisted.python import threadable; threadable.init(1)
import sys, time
## the wrong way
def callInThread(func, *args):
"""Takes a blocking function an converts it into a deferred-valued
function running in a separate thread.
"""
de = defer.Deferred()
de.addCallback(func)
reactor.callInThread(de.callback, *args)
return de
deferred = callInThread.__get__ # decorator associated to callInThread
# the right way
from twisted.internet.threads import deferToThread
deferred = deferToThread.__get__
## example code
def print_(result):
print result
def running():
"Prints a few dots on stdout while the reactor is running."
sys.stdout.write("."); sys.stdout.flush()
reactor.callLater(.1, running)
@deferred
def sleep(sec):
"A blocking function magically converted in a non-blocking one."
print 'start sleep %s' % sec
time.sleep(sec)
print '\nend sleep %s' % sec
return "ok"
if __name__ == "__main__":
sleep(2).addBoth(print_)
reactor.callLater(.1, running)
reactor.callLater(3, reactor.stop)
reactor.run()
