from __future__ import generators from time import time threads=[] def sleep(n): print "In Sleep" t=time() while (t+n>time()): yield None def cutscene(): yield None #start on second pass print "\nEvil Death Knight: I will kill you now!" sleep(1.5) #t=time() #while (t+1.5>time()): yield None print "\nOur Hero: I shall fight you to the death. Bring it on!" sleep(2.5) #t=time() #while (t+2.5>time()): yield None print "\nEnd of cutscene." def ticker(): yield None #wait till second time through print "." t=time() while 1: while (t+1>time()): yield None t=time() print "." def scheduler(): global threads try: while 1: for thread in threads: thread.next() except StopIteration: pass if __name__=="__main__": threads.append(ticker()) threads.append(cutscene()) scheduler() ticker() prints out a period every second. cutscene() is a scripted game sequence. sleep(n) should cause a delay of n seconds (but doesn't block execution of the other microthreads (correct term?)). ticker() and cutscene() should be running simultaneously (in effect, at least). However, when run, the sleep function doesn't execute. It doesn't even print "In Sleep". It never gets called, even though I say sleep(1.5) in cutscene(). Run it for yourself if you don't believe me. Through my testing, any generator function will not execute if called from another generator function. Regular functions work fine. If I comment the sleep statements and uncomment the while loops, it runs as expected. Why doesn't the sleep() function execute? Thanks in advance. Dustin [edited by - thedustbustr on July 25, 2003 9:59:36 PM]

So there is no way, save using stackless microthreads, to have a sleep function that ''just works''?

def xsleep(n):
t=time()
while (t+n>time()):
yield None

def sleep(n):
for i in xsleep(n): pass


This blocks execution, as if I had called time.sleep(). Why? Shouldn''t xsleep() yield to the scheduler to allow my other stuff to run?