##I have tried to fix my par function like this:
##-----------------
def par(*funcs):
    taskEnd = stackless.channel()
    def signalEnd(f):
        f()
        taskEnd.send(1)


    for f in funcs:
        stackless.tasklet(signalEnd)(f)

    stackless.schedule()
    
    count = len(funcs)
    while count > 0:
        taskEnd.receive()
        count -= 1
##-----------------
##But it still crashes if one of the funcs raises an exception.
##
##I have found one way to fix it - create the taskEnd channel outside the
##function (as a global). Then it works fine, but of course the semantics
##are messed up if there is more than one par in a program.
##
def f():
    1/0

par(f)