The asyncio module comes with coroutine support. Investigating the topic on the net reveals that FSM's are for old people and the brave new world uses coroutines. Unfortunately, all examples I could find seem to be overly simplistic, and I'm left thinking coroutines have few practical uses in network programming.
PEP-380 refers to the classic Dining Philosophers: <URL: http://www.cos c.canterbury.ac.nz/greg.ewing/python/yield-from/yf_current/Examples/Sch eduler/philosophers.py> (reproduced below). Suppose I want to fix the protocol by supplying an "attendant" object that periodically tells the philosophers to drop whatever they are doing and start thinking. So I would add: schedule(attendant(..., [ plato, socrates, euclid ])) but how would I modify the philosopher code to support such master resets? Marko ======================================================================== from scheduler import * class Utensil: def __init__(self, id): self.id = id self.available = True self.queue = [] def acquire(self): #print "--- acquire", self.id, "avail", self.available if not self.available: block(self.queue) yield #print "--- acquired", self.id self.available = False def release(self): #print "--- release", self.id self.available = True unblock(self.queue) def philosopher(name, lifetime, think_time, eat_time, left_fork, right_fork): for i in range(lifetime): for j in range(think_time): print(name, "thinking") yield print(name, "waiting for fork", left_fork.id) yield from left_fork.acquire() print(name, "acquired fork", left_fork.id) print(name, "waiting for fork", right_fork.id) yield from right_fork.acquire() print(name, "acquired fork", right_fork.id) for j in range(eat_time): # They're Python philosophers, so they eat spam rather than spaghetti print(name, "eating spam") yield print(name, "releasing forks", left_fork.id, "and", right_fork.id) left_fork.release() right_fork.release() print(name, "leaving the table") forks = [Utensil(i) for i in range(3)] schedule(philosopher("Plato", 7, 2, 3, forks[0], forks[1]), "Plato") schedule(philosopher("Socrates", 8, 3, 1, forks[1], forks[2]), "Socrates") schedule(philosopher("Euclid", 5, 1, 4, forks[2], forks[0]), "Euclid") run() -- https://mail.python.org/mailman/listinfo/python-list
