Re: Thread Question

Em Ter, 2006-02-28 às 20:24 +0000, Grant Edwards escreveu:
I have seen examples that used classes, and other examples
that just called one thread start command - when should you
use one over another?

I'm not sure what you mean by "use classes" vs. "calling a
thread start command". My example above uses a class
(threading.Thread) to create a thread object, and then calls
its start method.

# He meant calling direct vs. subclassing. In your example you called
the Thread class directly, but you could have subclassed it.

# In your case, Edwards, I'd prefer subclassing because then you could
put some states in the class. A (bad) example:

class Foo(Thread):
def __init__(self):
Thread.__init__(self)
self.alive = False
self.running = True

def run(self):
while self.running:
self.alive = ping('myhost')
sleep(10)

def stop(self):
self.running = False

# Then you could:

a = Foo()
do_something()
print a.alive
do_something_more()
print a.alive
finish_everything()
print a.alive
a.stop()
# quit

--
"Quem excele em empregar a força militar subjulga os exércitos dos
outros povos sem travar batalha, toma cidades fortificadas dos outros
povos sem as atacar e destrói os estados dos outros povos sem lutas
prolongadas. Deve lutar sob o Céu com o propósito primordial da
'preservação'. Desse modo suas armas não se embotarão, e os ganhos
poderão ser preservados. Essa é a estratégia para planejar ofensivas."

-- Sun Tzu, em "A arte da guerra"

.

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