On 24/12/06, Luke Paireepinart <[EMAIL PROTECTED]> wrote:
Kent Johnson wrote:
> Jonathan McManus wrote:
>
>> Hi all,
>>
>> Just a quick question, really. Is there any good way to have an
infinite
>> loop in a program, without said infinite loop eating up the CPU? I've
>> tried the trick of adding a pause (time.sleep(0.01)) somewhere in the
>> loop, and this appears to have worked on a basic infinite loop, but
this
>> doesn't appear to work for two separate infinite loops (in threads).
>>
>
> You would have to put a sleep in each thread.
>
> Why are you using infinite loops? Are you implementing some kind of
> polling loop? Often there are better alternatives, either an event
> notification or some kind of lock. If you post some details of why you
> want to do this we may be able to help you find a better way.
>
> Kent
>
> _______________________________________________
> Tutor maillist - Tutor@python.org
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>
>
Kent et. al.,
I'm writing something that has to do with sockets.
I need to recv any incoming packets from the socket.
I will have potentially hundreds of separate sockets open in a single
application.
I was just going to create a thread for each, so I could receive from
them separately.
Alternately, I figured I could read from each socket in sequence if I
could get the recv method to not block until it gets input,
so I tried this,
#code ----
self.conn.setblocking(False)
info = self.conn.recv(8000)#this should read everything.
#---- code
where conn is connected to another computer already,
and I get the following error:
(Verbatim except for line 3, changed to hide username/password)
Traceback (most recent call last):
File "C:\Python Scripts\AIM Connection Server\toc2.py", line 199, in ?
toc.login('---username---','---password---')
File "C:\Python Scripts\AIM Connection Server\toc2.py", line 116, in
login
print self.getFlap()
File "C:\Python Scripts\AIM Connection Server\toc2.py", line 93, in
getFlap
info = self.conn.recv(8000)#this should read everything.
error: (10035, 'The socket operation could not complete without blocking')
Do I misunderstand what blocking is?
It seems to me that blocking would mainly apply to inputs.
(My understanding is that 'blocking' means when you call 'recv' it will
return '' if it didn't receive anything.)
I'd appreciate any links that I could read up on, or any advice on how
to make socket inputs with event notification, as Kent mentioned earlier.
Basically, as Kent said, I have a polling loop, and I am not sure what
the alternative is to threads.
Thanks,
-Luke
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Well I've been doing some networking stuff in stackless myself recently and
I would probably do something like this:
import select
import stackless
import socket
def get_data(sock):
sock.setblocking(0)
poller = select.poll()
poller.register(sock, select.POLLIN)
while True:
if poller.poll(0):
sock.recv(1024)
stackless.schedule()
stackless.tasklet(get_data)(socket.socket(socket.AF_INET, socket.SOCK_DGRAM
))
stackless.run()
stackless thread things are really low on resources so you can run tens of
thousands without too much trouble.
HTH,
Adam.
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