I'm trying to understand basic threading in python, I'm having trouble understanding how pooling works with the queue module. Heres the example server used in the howto I'm reading from: http://www.devshed.com/c/a/Python/Basic-Threading-in-Python/2/. Basically what I don't understand is how the variable pickledList ends up available to the threads scope to be shipped out to the client since its never passed to the thread anywhere in the code
import pickle
import Queue
import socket
import threading
# We'll pickle a list of numbers, yet again:
someList = [ 1, 2, 7, 9, 0 ]
pickledList = pickle.dumps ( someList )
# A revised version of our thread class:
class ClientThread ( threading.Thread ):
# Note that we do not override Thread's __init__ method.
# The Queue module makes this not necessary.
def run ( self ):
# Have our thread serve "forever":
while True:
# Get a client out of the queue
client = clientPool.get()
# Check if we actually have an actual client in the client variable:
if client != None:
print 'Received connection:', client [ 1 ] [ 0 ]
client [ 0 ].send ( pickledList )
for x in xrange ( 10 ):
print client [ 0 ].recv ( 1024 )
client [ 0 ].close()
print 'Closed connection:', client [ 1 ] [ 0 ]
# Create our Queue:
clientPool = Queue.Queue ( 0 )
# Start two threads:
for x in xrange ( 2 ):
ClientThread().start()
# Set up the server:
server = socket.socket ( socket.AF_INET, socket.SOCK_STREAM )
server.bind ( ( '', 2727 ) )
server.listen ( 5 )
# Have the server serve "forever":
while True:
clientPool.put ( server.accept() )