Threading - to Ping a complete class C subnet
Threads - What why and how example from a Well House Consultants training course
More on Threads - What why and how [link]
Source code: fastandfull Module: Y302
from threading import Thread
"""Threading demo to test out all 254 possible hosts on a
class C network via ping, with up to 15 running at a time.
As threads complete, they're reaped and others started"""
# Differs from our other examples - this one harvests
# completed threads quickly (and out of order) to give
# faster performance on a network with a significant
# number of live systems
def __init__ (self,ip):
self.ip = ip
self.status = -1
pingaling = os.popen("ping -q -c2 "+self.ip,"r")
line = pingaling.readline()
if not line: break
igot = re.findall(testit.lifeline,line)
self.status = int(igot)
testit.lifeline = re.compile(r"(\d) received")
report = ("No response","Partial Response","Alive")
MAX_PARALLEL = 15
pinglist = 
top = 254
for host in range(1,top+1):
ip = "192.168.200."+str(host)
current = testit(ip)
# Can we keep creating threads?
# Or are we maxed out or done with creation?
waitfor = 0
if len(pinglist) > MAX_PARALLEL: waitfor = 1
if host == top: waitfor = len(pinglist)
# Can we reap any pings that have responded quickly?
if waitfor == 1:
posn = 0
while posn < len(pinglist):
also = pinglist[posn]
if also.status > -1:
print "Status from ",also.ip,"is",report[also.status]
waitfor -= 1
posn += 1
# Reap any threads necessary
for reap in range(waitfor):
pingle = pinglist
pinglist = pinglist[1:]
print "Waiting for ",pingle.ip
print "Status from ",pingle.ip,"is",report[pingle.status]
""" This program runs individual and parallel pings.
Since ping is implemented differently on different
versions of Linux and Unix, you may need to change
your ping options and the regular expression that it
matches to get the correct results """
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