Threading ping in mininet

Question

I want to launch two or many hosts simultaneously for pinging two others hosts with python in mininet, i do that and doesn't work

def simpleTest(h1,h2): 

    print (h1.cmd('ping -c5 %s' h2.IP()))

and main :

if __name__ == '__main__':
    net = Mininet(...)
    threads= 3 # three threads
    #....codes...... 
    for i in range(1, threads):
        hostsrc=net.hosts[i]
        hostdest=net.hosts[i+4]
        thread = threading.Thread(target=simpleTest(hostsrc,hostdest))
        jobs.append(thread)

    for j in jobs:
        j.start()
    for j in jobs:
        j.join()
    """
    codes ...
    """

Any solution for that please ...

In concrete terms, what does that mean in your program. Does that mean there's an error? — AMC, Dec 19 '19 at 01:22

score 1 · Accepted Answer · answered Dec 19 '19 at 01:19

1

It worked by adding args in this line ...

        thread = threading.Thread(target=simpleTest, args=(hostsrc,hostdest,))

answered Dec 19 '19 at 01:19

Maher Bassi

31
4

JeanExtreme002 · Answer 2 · 2019-12-19T01:31:41.677

The problem is that when you pass the simpleTest function as an argument, you are calling it. You should write the code like this:

thread = threading.Thread(target = simpleTest, args = (hostsrc, hostdest,))

Or using lambda:

thread = threading.Thread(target = lambda:simpleTest(hostsrc, hostdest))

The code you wrote passed the value None to the target parameter, since the simpleTest function returns no value, so nothing happened when calling the start method.

Threading ping in mininet

2 Answers2