# CS 450; Python Thread list example
# version 2014-01-31 8:37 PM
#
# Create a list of threads, start them all, then join them all
#
from threading import Thread
import time	# for sleep
import random

# say_hello prints its id and sleeps for a given nbr of seconds
#
def say_hello(id, seconds):
	print('Child {} is running'.format(id))
	time.sleep(seconds)
	print('Child {} is done'.format(id))

# main(nbr_thds) creates a number of threads (default of 5)
# then it starts all the threads, and then it waits until they all finish.
# Each thread sleeps for a random number of seconds >= 1 and <= 9),
#
def main(nbr_thds = 5):
	# ts is a list of thread objects
	ts = [Thread(target=say_hello, args=([i, random.randint(1,9)]))
		for i in range(nbr_thds)]

	for t in ts:
		t.start()
		print('Started thread {}'.format(t.ident)) # note: ident field

	for t in ts:
		t.join()
		print('Joined thread {}'.format(t.ident))

main()