マルチプロセス同期

from multiprocessing import Process
import os
import time
def func(name):
    print('Run child process %s (%s)...' % (name, os.getpid()))
    time.sleep(3)    
if __name__=='__main__':
    print('Parent process %s.' % os.getpid())
    process_list = []
    for i in range(8):
        p = Process(target=func, args=('process_%d'%(i),))
        process_list.append(p)
        
    print('Child process will start.')
    for p in process_list:
        p.start()
    finished = False
            
    while not (sum([p.is_alive() for p in process_list]) == 0):
        time.sleep(0.1)
        print('main process')
        continue
    #for p in process_list:
    #    p.join()
    print('Child process end.')