I am running the following Python program to start a few processes to run simultaneously. Each process will run for several seconds. This is being started from a command prompt. But if I interrupt the execution (ctl-C) I often get a console message 'keyboard interrupt' along with a long traceback and the command prompt is forever lost. I must kill the command prompt and start a new one. Depending upon timing, sometimes it will allow new commands to be enterred, but there is no input prompt C\xxx\xxx>. I expected the ctl-C just to terminate the mainline being executed which would in turn kill the child processes that were running. But this was not the case. Why can't this program be interrupted without bringing down the Command Prompt from running again? from multiprocessing import Process, Pool import os import time def proc(name): print('\nStarting process name:',name, 'PID: ', os.getpid()) for i in range(1,5): print (os.getpid(),': ',i,'\n') time.sleep(1) if __name__ == '__main__': print ('\nMain process ID:', os.getpid(), '\n') numServers = 3 serverNum = [] for i in range(numServers): serverNum.append(i+1) print ('serverNum: ', serverNum) with Pool(numServers) as p: p.map(proc, serverNum) # --> hang here until the processes complete # Execution stops when all processes complete print ('Ending mainline task', os.getpid()) exit(0) The program output is: Main process ID: 40536 serverNum: [1, 2, 3] Starting process name: 1 PID: 34508 34508 : 1 Starting process name: 2 PID: 2200 2200 : 1 Starting process name: 3 PID: 43476 43476 : 1 34508 : 2 2200 : 2 43476 : 2 34508 : 3 2200 : 3 43476 : 3 34508 : 4 2200 : 4 43476 : 4 Ending mainline task 40536 Continue reading...
