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worker_monitor.py
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worker_monitor.py
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from multiprocessing import Process
from signal import *
import time
import os
import sys
import subprocess
import VMWorker
# Create a worker monitor that keeps x worker processes running.
process_list = []
keep_going = True
def start_monitor():
global process_list
global keep_going
while keep_going:
# Clear out dead processes.
for process in process_list:
if not process.is_alive():
process_list.remove(process)
# Create new processes until max number is reached.
while len(process_list) < 3:
worker_obj = VMWorker.VMWorker()
new_process = Process(target=worker_obj.start_worker, args=(), name="Worker{0}".format(len(process_list)))
new_process.start()
process_list.append(new_process)
# Sleep for a while.
time.sleep(1)
#sys.stderr.write("Terminating all subprocesses.")
#pro = subprocess.Popen(cmd, stdout=subprocess.PIPE, shell=True, preexec_fn=os.setsid)
#os.killpg(pro.pid, signal.SIGTERM)
#for proc in process_list:
#sys.stderr.write("Terminating process {0}\r\n".format(proc.pid))
#proc.terminate()
def signal_handler(signal_type, frame):
global keep_going
keep_going = False
if __name__ == "__main__":
# This module is started up as a process either manually or by Supervisor.
for sig in (SIGABRT, SIGILL, SIGINT, SIGSEGV, SIGTERM):
signal(SIGTERM, signal_handler)
start_monitor()