python多线程：控制线程数量

python多线程：控制线程数量   https://www.cnblogs.com/hanmk/p/12990017.html
使用线程池   https://zhuanlan.zhihu.com/p/627853937

1.自定义线程池

 1 import threading
 2 import Queue
 3 import time
 4   
 5 queue = Queue.Queue()
 6   
 7   
 8 def put_data_in_queue():
 9   for i in xrange(10):
10     queue.put(i)
11   
12   
13 class MyThread(threading.Thread):
14   def run(self):
15     while not queue.empty():
16       sleep_times = queue.get()
17       time.sleep(sleep_times)
18       queue.task_done()
19   
20   
21 def main_function():
22   threads_num = 6
23   while True:
24     put_data_in_queue()
25     for i in xrange(threads_num):
26       myThread = MyThread()
27       myThread.setDaemon(True)
28       myThread.start()
29     queue.join()
30     time.sleep(60)

2.多线程与signal信号的监控结合

import threading
import Queue
import time
import signal
  
queue = Queue.Queue()
stop = False
  
  
def receive_signal(signum, stack):
  signal.signal(signal.SIGTERM, original_sigterm)
  global stop
  stop = True
  
  
def put_data_in_queue():
  for i in xrange(10):
    queue.put(i)
  
  
class MyThread(threading.Thread):
  def run(self):
    while not queue.empty():
      sleep_times = queue.get()
      time.sleep(sleep_times)
      queue.task_done()
  
  
def main_function():
  threads_num = 6
  while not stop:
    put_data_in_queue()
    for i in xrange(threads_num):
      myThread = MyThread()
      myThread.setDaemon(True)
      myThread.start()
    queue.join()
    time.sleep(60)
  
  
if __name__ == "__main__":
  original_sigterm = signal.getsignal(signal.SIGTERM)
  signal.signal(signal.SIGTERM, receive_signal)
  main_function()