解决Python设置函数调用超时,进程卡住的问题

import time
import signal
 
 
def test(i):
 time.sleep(i % 4)
 print "%d within time" % (i)
 return i
 
 
if __name__ == '__main__':
 def handler(signum, frame):
 raise AssertionError
 
 
for i in range(1, 10):
 try:
  signal.signal(signal.SIGALRM, handler)
  signal.alarm(3)
  test(i)
 except AssertionError:
  print "%d timeout" % (i)
 finally:
  signal.alarm(0)
  signal.signal(signal.SIGALRM, signal.SIG_DFL)