python 开发的三种运行模式详细介绍

#!/usr/bin/python
import os
import sys
import re
import signal
import time

g_exit = 0

def sig_process(sig, frame):
  global g_exit
  g_exit = 1
  print 'catch signal'

def main():
  global g_exit
  signal.signal(signal.SIGINT, sig_process)
  while 0 == g_exit:
    time.sleep(1)

    '''
    module process code
    ''' 

if __name__ == '__main__':
  main()

#!/usr/bin/python
import os
import sys
import re
import signal
import time
import threading

g_exit=0

def run_thread():
  global g_exit
  while 0 == g_exit:
    time.sleep(1)

    '''
    do jobs per thread
    '''

def sig_process(sig, frame):
  global g_exit
  g_exit = 1

def main():

  global g_exit

  signal.signal(signal.SIGINT, sig_process)
  g_threads = []
  for i in range(4):
    td = threading.Thread(target = run_thread)
    td.start()
    g_threads.append(td)

  while 0 == g_exit:
    time.sleep(1)

  for i in range(4):
    g_threads[i].join()


if __name__ == '__main__':
  main()

#!/usr/bin/python

import os
import sys
import re
import time
import signal
import threading

g_num = 4
g_exit =0
g_threads = []
g_sem = []
g_lock = threading.Lock()
g_event = {}

def add_event(name, data):
  global g_lock
  global g_event

  if '' == name:
    return

  g_lock.acquire()
  if name in g_event:
    g_event[name].append(data)
    g_lock.release()
    return

  g_event[name] = []

  '''
  0 means idle, 1 means busy
  '''
  g_event[name].append(0)
  g_event[name].append(data)
  g_lock.release()

def get_event(name):
  global g_lock
  global g_event

  g_lock.acquire()
  if '' != name:
    if [] != g_event[name]:
      if 1 != len(g_event[name]):
        data = g_event[name][1]
        del g_event[name][1]
        g_lock.release()
        return name, data
      else:
        g_event[name][0] = 0

  for k in g_event:
    if 1 == len(g_event[k]):
      continue

    if 1 == g_event[k][0]:
      continue

    g_event[k][0] =1
    data = g_event[k][1]
    del g_event[k][1]
    g_lock.release()
    return k, data

  g_lock.release()
  return '', -1

def sig_process(sig, frame):
  global g_exit
  g_exit =1
  print 'catch signal'

def run_thread(num):
  global g_exit
  global g_sem
  global g_lock

  name = ''
  data = -1

  while 0 == g_exit:
    g_sem[num].acquire()

    while True: 
      name, data = get_event(name)
      if '' == name:
        break

      g_lock.acquire()
      print name, data
      g_lock.release()


def test_thread():
  global g_exit

  while 0 == g_exit:
    for i in range(100):
      add_event('1', (i << 2) + 0)
      add_event('2', (i << 2) + 1)
      add_event('3', (i << 2) + 2)
      add_event('4', (i << 2) + 3)

    time.sleep(1)


def main():
  global g_exit
  global g_num
  global g_threads
  global g_sem

  signal.signal(signal.SIGINT, sig_process)
  for i in range(g_num):
    sem = threading.Semaphore(0)
    g_sem.append(sem)
    td = threading.Thread(target=run_thread, args=(i,))
    td.start()
    g_threads.append(td)

  '''
  test thread to give data
  '''
  test = threading.Thread(target=test_thread)
  test.start()

  while 0 == g_exit:
    for i in range(g_num):
      g_sem[i].release()
    time.sleep(1)

  '''
  call all thread to close
  '''
  for i in range(g_num):
    g_sem[i].release()

  for i in range(g_num):
    g_threads[i].join()

  test.join()
  print 'exit now'

'''
entry
'''
if __name__ == '__main__':
  main()