python 執行緒中join方法的使用

1、作用：讓子執行緒插入主線程，可理解為在在join呼叫處把子執行緒的code move到了主線程，直到被插入的code執行結束，主線程接著下面的繼續**執行

2、觸發條件：手動呼叫或主線程要退出時自動呼叫

3、引數說明：join方法可可傳入引數表示子執行緒加入主線程的執行時間，超出此時間，強制結束子執行緒，不傳引數表示時間不限！

4、example

a) 主線程**將要結束時自動呼叫       

from threading import thread

import threading
from time import sleep
import signal
import traceback
import sys
import os
class datagenerator(thread):
def __init__(self, topic_dir):
self.topic_dir = topic_dir
self.stopflag = false
threading.thread.__init__(self, name="thread_generator_")
def run(self):
self.stoped = false
while not self.stopflag:
print "test_data"
shell_cmd = "sh /usr/local/data_generator/do.sh " + self.topic_dir
# os.system(shell_cmd)
print "runing.....\n"
sleep(1)
self.stoped = true
def join(self, timeout=none):
self.stopflag = true
while not self.stoped:
print "waiting for stopped\n"
sleep(1)
threading.thread.join(self, timeout)
if __name__ == "__main__":
if len(sys.argv) < 2:
print "please set the topic_dirs \n"
os._exit(-1)
stop_flag = false
generators = 
for topic_dir in sys.argv[1:]:
generator = datagenerator(topic_dir)
for g in generators:
g.start()
print "start finished!\n"
# while not stop_flag:
# sleep(1)
# sleep(2)

from threading import thread

import threading
from time import sleep
import signal
import traceback
import sys
import os
class datagenerator(thread):
def __init__(self, topic_dir):
self.topic_dir = topic_dir
self.stopflag = false
threading.thread.__init__(self, name="thread_generator_")
def run(self):
self.stoped = false
while not self.stopflag:
print "test_data"
shell_cmd = "sh /usr/local/data_generator/do.sh " + self.topic_dir
# os.system(shell_cmd)
print "runing.....\n"
sleep(1)
self.stoped = true
def join(self, timeout=none):
self.stopflag = true
while not self.stoped:
print "waiting for stopped\n"
sleep(1)
threading.thread.join(self, timeout)
if __name__ == "__main__":
if len(sys.argv) < 2:
print "please set the topic_dirs \n"
os._exit(-1)
stop_flag = false
generators = 
for topic_dir in sys.argv[1:]:
generator = datagenerator(topic_dir)
def stop(n=0, e=0):
global stop_flag
for g in generators:
#logger.error("stopping " + str(t))
try:
g.join(60)
except:
print traceback.format_exc()
#logger.error(traceback.format_exc())
stop_flag = true
#ctrl+c
signal.signal(signal.sigterm, stop)
#kill
signal.signal(signal.sigint, stop)
for g in generators:
g.start()
print "start finished!\n"
while not stop_flag:
sleep(1)
# sleep(2)
print "stop finished!\n"

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