python实现多线程的方式及多条命令并发执行

            
#!/usr/bin/python
# encoding=utf-8
# Filename: thread-extends-class.py
# 直接从Thread继承，创建一个新的class，把线程执行的代码放到这个新的 class里
import threading
import time
 
class ThreadImpl(threading.Thread):
 def __init__(self, num):
  threading.Thread.__init__(self)
  self._num = num
 
 def run(self):
  global total, mutex
  
  # 打印线程名
  print threading.currentThread().getName()
 
  for x in xrange(0, int(self._num)):
   # 取得锁
   mutex.acquire()
   total = total + 1
   # 释放锁
   mutex.release()
 
if __name__ == '__main__':
 #定义全局变量
 global total, mutex
 total = 0
 # 创建锁
 mutex = threading.Lock()
 
 #定义线程池
 threads = []
 # 创建线程对象
 for x in xrange(0, 40):
  threads.append(ThreadImpl(100))
 # 启动线程
 for t in threads:
  t.start()
 # 等待子线程结束
 for t in threads:
  t.join() 
 
 # 打印执行结果
 print total
          

            
#!/usr/bin/python
# encoding=utf-8
# Filename: thread-function.py
# 创建线程要执行的函数，把这个函数传递进Thread对象里，让它来执行

import threading
import time
 
def threadFunc(num):
 global total, mutex
 
 # 打印线程名
 print threading.currentThread().getName()
 
 for x in xrange(0, int(num)):
  # 取得锁
  mutex.acquire()
  total = total + 1
  # 释放锁
  mutex.release()
 
def main(num):
 #定义全局变量
 global total, mutex
 total = 0
 # 创建锁
 mutex = threading.Lock()
 
 #定义线程池
 threads = []
 # 先创建线程对象
 for x in xrange(0, num):
  threads.append(threading.Thread(target=threadFunc, args=(100,)))
 # 启动所有线程
 for t in threads:
  t.start()
 # 主线程中等待所有子线程退出
 for t in threads:
  t.join() 
  
 # 打印执行结果
 print total
 
 
if __name__ == '__main__':
 # 创建40个线程
 main(40)

          

            
#!/usr/bin/python
# encoding=utf-8
# Filename: put_files_hdfs.py
# 让多条命令并发执行,如让多条scp,ftp,hdfs上传命令并发执行,提高程序运行效率
import datetime
import os
import threading

def execCmd(cmd):
 try:
  print "命令%s开始运行%s" % (cmd,datetime.datetime.now())
  os.system(cmd)
  print "命令%s结束运行%s" % (cmd,datetime.datetime.now())
 except Exception, e:
  print '%s\t 运行失败,失败原因\r\n%s' % (cmd,e)

if __name__ == '__main__':
 # 需要执行的命令列表
 cmds = ['ls /root',
    'pwd',]
 
 #线程池
 threads = []
 
 print "程序开始运行%s" % datetime.datetime.now()

 for cmd in cmds:
  th = threading.Thread(target=execCmd, args=(cmd,))
  th.start()
  threads.append(th)
   
 # 等待线程运行完毕
 for th in threads:
  th.join()
   
 print "程序结束运行%s" % datetime.datetime.now()