实现同时运行多个线程工作,主要通过信号量的设置,但还是在一个CPU上执行,具体要实现的例子可以放在函数里执行,实现单核多并发,还等待什么......#!/usr/bin/env python# -*- coding: utf-8 -*-import threadingimport timeimport randomdef work_func():    print "worker thread is started at %s"% threading.current_thread()    random.seed()    time.sleep(random.random())    print "worker thread is finished at %s"%threading.current_thread()def sinple_thread_demo():    for i in range(100):        t=threading.Thread(target=work_func)        t.start()def worker_func_lock(lock):    lock.acquire()    work_func()    lock.release()gLock=threading.Lock()gSem=threading._Semaphore(100)#信号量,允许同时运行的线程数def thread_demo_lock():    for i in range(100):        #sl=threading.Thread(target=worker_func_lock,args=[gLock])        sl=threading.Thread(target=worker_func_lock,args=[gSem])#参数传入信号量        sl.start()if __name__=="__main__":    #sinple_thread_demo()#通过锁实现串行    thread_demo_lock()