python 多进程和多线程

多进程和多线程

#!/usr/bin/python# -*- coding:utf-8 -*-import osimport threadingimport multiprocessingimport time#Process entrydef process_worker(sign,lock,function):    global count_process    #lock.acquire()    count_process += 1    print(sign, os.getpid())    print apply(function)    #lock.release()#Thread entrydef thread_worker(sign, lock,function):    global count_thread    lock.acquire()    count_thread += 1    print(sign, os.getpid())    print apply(function)    lock.release()    #real work functions   def Lee():    return 'I am Lee'def Marlon():    return 'I am Marlon'def Allen():    return 'I am Allen'    count_thread = 0count_process = 0if __name__=='__main__':    # Multi-process begin    multiprocessing.freeze_support() #window python 中需要,否则会出现随意打开很多进程的情况    print('Main:',os.getpid())    record = []    lock = multiprocessing.Lock()    func_list = [Lee,Marlon,Allen]    for function in func_list:                process = multiprocessing.Process(target=process_worker,args=('Process',lock,function))        process.start()        record.append(process)    for process in record:        process.join()       print "count_process value is", count_process #该值没有改变，多进程不共享内存        # Multi-thread begin    record = []    lock  = threading.Lock()    for function in func_list:          thread = threading.Thread(target=thread_worker,args=('thread',lock,function))        thread.start()        record.append(thread)    for thread in record:        thread.join()      print "count_thread value is", count_thread #该值改变，所以多线程共享内存