python 筆記 之 子線程的操做

'''
子線程的操做
multiprocessing多線程Process
'''
import multiprocessing
import time


def worker(args,interval):
    print("start worker {0}".format(args))
    time.sleep(interval)
    print("end worker {0}".format(args))

'''
p表明一個多進程
p.is_alive() #判斷進程是否存活
p.run()      #啓動進程
p.start()    #會自動調用run方法，推薦使用
p.join(timeout) #等待子進程結束或到超時時間
p.terminate() #強制子進程退出
p.name       #進程名字
p.pid        #進程pid

multiprocessing
cpu_count()       #統計cpu總數
active_children() #得到全部子進程
'''

def main():
    print("start main")
    # 單個元祖的元素表示(1,)
    p1 = multiprocessing.Process(target=worker, args=(1, 1))
    p2 = multiprocessing.Process(target=worker, args=(2, 2))
    p3 = multiprocessing.Process(target=worker, args=(3, 3))
    p1.start()
    p1.join(timeout=0.5)
    p2.start()
    p3.start()
    print("the number of  cup is:  {0}".format(multiprocessing.cpu_count()))
    for p in multiprocessing.active_children():
        print("The name of active children is : {0},pid is : {1} is alived ".format(p.name,p.pid))
    print("end main")


if __name__ == '__main__':
    main()