进程锁和共享池

Posted 2020-10-16

一、进程锁
      

from multiprocessing import Process,Lock

def lock_f(l,i):
    l.acquire()
    try:
        print ("multip - %s" % i )
    finally:
        l.release()

if __name__=="__main__":
    lock = Lock()
    for num in range(10):
        Process(target=lock_f,args = (lock,num)).start()
二、进程池

from multiprocessing import Process,Pool,freeze_support
import time
import os

def Foo(i):
    time.sleep(1)
    print("in process!",os.getpid())
    return i+100

def Bar(args):
    print ("-->exec done!",args,os.getpid())

if __name__=="__main__":
    pool = Pool(processes=2) #允许进程池同时放入2个进程;
    print("主进程池：",os.getpid())
    for i in range(10):
        #pool.apply(func = Foo,args=(i,))#apply支持串行；
        #pool.apply_async(func=Foo,args=(i,)) #apply_async支持并行;
        pool.apply_async(func=Foo,args=(i,),callback=Bar)

    print ("end!")
    pool.close()
    pool.join()#进程池中进程，执行完毕后，再关闭；如果注视掉该行，那么程序直接关闭.