多进程共享数据：数字变量、字符串变量、列表变量、字典变量、实例对象

from multiprocessing import Process,Manager,Value
from ctypes import c_char_p

def f(shareDict,shareList,i,s):
    shareDict[1]='1'
    shareDict[2]=2
    shareDict[0.25]=None
    shareList.reverse()
    i.value+=1
    s.value=s.value+' ,over!'

if __name__ == "__main__":
    i=Value('i',0)  # 共享数字变量
    m=Manager()
    shareDict=m.dict()  # 共享字典变量
    shareList=m.list(range(5))  # 共享列表变量
    s=m.Value(c_char_p,'hello')  # 共享字符串变量
    p=Process(target=f,args=(shareDict,shareList,i,s))
    p.start()
    p.join()
    print(shareList)
    print(shareDict)
    print(i.value)
    print(s.value)

# 共享实例对象
from multiprocessing import Process,Value,Lock

class Counter(object):
    def __init__(self,initval=0):
        self.val=Value('i',initval)
        self.lock=Lock()

    def increate(self):
        with self.lock:
            self.val.value+=1

    def value(self):
        return self.val.value

def func(counter):
    for i in range(5):
        counter.increate()

if __name__ =="__main__":
    c=Counter(0)  #实例对象
    procs=[Process(target=func,args=(c,)) for i in range(3)]
    for p in procs:p.start()
    for p in procs:p.join()
    print(c.value())