python - 如何在循环中使用 os.fork() 调用不同的函数？

Question

我尝试使用以下代码

import os


def sum1(a):
    print "We are in the child process with PID= %d"%os.getpid()
    for j in range(100000000): 
        m=j
    print "Sum: ",sum(a)

    os._exit(0)



def mul(a):

    print "We are in the child process with PID= %d"%os.getpid()
    k=1
    for j in range(100000000): 
        m=j
    for i in a:
        k=k*i
    print "Multiplication: ",k

def parent(a):
    while True:
        print "We are in the parent process with PID= %d"%os.getpid()
        newpid=os.fork()

        if newpid == 0:
            sum1(a)

        else:
            mul(a)
        if input() == 'q': break

a=[12,12,12,12]
parent(a)

但在此代码中，它仅为一个函数 [ sum1() ] 创建 fork 进程。我想循环执行 fork 进程，每次调用不同的函数。例如，我想在循环中调用以下三个具有不同 fork 进程的函数

def f1(a):
    print a
def f2(b):
    print b
def f3(c):
    print c

类似于

的东西

for i in range(3):
    pid = os.fork()
    if pid == 0:
       f1(a) # then call f2(b) in next iteration and then f3(c)in last iteration
       os._exit(0)

Answer 1

func_map = {0: f1, 1: f2, 2: f3}

def parent(a):
    for i in range(3):
        pid = os.fork()
        if pid == 0:
            func_map[i](a)
            return