我的猜测是:
arr
存储3个指针。f1()
将它们分配给当前进程之外没有意义的内存地址。f2()
尝试访问此时包含垃圾邮件的无意义地址。
分配对所有过程都有意义的值似乎有帮助:
from __future__ import print_function
import ctypes
import time
from multiprocessing import Process, Array, Value
values = [(s*4).encode('ascii') for s in 'abc']
def f1(a, v):
for i, s in enumerate(values):
a[i] = s
v.value += 1
print("f1 : ", a[:], v.value)
def f2(a,v):
v.value += 1
print("f2 : ", a[:], v.value)
def main():
val = Value(ctypes.c_int, 0)
arr = Array(ctypes.c_char_p, 3)
print("Before :", arr[:], val.value)
p = Process(target=f1, args=(arr, val))
p2 = Process(target=f2, args=(arr, val))
p.start()
p2.start()
p.join()
p2.join()
print("After : ", arr[:], val.value)
if __name__ == '__main__':
main()