Python mmap内存映射实现进程间的通信

进程1的程序代码：

import mmap
import time
# write a simple example file
#with open("hello.txt", "wb") as f:
 #   f.write(b"Hello Python!n")

with open("hello.txt", "r+b") as f:
    # memory-map the file, size 0 means whole file
    mm = mmap.mmap(f.fileno(), 0)
    # read content via standard file methods
    print(mm.readline())  # prints b"Hello Python!n"
    # read content via slice notation
    print(mm[:5])  # prints b"Hello"
    # update content using slice notation;
    # note that new content must have same size
    mm[6:] = b" ktest!n"
    time.sleep(60)
    # ... and read again using standard file methods
    mm.seek(0)
    print(mm.readline())  # prints b"Hello  world!n"
    # close the map
    mm.close()

负责对内存写，充当生产者的身份。

进程2的程序代码：

import mmap
import time
# write a simple example file
# with open("hello.txt"