python 进程间通信

共享内存：

服务端：
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-

from ctypes import *
import time
import json
import mmap
import contextlib
import os

SHM_SIZE = 32

send_data = "sensor1"

while True:
    with open("shared_memory", "w") as f:
        f.write('\x00' * SHM_SIZE)
    f.close()
    with open("shared_memory", "r+") as f:
        with contextlib.closing(mmap.mmap(f.fileno(), SHM_SIZE, access=mmap.ACCESS_WRITE)) as m:
            # ss = json.dumps(send_data).rjust(SHM_SIZE-1, '\x00')
            ss = json.dumps(send_data)
            m.write(ss.encode())
            m.flush()
            print(json.dumps(send_data).encode())
            time.sleep(1)
        m.close()
    f.close()

客户端：
#!/usr/bin/env python  
# -*- coding: utf-8 -*-  

from ctypes import * 
import time
import json
import mmap
import contextlib

SHM_SIZE = 32

while True:
	with open("shared_memory", "r") as f:
		with contextlib.closing(mmap.mmap(f.fileno(), SHM_SIZE, access=mmap.ACCESS_READ)) as m:
			s = m.read(SHM_SIZE).replace(b'\x00', b"")
			print(s)
			time.sleep(1)
		m.close()
	f.close()