退出并清理python fork

Question

i am trying to code socket server with fork in python. somehow a new fork will be created when a client is connected and this fork process will handle the connection including send/receive.
i ran this script on Linux centOS and monitor resources with htop/top to see how many forks (task) are shown. the problem is when i kill some fork by using os._exit(0) htop won't be changed (naturally it has to be decreased by killing forks) and when i close python script every thing will be back to normal ( Ram usage and tasks ).
so what i have to do that when i kill some fork by using os._exit(0) , it effects on htop in other hand releases all resources and do not wait until its own parent is killed ?

here it's the code to create forks:

def test(sock):
     //handle socket then return
for i in range (1000):
     sock,addr=socket.accept()
     pid=os.fork()
     if pid==0:
          test(sock)
          os._exit(0)
     elif pid !=-1:
          os.waitpid(-1, os.WNOHANG)

Answer 1

The parent process needs to wait for the child in order for the child process' resources to be released. Until then the process still exists in a "zombie" state, and it will still appear in ps and top etc.

You can call one of os.wait() , os.waitpid() , os.wait3() , or os.wait4() .

os.wait3() with the os.WNOHANG option might be most useful to you as it will wait for any child process and the parent will not block until a child terminates (or it's state changes - wait will return child processes that have been stopped or restarted too).

More details on the underlying system calls can be found in the Linux man page: man 2 wait .