Bug report

Bug description:

 from multiprocessing.conenction import wait
 import os
 from time import time
 
 print(os.getpid())
 start = t
 
 while True:

    for pipe in wait([], 1):
        pass
    print(time()-t)

multiprocessing.connection.wait causes 100% CPU load if the object list is empty; otherwise the CPU load very low

CPython versions tested on:

3.12

Operating systems tested on:

Windows

Linked PRs

• gh-145587: fix busy loop in multiprocessing.connection.wait on Windows #145597