Do not use os.getpid() and tempfile._get_candidate_names().

Author: serhiy-storchaka

Lib/asyncio/windows_utils.py

@@ -8,8 +8,8 @@
 import _winapi
 import msvcrt
 import os
+import random
 import subprocess
-import tempfile
 import warnings
 
 
@@ -48,12 +48,10 @@ def pipe(*, duplex=False, overlapped=(True, True), bufsize=BUFSIZE):
     else:
         flags_and_attribs = 0
 
-    prefix = fr'\\.\pipe\python-pipe-{os.getpid()}-'
-    names = tempfile._get_candidate_names()
     h1 = h2 = None
     try:
         while True:
-            address = prefix + next(names)
+            address = r'\\.\pipe\python-pipe-' + random.randbytes(8).hex()
             try:
                 h1 = _winapi.CreateNamedPipe(
                     address, openmode, _winapi.PIPE_WAIT,

Lib/multiprocessing/connection.py

@@ -12,6 +12,7 @@
 import errno
 import io
 import os
+import random
 import sys
 import socket
 import struct
@@ -75,7 +76,7 @@ def arbitrary_address(family):
     elif family == 'AF_UNIX':
         return tempfile.mktemp(prefix='sock-', dir=util.get_temp_dir())
     elif family == 'AF_PIPE':
-        return fr'\\.\pipe\pyc-{os.getpid()}-{next(tempfile._get_candidate_names())}'
+        return r'\\.\pipe\pyc-' + random.randbytes(8).hex()
     else:
         raise ValueError('unrecognized family')