Fix possible "file already exists" error when running the tests in parallel.
This is a perfect example of LBYL going wrong: that code could be executed
by several workers in parallel, and os.mkdir() attempted on the same
path by multiple processes.
diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index 89acb9b..e2e3765 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -162,6 +162,7 @@
import io
import sys
import time
+import errno
import traceback
import warnings
import unittest
@@ -1511,8 +1512,11 @@
if sysconfig.is_python_build():
TEMPDIR = os.path.join(sysconfig.get_config_var('srcdir'), 'build')
TEMPDIR = os.path.abspath(TEMPDIR)
- if not os.path.exists(TEMPDIR):
+ try:
os.mkdir(TEMPDIR)
+ except OSError as e:
+ if e.errno != errno.EEXIST:
+ raise
# Define a writable temp dir that will be used as cwd while running
# the tests. The name of the dir includes the pid to allow parallel