From 7737051b114cfa50dc53259624a632ecb6eb2607 Mon Sep 17 00:00:00 2001
From: Dan Stromberg <dstromberg@grokstream.com>
Date: Wed, 11 Dec 2019 08:59:27 -0800
Subject: [PATCH] Use os.getpid() in configdir, to avoid multiprocess
 concurrency issues

---
 lib/matplotlib/__init__.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/matplotlib/__init__.py b/lib/matplotlib/__init__.py
index 11968a34b509..6c79ffb32189 100644
--- a/lib/matplotlib/__init__.py
+++ b/lib/matplotlib/__init__.py
@@ -528,7 +528,7 @@ def _create_tmp_config_or_cache_dir():
     If the config or cache directory cannot be created, create a temporary one.
     """
     configdir = os.environ['MPLCONFIGDIR'] = (
-        tempfile.mkdtemp(prefix='matplotlib-'))
+        tempfile.mkdtemp(prefix='matplotlib-{}-'.format(os.getpid())))
     atexit.register(shutil.rmtree, configdir)
     return configdir