From df488237d457eeffbe5c8281b1c19a8e9c5de596 Mon Sep 17 00:00:00 2001
From: David Wilson <dw@botanicus.net>
Date: Sat, 17 Mar 2018 01:30:47 +0545
Subject: [PATCH] core: fix race in PidfulStreamHandler

Need to re-test with the lock held, else >1 threads can end up waiting
for lock then reopening the log repeatedly.
---
 mitogen/core.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mitogen/core.py b/mitogen/core.py
index 151d19d8..3a56971a 100644
--- a/mitogen/core.py
+++ b/mitogen/core.py
@@ -219,6 +219,8 @@ class PidfulStreamHandler(logging.StreamHandler):
     def _reopen(self):
         self.acquire()
         try:
+            if self.open_pid == os.getpid():
+                return
             ts = time.strftime('%Y%m%d_%H%M%S')
             path = self.template % (os.getpid(), ts)
             self.stream = open(path, 'w', 1)