From 0e06c504020fa1488dbd13538c578706f36b5b36 Mon Sep 17 00:00:00 2001
From: Luke Campagnola <lukec@alleninstitute.org>
Date: Fri, 28 Jul 2017 15:57:45 -0700
Subject: [PATCH] Catch OSError from ForkedProcess that has already exited.

---
 pyqtgraph/multiprocess/processes.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/pyqtgraph/multiprocess/processes.py b/pyqtgraph/multiprocess/processes.py
index c7e4a80c..02f259e5 100644
--- a/pyqtgraph/multiprocess/processes.py
+++ b/pyqtgraph/multiprocess/processes.py
@@ -321,9 +321,14 @@ class ForkedProcess(RemoteEventHandler):
         #os.kill(pid, 9)  
         try:
             self.close(callSync='sync', timeout=timeout, noCleanup=True)  ## ask the child process to exit and require that it return a confirmation.
-            os.waitpid(self.childPid, 0)
         except IOError:  ## probably remote process has already quit
             pass  
+        
+        try:
+            os.waitpid(self.childPid, 0)
+        except OSError:  ## probably remote process has already quit
+            pass
+        
         self.hasJoined = True
 
     def kill(self):