From a1cbc45b884871635b6f658336cd166575b9e4d5 Mon Sep 17 00:00:00 2001
From: Jakob Ketterl <jakob.ketterl@gmx.de>
Date: Thu, 31 Dec 2020 23:18:01 +0100
Subject: [PATCH] prevent multiple creation of cpu usage thread

---
 owrx/cpu.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/owrx/cpu.py b/owrx/cpu.py
index 28c9066..9405b8f 100644
--- a/owrx/cpu.py
+++ b/owrx/cpu.py
@@ -7,11 +7,13 @@ logger = logging.getLogger(__name__)
 
 class CpuUsageThread(threading.Thread):
     sharedInstance = None
+    creationLock = threading.Lock()
 
     @staticmethod
     def getSharedInstance():
-        if CpuUsageThread.sharedInstance is None:
-            CpuUsageThread.sharedInstance = CpuUsageThread()
+        with CpuUsageThread.creationLock:
+            if CpuUsageThread.sharedInstance is None:
+                CpuUsageThread.sharedInstance = CpuUsageThread()
         return CpuUsageThread.sharedInstance
 
     def __init__(self):