Fix event listener creation on GpioPin (#76)

nanoframework · Mar 7, 2019 · 24322d5 · 24322d5
1 parent 344e23f
commit 24322d5
Showing 1 changed file with 8 additions and 1 deletion.
diff --git a/source/Windows.Devices.Gpio/GpioPin.cs b/source/Windows.Devices.Gpio/GpioPin.cs
@@ -41,8 +41,15 @@ public sealed class GpioPin : IGpioPin, IDisposable
         {
             _pinNumber = pinNumber;
 
-            s_eventListener = new GpioPinEventListener();
             _syncLock = new object();
+
+            lock (_syncLock)
+            {
+                if (s_eventListener == null)
+                {
+                    s_eventListener = new GpioPinEventListener();
+                }
+            }
         }
 
         internal bool Init()