[Device] add lock for global variable of led and battery (#49)

diff --git a/src/Tizen.System/Device/Battery.cs b/src/Tizen.System/Device/Battery.cs
index 5c9ebe0..8f05d34 100755 (executable)
--- a/src/Tizen.System/Device/Battery.cs
+++ b/src/Tizen.System/Device/Battery.cs
@@ -129,7 +129,7 @@ namespace Tizen.System
             }
         }
 
-        private static EventHandler<BatteryPercentChangedEventArgs> s_capacityChanged;
+        private static event EventHandler<BatteryPercentChangedEventArgs> s_capacityChanged;
         /// <summary>
         /// CapacityChanged is triggered when the battery charge percentage is changed.
         /// </summary>

diff --git a/src/Tizen.System/Device/Led.cs b/src/Tizen.System/Device/Led.cs
index 8811f31..5f100e7 100755 (executable)
--- a/src/Tizen.System/Device/Led.cs
+++ b/src/Tizen.System/Device/Led.cs
@@ -172,7 +172,7 @@ namespace Tizen.System
         }
 
 
-        private static EventHandler<LedBrightnessChangedEventArgs> s_brightnessChanged;
+        private static event EventHandler<LedBrightnessChangedEventArgs> s_brightnessChanged;
         /// <summary>
         /// StateChanged is raised when the LED state is changed.
         /// </summary>