api/joystick: reduce mutex contention

Don't look for changes in hotplug joysticks by freezing up polling for
joysticks' axis and button.

Issue: #267

1 files changed, 2 insertions, 2 deletions

diff --git a/opentrack/win32-joystick.hpp b/opentrack/win32-joystick.hpp
index 334b617a..3f47d170 100644
--- a/opentrack/win32-joystick.hpp
+++ b/opentrack/win32-joystick.hpp
@@ -100,14 +100,14 @@ private:
 
     class enum_state
     {
-        std::unordered_map<QString, std::shared_ptr<joy>>& joys;
+        std::unordered_map<QString, std::shared_ptr<joy>> joys;
         bool first;
         
         std::vector<QString> all;
         static BOOL CALLBACK EnumJoysticksCallback(const DIDEVICEINSTANCE* pdidInstance, VOID* pContext);
         static BOOL CALLBACK EnumObjectsCallback(const DIDEVICEOBJECTINSTANCE* pdidoi, VOID* ctx);
     public:
-        enum_state(std::unordered_map<QString, std::shared_ptr<joy>>& joys, bool first);
+        enum_state(std::unordered_map<QString, std::shared_ptr<joy>>& joys, bool first, QMutex &mtx);
     };
 };