ControllerInterface: Add synchronisation

Since we may have to add/access devices from different threads, this
adds synchronisation to anything that touches m_devices.

Source/Core/InputCommon/ControllerInterface/ControllerInterface.cpp

@@ -104,6 +104,8 @@ void ControllerInterface::Shutdown()
   if (!m_is_init)
     return;
 
+  std::lock_guard<std::mutex> lk(m_devices_mutex);
+
   for (ciface::Core::Device* d : m_devices)
   {
     // Set outputs to ZERO before destroying device
@@ -141,6 +143,7 @@ void ControllerInterface::Shutdown()
 
 void ControllerInterface::AddDevice(ciface::Core::Device* device)
 {
+  std::lock_guard<std::mutex> lk(m_devices_mutex);
   m_devices.push_back(device);
 }
 
@@ -151,6 +154,7 @@ void ControllerInterface::AddDevice(ciface::Core::Device* device)
 //
 void ControllerInterface::UpdateInput()
 {
+  std::lock_guard<std::mutex> lk(m_devices_mutex);
   for (ciface::Core::Device* d : m_devices)
     d->UpdateInput();
 }

Source/Core/InputCommon/ControllerInterface/ControllerInterface.h

@@ -6,6 +6,7 @@
 
 #include <algorithm>
 #include <map>
+#include <mutex>
 #include <sstream>
 #include <string>
 #include <vector>

Source/Core/InputCommon/ControllerInterface/Device.h

@@ -4,6 +4,7 @@
 
 #pragma once
 
+#include <mutex>
 #include <string>
 #include <vector>
 
@@ -167,6 +168,7 @@ public:
   Device* FindDevice(const DeviceQualifier& devq) const;
 
 protected:
+  std::mutex m_devices_mutex;
   std::vector<Device*> m_devices;
 };
 }