From b425f86121c8c9f3b4a510e522d03e432677dcea Mon Sep 17 00:00:00 2001
From: Jordan Woyak <jordan.woyak@gmail.com>
Date: Thu, 10 Jan 2019 09:02:38 -0600
Subject: ControllerInterface: Allow hotplug callbacks to be unregistered and
 don't reload the entire config from the ini file on hotplug, just update the
 control references. This should fix a crash on shutdown on Android.

---
 .../InputCommon/ControllerInterface/ControllerInterface.cpp  | 12 +++++++++++-
 .../InputCommon/ControllerInterface/ControllerInterface.h    |  9 ++++++---
 2 files changed, 17 insertions(+), 4 deletions(-)

(limited to 'Source/Core/InputCommon/ControllerInterface')

diff --git a/Source/Core/InputCommon/ControllerInterface/ControllerInterface.cpp b/Source/Core/InputCommon/ControllerInterface/ControllerInterface.cpp
index 318b288434..3da92e8b75 100644
--- a/Source/Core/InputCommon/ControllerInterface/ControllerInterface.cpp
+++ b/Source/Core/InputCommon/ControllerInterface/ControllerInterface.cpp
@@ -249,10 +249,20 @@ void ControllerInterface::UpdateInput()
 
 // Register a callback to be called when a device is added or removed (as from the input backends'
 // hotplug thread), or when devices are refreshed
-void ControllerInterface::RegisterDevicesChangedCallback(std::function<void()> callback)
+// Returns a handle for later removing the callback.
+ControllerInterface::HotplugCallbackHandle
+ControllerInterface::RegisterDevicesChangedCallback(std::function<void()> callback)
 {
   std::lock_guard<std::mutex> lk(m_callbacks_mutex);
   m_devices_changed_callbacks.emplace_back(std::move(callback));
+  return std::prev(m_devices_changed_callbacks.end());
+}
+
+// Unregister a device callback.
+void ControllerInterface::UnregisterDevicesChangedCallback(const HotplugCallbackHandle& handle)
+{
+  std::lock_guard<std::mutex> lk(m_callbacks_mutex);
+  m_devices_changed_callbacks.erase(handle);
 }
 
 // Invoke all callbacks that were registered
diff --git a/Source/Core/InputCommon/ControllerInterface/ControllerInterface.h b/Source/Core/InputCommon/ControllerInterface/ControllerInterface.h
index 0d712e5245..7330172421 100644
--- a/Source/Core/InputCommon/ControllerInterface/ControllerInterface.h
+++ b/Source/Core/InputCommon/ControllerInterface/ControllerInterface.h
@@ -6,9 +6,9 @@
 
 #include <atomic>
 #include <functional>
+#include <list>
 #include <memory>
 #include <mutex>
-#include <vector>
 
 #include "Common/WindowSystemInfo.h"
 #include "InputCommon/ControllerInterface/Device.h"
@@ -40,6 +40,8 @@
 class ControllerInterface : public ciface::Core::DeviceContainer
 {
 public:
+  using HotplugCallbackHandle = std::list<std::function<void()>>::iterator;
+
   ControllerInterface() : m_is_init(false) {}
   void Initialize(const WindowSystemInfo& wsi);
   void ChangeWindow(void* hwnd);
@@ -50,11 +52,12 @@ public:
   bool IsInit() const { return m_is_init; }
   void UpdateInput();
 
-  void RegisterDevicesChangedCallback(std::function<void(void)> callback);
+  HotplugCallbackHandle RegisterDevicesChangedCallback(std::function<void(void)> callback);
+  void UnregisterDevicesChangedCallback(const HotplugCallbackHandle& handle);
   void InvokeDevicesChangedCallbacks() const;
 
 private:
-  std::vector<std::function<void()>> m_devices_changed_callbacks;
+  std::list<std::function<void()>> m_devices_changed_callbacks;
   mutable std::mutex m_callbacks_mutex;
   std::atomic<bool> m_is_init;
   std::atomic<bool> m_is_populating_devices{false};
-- 
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