input: add enumeration threads for each hid_pad_handler

There was a roughly 60 ms lag for each hid handler every 2 seconds. (sucks if you use all 3 hid handlers)

Utilities/Timer.h

@@ -12,7 +12,7 @@ private:
 	steady_clock::time_point m_end;
 
 public:
-	Timer() : m_stopped(false)
+	Timer() : m_stopped(false), m_start(steady_clock::now())
 	{
 	}
 

rpcs3/Input/hid_pad_handler.cpp

@@ -3,6 +3,9 @@
 #include "ds4_pad_handler.h"
 #include "dualsense_pad_handler.h"
 #include "util/logs.hpp"
+#include "Utilities/Timer.h"
+#include "Emu/System.h"
+#include "pad_thread.h"
 
 #include <algorithm>
 #include <memory>
@@ -23,6 +26,13 @@ hid_pad_handler<Device>::hid_pad_handler(pad_handler type, std::vector<id_pair>
 template <class Device>
 hid_pad_handler<Device>::~hid_pad_handler()
 {
+	if (m_enumeration_thread)
+	{
+		auto& enumeration_thread = *m_enumeration_thread;
+		enumeration_thread = thread_state::aborting;
+		enumeration_thread();
+	}
+
 	for (auto& controller : m_controllers)
 	{
 		if (controller.second && controller.second->hidDevice)
@@ -59,21 +69,30 @@ bool hid_pad_handler<Device>::Init()
 	}
 
 	enumerate_devices();
+	update_devices();
 
 	m_is_init = true;
+
+	m_enumeration_thread = std::make_unique<named_thread<std::function<void()>>>(fmt::format("%s Enumerator", m_type), [this]()
+	{
+		while (thread_ctrl::state() != thread_state::aborting)
+		{
+			if (pad::g_enabled && Emu.IsRunning())
+			{
+				enumerate_devices();
+			}
+
+			thread_ctrl::wait_for(2'000'000);
+		}
+	});
+
 	return true;
 }
 
 template <class Device>
 void hid_pad_handler<Device>::ThreadProc()
 {
-	const auto now     = std::chrono::system_clock::now();
-	const auto elapsed = std::chrono::duration_cast<std::chrono::milliseconds>(now - m_last_enumeration).count();
-	if (elapsed > 2000)
-	{
-		m_last_enumeration = now;
-		enumerate_devices();
-	}
+	update_devices();
 
 	PadHandlerBase::ThreadProc();
 }
@@ -97,6 +116,7 @@ std::vector<std::string> hid_pad_handler<Device>::ListDevices()
 template <class Device>
 void hid_pad_handler<Device>::enumerate_devices()
 {
+	Timer timer;
 	std::set<std::string> device_paths;
 	std::map<std::string, std::wstring_view> serials;
 
@@ -113,18 +133,29 @@ void hid_pad_handler<Device>::enumerate_devices()
 		}
 		hid_free_enumeration(head);
 	}
+	hid_log.notice("%s enumeration found %d devices (%f ms)", m_type, device_paths.size(), timer.GetElapsedTimeInMilliSec());
 
-	if (m_last_enumerated_devices == device_paths)
+	std::lock_guard lock(m_enumeration_mutex);
+	m_new_enumerated_devices = device_paths;
+	m_enumerated_serials = serials;
+}
+
+template <class Device>
+void hid_pad_handler<Device>::update_devices()
+{
+	std::lock_guard lock(m_enumeration_mutex);
+
+	if (m_last_enumerated_devices == m_new_enumerated_devices)
 	{
 		return;
 	}
 
-	m_last_enumerated_devices = device_paths;
+	m_last_enumerated_devices = m_new_enumerated_devices;
 
 	// Scrap devices that are not in the new list
 	for (auto& controller : m_controllers)
 	{
-		if (controller.second && !controller.second->path.empty() && !device_paths.contains(controller.second->path))
+		if (controller.second && !controller.second->path.empty() && !m_new_enumerated_devices.contains(controller.second->path))
 		{
 			hid_close(controller.second->hidDevice);
 			cfg_pad* config = controller.second->config;
@@ -136,7 +167,7 @@ void hid_pad_handler<Device>::enumerate_devices()
 	bool warn_about_drivers = false;
 
 	// Find and add new devices
-	for (const auto& path : device_paths)
+	for (const auto& path : m_new_enumerated_devices)
 	{
 		// Check if we have at least one virtual controller left
 		if (std::none_of(m_controllers.cbegin(), m_controllers.cend(), [](const auto& c) { return !c.second || !c.second->hidDevice; }))
@@ -149,7 +180,7 @@ void hid_pad_handler<Device>::enumerate_devices()
 		hid_device* dev = hid_open_path(path.c_str());
 		if (dev)
 		{
-			check_add_device(dev, path, serials[path]);
+			check_add_device(dev, path, m_enumerated_serials[path]);
 		}
 		else
 		{

rpcs3/Input/hid_pad_handler.h

@@ -2,6 +2,7 @@
 
 #include "Emu/Io/PadHandler.h"
 #include "Utilities/CRC.h"
+#include "Utilities/Thread.h"
 
 #include "hidapi.h"
 
@@ -77,10 +78,14 @@ protected:
 	std::map<std::string, std::shared_ptr<Device>> m_controllers;
 
 	bool m_is_init = false;
-	std::chrono::system_clock::time_point m_last_enumeration;
 	std::set<std::string> m_last_enumerated_devices;
+	std::set<std::string> m_new_enumerated_devices;
+	std::map<std::string, std::wstring_view> m_enumerated_serials;
+	std::mutex m_enumeration_mutex;
+	std::unique_ptr<named_thread<std::function<void()>>> m_enumeration_thread;
 
 	void enumerate_devices();
+	void update_devices();
 	std::shared_ptr<Device> get_hid_device(const std::string& padId);
 
 	virtual void check_add_device(hid_device* hidDevice, std::string_view path, std::wstring_view serial) = 0;