steamcompmgr: Ensure wlserver + sdlwindow shutdown on exit

src/sdlwindow.cpp

@@ -463,11 +463,14 @@ void inputSDLThreadRun( void )
 	}
 }
 
+pthread_t sdlwindow_thread = {};
+
 bool sdlwindow_init( void )
 {
 	g_SDLInitLock.lock();
 
 	std::thread inputSDLThread( inputSDLThreadRun );
+	sdlwindow_thread = inputSDLThread.native_handle();
 	inputSDLThread.detach();
 
 	// When this returns SDL_Init should be over
@@ -476,6 +479,11 @@ bool sdlwindow_init( void )
 	return g_bSDLInitOK;
 }
 
+void sdlwindow_shutdown( void )
+{
+	pthread_cancel(sdlwindow_thread);
+}
+
 void sdlwindow_title( std::shared_ptr<std::string> title, std::shared_ptr<std::vector<uint32_t>> icon )
 {
 	if ( !BIsSDLSession() )

src/sdlwindow.hpp

@@ -9,6 +9,7 @@
 #define PRIMARYSELECTION 1
 
 bool sdlwindow_init( void );
+void sdlwindow_shutdown( void );
 
 void sdlwindow_update( void );
 void sdlwindow_title( std::shared_ptr<std::string> title, std::shared_ptr<std::vector<uint32_t>> icon );

src/steamcompmgr.cpp

@@ -5847,6 +5847,12 @@ steamcompmgr_exit(void)
 		statsThreadSem.signal();
 	}
 
+    sdlwindow_shutdown();
+
+    wlserver_lock();
+    wlserver_force_shutdown();
+    wlserver_unlock(false);
+
 	finish_drm( &g_DRM );
 
 	pthread_exit(NULL);