Modernize Thread

- Based on C++11's `thread` and `thread_local`
- No more need to allocate-deallocate or check for null
- No pointer anymore, just a member variable
- Platform-specific implementations no longer needed (except for the few cases of non-portable functions)
- Simpler for `NO_THREADS`
- Thread ids are now the same across platforms (main is 1; others follow)

1 files changed, 2 insertions, 4 deletions

diff --git a/platform/linuxbsd/display_server_x11.cpp b/platform/linuxbsd/display_server_x11.cpp
index 00b90923de..c8632f19f9 100644
--- a/platform/linuxbsd/display_server_x11.cpp
+++ b/platform/linuxbsd/display_server_x11.cpp
@@ -4266,7 +4266,7 @@ DisplayServerX11::DisplayServerX11(const String &p_rendering_driver, WindowMode
 		}
 	}
 
-	events_thread = Thread::create(_poll_events_thread, this);
+	events_thread.start(_poll_events_thread, this);
 
 	_update_real_mouse_position(windows[MAIN_WINDOW_ID]);
 
@@ -4280,9 +4280,7 @@ DisplayServerX11::~DisplayServerX11() {
 	_clipboard_transfer_ownership(XInternAtom(x11_display, "CLIPBOARD", 0), x11_main_window);
 
 	events_thread_done = true;
-	Thread::wait_to_finish(events_thread);
-	memdelete(events_thread);
-	events_thread = nullptr;
+	events_thread.wait_to_finish();
 
 	//destroy all windows
 	for (Map<WindowID, WindowData>::Element *E = windows.front(); E; E = E->next()) {