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diff --git a/source/3rd-party/SDL2/src/thread/SDL_systhread.h b/source/3rd-party/SDL2/src/thread/SDL_systhread.h
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+++ b/source/3rd-party/SDL2/src/thread/SDL_systhread.h
@@ -0,0 +1,70 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../SDL_internal.h"
+
+/* These are functions that need to be implemented by a port of SDL */
+
+#ifndef SDL_systhread_h_
+#define SDL_systhread_h_
+
+#include "SDL_thread.h"
+#include "SDL_thread_c.h"
+
+/* This function creates a thread, passing args to SDL_RunThread(),
+   saves a system-dependent thread id in thread->id, and returns 0
+   on success.
+*/
+#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
+extern int SDL_SYS_CreateThread(SDL_Thread * thread, void *args,
+                                pfnSDL_CurrentBeginThread pfnBeginThread,
+                                pfnSDL_CurrentEndThread pfnEndThread);
+#else
+extern int SDL_SYS_CreateThread(SDL_Thread * thread, void *args);
+#endif
+
+/* This function does any necessary setup in the child thread */
+extern void SDL_SYS_SetupThread(const char *name);
+
+/* This function sets the current thread priority */
+extern int SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority);
+
+/* This function waits for the thread to finish and frees any data
+   allocated by SDL_SYS_CreateThread()
+ */
+extern void SDL_SYS_WaitThread(SDL_Thread * thread);
+
+/* Mark thread as cleaned up as soon as it exits, without joining. */
+extern void SDL_SYS_DetachThread(SDL_Thread * thread);
+
+/* Get the thread local storage for this thread */
+extern SDL_TLSData *SDL_SYS_GetTLSData(void);
+
+/* Set the thread local storage for this thread */
+extern int SDL_SYS_SetTLSData(SDL_TLSData *data);
+
+/* This is for internal SDL use, so we don't need #ifdefs everywhere. */
+extern SDL_Thread *
+SDL_CreateThreadInternal(int (SDLCALL * fn) (void *), const char *name,
+                         const size_t stacksize, void *data);
+
+#endif /* SDL_systhread_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */