*initHEADmaster

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diff --git a/source/3rd-party/SDL2/src/thread/SDL_thread_c.h b/source/3rd-party/SDL2/src/thread/SDL_thread_c.h
new file mode 100644
index 0000000..b68f90e
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+++ b/source/3rd-party/SDL2/src/thread/SDL_thread_c.h
@@ -0,0 +1,95 @@
+/*
+  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"
+
+#ifndef SDL_thread_c_h_
+#define SDL_thread_c_h_
+
+#include "SDL_thread.h"
+
+/* Need the definitions of SYS_ThreadHandle */
+#if SDL_THREADS_DISABLED
+#include "generic/SDL_systhread_c.h"
+#elif SDL_THREAD_PTHREAD
+#include "pthread/SDL_systhread_c.h"
+#elif SDL_THREAD_WINDOWS
+#include "windows/SDL_systhread_c.h"
+#elif SDL_THREAD_PSP
+#include "psp/SDL_systhread_c.h"
+#elif SDL_THREAD_STDCPP
+#include "stdcpp/SDL_systhread_c.h"
+#else
+#error Need thread implementation for this platform
+#include "generic/SDL_systhread_c.h"
+#endif
+#include "../SDL_error_c.h"
+
+typedef enum SDL_ThreadState
+{
+    SDL_THREAD_STATE_ALIVE,
+    SDL_THREAD_STATE_DETACHED,
+    SDL_THREAD_STATE_ZOMBIE,
+    SDL_THREAD_STATE_CLEANED,
+} SDL_ThreadState;
+
+/* This is the system-independent thread info structure */
+struct SDL_Thread
+{
+    SDL_threadID threadid;
+    SYS_ThreadHandle handle;
+    int status;
+    SDL_atomic_t state;  /* SDL_THREAD_STATE_* */
+    SDL_error errbuf;
+    char *name;
+    size_t stacksize;  /* 0 for default, >0 for user-specified stack size. */
+    void *data;
+};
+
+/* This is the function called to run a thread */
+extern void SDL_RunThread(void *data);
+
+/* This is the system-independent thread local storage structure */
+typedef struct {
+    unsigned int limit;
+    struct {
+        void *data;
+        void (SDLCALL *destructor)(void*);
+    } array[1];
+} SDL_TLSData;
+
+/* This is how many TLS entries we allocate at once */
+#define TLS_ALLOC_CHUNKSIZE 4
+
+/* Get cross-platform, slow, thread local storage for this thread.
+   This is only intended as a fallback if getting real thread-local
+   storage fails or isn't supported on this platform.
+ */
+extern SDL_TLSData *SDL_Generic_GetTLSData(void);
+
+/* Set cross-platform, slow, thread local storage for this thread.
+   This is only intended as a fallback if getting real thread-local
+   storage fails or isn't supported on this platform.
+ */
+extern int SDL_Generic_SetTLSData(SDL_TLSData *data);
+
+#endif /* SDL_thread_c_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */