1 files changed, 72 insertions, 0 deletions
diff --git a/Source/external/SDL2/src/thread/windows/SDL_systls.c b/Source/external/SDL2/src/thread/windows/SDL_systls.c
new file mode 100644
index 0000000..888fd74
--- /dev/null
+++ b/Source/external/SDL2/src/thread/windows/SDL_systls.c
@@ -0,0 +1,72 @@
+/*
+  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"
+
+#if SDL_THREAD_WINDOWS
+
+#include "../../core/windows/SDL_windows.h"
+
+#include "SDL_thread.h"
+#include "../SDL_thread_c.h"
+
+static DWORD thread_local_storage = TLS_OUT_OF_INDEXES;
+static SDL_bool generic_local_storage = SDL_FALSE;
+
+SDL_TLSData *
+SDL_SYS_GetTLSData(void)
+{
+    if (thread_local_storage == TLS_OUT_OF_INDEXES && !generic_local_storage) {
+        static SDL_SpinLock lock;
+        SDL_AtomicLock(&lock);
+        if (thread_local_storage == TLS_OUT_OF_INDEXES && !generic_local_storage) {
+            DWORD storage = TlsAlloc();
+            if (storage != TLS_OUT_OF_INDEXES) {
+                SDL_MemoryBarrierRelease();
+                thread_local_storage = storage;
+            } else {
+                generic_local_storage = SDL_TRUE;
+            }
+        }
+        SDL_AtomicUnlock(&lock);
+    }
+    if (generic_local_storage) {
+        return SDL_Generic_GetTLSData();
+    }
+    SDL_MemoryBarrierAcquire();
+    return (SDL_TLSData *)TlsGetValue(thread_local_storage);
+}
+
+int
+SDL_SYS_SetTLSData(SDL_TLSData *data)
+{
+    if (generic_local_storage) {
+        return SDL_Generic_SetTLSData(data);
+    }
+    if (!TlsSetValue(thread_local_storage, data)) {
+        return SDL_SetError("TlsSetValue() failed");
+    }
+    return 0;
+}
+
+#endif /* SDL_THREAD_WINDOWS */
+
+/* vi: set ts=4 sw=4 expandtab: */