initial commit, 4.5 stable

thirdparty/sdl/thread/pthread/SDL_systls.c

@@ -0,0 +1,78 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 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"
+#include "../SDL_systhread.h"
+#include "../SDL_thread_c.h"
+
+#include <pthread.h>
+
+#define INVALID_PTHREAD_KEY ((pthread_key_t)-1)
+
+static pthread_key_t thread_local_storage = INVALID_PTHREAD_KEY;
+static bool generic_local_storage = false;
+
+void SDL_SYS_InitTLSData(void)
+{
+    if (thread_local_storage == INVALID_PTHREAD_KEY && !generic_local_storage) {
+        if (pthread_key_create(&thread_local_storage, NULL) != 0) {
+            thread_local_storage = INVALID_PTHREAD_KEY;
+            SDL_Generic_InitTLSData();
+            generic_local_storage = true;
+        }
+    }
+}
+
+SDL_TLSData *SDL_SYS_GetTLSData(void)
+{
+    if (generic_local_storage) {
+        return SDL_Generic_GetTLSData();
+    }
+
+    if (thread_local_storage != INVALID_PTHREAD_KEY) {
+        return (SDL_TLSData *)pthread_getspecific(thread_local_storage);
+    }
+    return NULL;
+}
+
+bool SDL_SYS_SetTLSData(SDL_TLSData *data)
+{
+    if (generic_local_storage) {
+        return SDL_Generic_SetTLSData(data);
+    }
+
+    if (pthread_setspecific(thread_local_storage, data) != 0) {
+        return SDL_SetError("pthread_setspecific() failed");
+    }
+    return true;
+}
+
+void SDL_SYS_QuitTLSData(void)
+{
+    if (generic_local_storage) {
+        SDL_Generic_QuitTLSData();
+        generic_local_storage = false;
+    } else {
+        if (thread_local_storage != INVALID_PTHREAD_KEY) {
+            pthread_key_delete(thread_local_storage);
+            thread_local_storage = INVALID_PTHREAD_KEY;
+        }
+    }
+}