/**************************************************************************/
/*  thread_local.cpp                                                      */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
/*                                                                        */
/* Permission is hereby granted, free of charge, to any person obtaining  */
/* a copy of this software and associated documentation files (the        */
/* "Software"), to deal in the Software without restriction, including    */
/* without limitation the rights to use, copy, modify, merge, publish,    */
/* distribute, sublicense, and/or sell copies of the Software, and to     */
/* permit persons to whom the Software is furnished to do so, subject to  */
/* the following conditions:                                              */
/*                                                                        */
/* The above copyright notice and this permission notice shall be         */
/* included in all copies or substantial portions of the Software.        */
/*                                                                        */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
/**************************************************************************/

#include "thread_local.h"

#ifdef WINDOWS_ENABLED
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#else
#include <pthread.h>
#endif

#include "core/os/memory.h"
#include "core/print_string.h"

struct ThreadLocalStorage::Impl {
#ifdef WINDOWS_ENABLED
	DWORD dwFlsIndex;
#else
	pthread_key_t key;
#endif

	void *get_value() const {
#ifdef WINDOWS_ENABLED
		return FlsGetValue(dwFlsIndex);
#else
		return pthread_getspecific(key);
#endif
	}

	void set_value(void *p_value) const {
#ifdef WINDOWS_ENABLED
		FlsSetValue(dwFlsIndex, p_value);
#else
		pthread_setspecific(key, p_value);
#endif
	}

#ifdef WINDOWS_ENABLED
#define _CALLBACK_FUNC_ __stdcall
#else
#define _CALLBACK_FUNC_
#endif

	Impl(void(_CALLBACK_FUNC_ *p_destr_callback_func)(void *)) {
#ifdef WINDOWS_ENABLED
		dwFlsIndex = FlsAlloc(p_destr_callback_func);
		ERR_FAIL_COND(dwFlsIndex == FLS_OUT_OF_INDEXES);
#else
		pthread_key_create(&key, p_destr_callback_func);
#endif
	}

	~Impl() {
#ifdef WINDOWS_ENABLED
		FlsFree(dwFlsIndex);
#else
		pthread_key_delete(key);
#endif
	}
};

void *ThreadLocalStorage::get_value() const {
	return pimpl->get_value();
}

void ThreadLocalStorage::set_value(void *p_value) const {
	pimpl->set_value(p_value);
}

void ThreadLocalStorage::alloc(void(_CALLBACK_FUNC_ *p_destr_callback)(void *)) {
	pimpl = memnew(ThreadLocalStorage::Impl(p_destr_callback));
}

#undef _CALLBACK_FUNC_

void ThreadLocalStorage::free() {
	memdelete(pimpl);
	pimpl = NULL;
}
