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/*************************************************************************/
/* thread_local.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* 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. */
/*************************************************************************/
#ifndef THREAD_LOCAL_H
#define THREAD_LOCAL_H
#ifdef HAVE_CXX11_THREAD_LOCAL
#define _THREAD_LOCAL_(m_t) thread_local m_t
#else
#if !defined(__GNUC__) && !defined(_MSC_VER)
#error Platform or compiler not supported
#endif
#if defined(__GNUC__)
#ifdef HAVE_GCC___THREAD
#define _THREAD_LOCAL_(m_t) __thread m_t
#else
#define USE_CUSTOM_THREAD_LOCAL
#endif
#elif defined(_MSC_VER)
#ifdef HAVE_DECLSPEC_THREAD
#define _THREAD_LOCAL_(m_t) __declspec(thread) m_t
#else
#define USE_CUSTOM_THREAD_LOCAL
#endif
#endif // __GNUC__ _MSC_VER
#endif // HAVE_CXX11_THREAD_LOCAL
#ifdef USE_CUSTOM_THREAD_LOCAL
#define _THREAD_LOCAL_(m_t) ThreadLocal<m_t>
#endif
#include "core/typedefs.h"
#ifdef WINDOWS_ENABLED
#define _CALLBACK_FUNC_ __stdcall
#else
#define _CALLBACK_FUNC_
#endif
struct ThreadLocalStorage {
void *get_value() const;
void set_value(void *p_value) const;
void alloc(void(_CALLBACK_FUNC_ *p_destr_callback)(void *));
void free();
private:
struct Impl;
Impl *pimpl;
};
template <typename T>
class ThreadLocal {
ThreadLocalStorage storage;
T init_val;
static void _CALLBACK_FUNC_ destr_callback(void *tls_data) {
memdelete(static_cast<T *>(tls_data));
}
T *_tls_get_value() const {
void *tls_data = storage.get_value();
if (tls_data)
return static_cast<T *>(tls_data);
T *data = memnew(T(init_val));
storage.set_value(data);
return data;
}
void _initialize(const T &p_init_val) {
init_val = p_init_val;
storage.alloc(&destr_callback);
}
public:
ThreadLocal() {
_initialize(T());
}
ThreadLocal(const T &p_init_val) {
_initialize(p_init_val);
}
ThreadLocal(const ThreadLocal &other) {
_initialize(*other._tls_get_value());
}
~ThreadLocal() {
storage.free();
}
_FORCE_INLINE_ T *operator&() const {
return _tls_get_value();
}
_FORCE_INLINE_ operator T &() const {
return *_tls_get_value();
}
_FORCE_INLINE_ ThreadLocal &operator=(const T &val) {
T *ptr = _tls_get_value();
*ptr = val;
return *this;
}
};
struct FlagScopeGuard {
FlagScopeGuard(bool &p_flag) :
flag(p_flag) {
flag = !flag;
}
~FlagScopeGuard() {
flag = !flag;
}
private:
bool &flag;
};
#undef _CALLBACK_FUNC_
#define _TLS_RECURSION_GUARD_V_(m_ret) \
static _THREAD_LOCAL_(bool) _recursion_flag_ = false; \
if (_recursion_flag_) \
return m_ret; \
FlagScopeGuard _recursion_guard_(_recursion_flag_);
#define _TLS_RECURSION_GUARD_ \
static _THREAD_LOCAL_(bool) _recursion_flag_ = false; \
if (_recursion_flag_) \
return; \
FlagScopeGuard _recursion_guard_(_recursion_flag_);
#endif // THREAD_LOCAL_H
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