godot/core/spin_lock.h
Rémi Verschelde db81928e08 Vulkan: Move thirdparty code out of drivers, style fixes
- `vk_enum_string_helper.h` is a generated file taken from the SDK
  (Vulkan-ValidationLayers).
- `vk_mem_alloc.h` is a library from GPUOpen:
  https://github.com/GPUOpen-LibrariesAndSDKs/VulkanMemoryAllocator
2020-02-11 14:08:44 +01:00

51 lines
2.5 KiB
C++

/*************************************************************************/
/* spin_lock.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 SPIN_LOCK_H
#define SPIN_LOCK_H
#include "core/typedefs.h"
#include <atomic>
class SpinLock {
std::atomic_flag locked = ATOMIC_FLAG_INIT;
public:
_ALWAYS_INLINE_ void lock() {
while (locked.test_and_set(std::memory_order_acquire)) {
;
}
}
_ALWAYS_INLINE_ void unlock() {
locked.clear(std::memory_order_release);
}
};
#endif // SPIN_LOCK_H