/**************************************************************************/
/*  condition_variable.h                                                  */
/**************************************************************************/
/*                         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.                 */
/**************************************************************************/

#pragma once

#include "core/os/mutex.h"
#include "core/os/safe_binary_mutex.h"

#ifdef THREADS_ENABLED

#ifdef MINGW_ENABLED
#define MINGW_STDTHREAD_REDUNDANCY_WARNING
#include <thirdparty/mingw-std-threads/mingw.condition_variable.h>
#define THREADING_NAMESPACE mingw_stdthread
#else
#include <condition_variable>
#define THREADING_NAMESPACE std
#endif

// An object one or multiple threads can wait on a be notified by some other.
// Normally, you want to use a semaphore for such scenarios, but when the
// condition is something different than a count being greater than zero
// (which is the built-in logic in a semaphore) or you want to provide your
// own mutex to tie the wait-notify to some other behavior, you need to use this.

class ConditionVariable {
	mutable THREADING_NAMESPACE::condition_variable condition;

public:
	template <typename BinaryMutexT>
	_ALWAYS_INLINE_ void wait(const MutexLock<BinaryMutexT> &p_lock) const {
		condition.wait(p_lock._get_lock());
	}

	template <int Tag>
	_ALWAYS_INLINE_ void wait(const MutexLock<SafeBinaryMutex<Tag>> &p_lock) const {
		condition.wait(p_lock.mutex._get_lock());
	}

	_ALWAYS_INLINE_ void notify_one() const {
		condition.notify_one();
	}

	_ALWAYS_INLINE_ void notify_all() const {
		condition.notify_all();
	}
};

#else // No threads.

class ConditionVariable {
public:
	template <typename BinaryMutexT>
	void wait(const MutexLock<BinaryMutexT> &p_lock) const {}
	void notify_one() const {}
	void notify_all() const {}
};

#endif // THREADS_ENABLED
