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/*************************************************************************/
/* rw_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 RW_LOCK_H
#define RW_LOCK_H
#include "core/error_list.h"
class RWLock {
protected:
static RWLock *(*create_func)();
public:
virtual void read_lock() = 0; ///< Lock the rwlock, block if locked by someone else
virtual void read_unlock() = 0; ///< Unlock the rwlock, let other threads continue
virtual Error read_try_lock() = 0; ///< Attempt to lock the rwlock, OK on success, ERROR means it can't lock.
virtual void write_lock() = 0; ///< Lock the rwlock, block if locked by someone else
virtual void write_unlock() = 0; ///< Unlock the rwlock, let other thwrites continue
virtual Error write_try_lock() = 0; ///< Attempt to lock the rwlock, OK on success, ERROR means it can't lock.
static RWLock *create(); ///< Create a rwlock
virtual ~RWLock() {}
};
class RWLockRead {
RWLock *lock;
public:
RWLockRead(const RWLock *p_lock) {
lock = const_cast<RWLock *>(p_lock);
if (lock)
lock->read_lock();
}
~RWLockRead() {
if (lock)
lock->read_unlock();
}
};
class RWLockWrite {
RWLock *lock;
public:
RWLockWrite(RWLock *p_lock) {
lock = p_lock;
if (lock)
lock->write_lock();
}
~RWLockWrite() {
if (lock)
lock->write_unlock();
}
};
#endif // RW_LOCK_H
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