/*************************************************************************/ /* 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