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Added spin lock and rwlock from godot.

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Relintai 2022-02-04 07:57:57 +01:00
parent 33ba5337b7
commit a834ef7e87
2 changed files with 167 additions and 0 deletions
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116
core/threading/rw_lock.h Normal file
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/*************************************************************************/
/* rw_lock.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 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 RWLOCK_H
#define RWLOCK_H
#include "core/error_list.h"
#if !defined(NO_THREADS)
#include <shared_mutex>
class RWLock {
mutable std::shared_timed_mutex mutex;
public:
// Lock the rwlock, block if locked by someone else
void read_lock() const {
mutex.lock_shared();
}
// Unlock the rwlock, let other threads continue
void read_unlock() const {
mutex.unlock_shared();
}
// Attempt to lock the rwlock, OK on success, ERR_BUSY means it can't lock.
Error read_try_lock() const {
return mutex.try_lock_shared() ? OK : ERR_BUSY;
}
// Lock the rwlock, block if locked by someone else
void write_lock() {
mutex.lock();
}
// Unlock the rwlock, let other thwrites continue
void write_unlock() {
mutex.unlock();
}
// Attempt to lock the rwlock, OK on success, ERR_BUSY means it can't lock.
Error write_try_lock() {
return mutex.try_lock() ? OK : ERR_BUSY;
}
};
#else
class RWLock {
public:
void read_lock() const {}
void read_unlock() const {}
Error read_try_lock() const { return OK; }
void write_lock() {}
void write_unlock() {}
Error write_try_lock() { return OK; }
};
#endif
class RWLockRead {
const RWLock &lock;
public:
RWLockRead(const RWLock &p_lock) :
lock(p_lock) {
lock.read_lock();
}
~RWLockRead() {
lock.read_unlock();
}
};
class RWLockWrite {
RWLock &lock;
public:
RWLockWrite(RWLock &p_lock) :
lock(p_lock) {
lock.write_lock();
}
~RWLockWrite() {
lock.write_unlock();
}
};
#endif // RWLOCK_H

51
core/threading/spin_lock.h Normal file
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/*************************************************************************/
/* spin_lock.h */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 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