18fbdbb456
Main: - It's now implemented thanks to `<mutex>`. No more platform-specific implementations. - `BinaryMutex` (non-recursive) is added, as an alternative for special cases. - Doesn't need allocation/deallocation anymore. It can live in the stack and be part of other classes. - Because of that, it's methods are now `const` and the inner mutex is `mutable` so it can be easily used in `const` contexts. - A no-op implementation is provided if `NO_THREADS` is defined. No more need to add `#ifdef NO_THREADS` just for this. - `MutexLock` now takes a reference. At this point the cases of null `Mutex`es are rare. If you ever need that, just don't use `MutexLock`. - Thread-safe utilities are therefore simpler now. Misc.: - `ScopedMutexLock` is dropped and replaced by `MutexLock`, because they were pretty much the same. - Every case of lock, do-something, unlock is replaced by `MutexLock` (complex cases where it's not straightfoward are kept as as explicit lock and unlock). - `ShaderRD` contained an `std::mutex`, which has been replaced by `Mutex`.
101 lines
3.5 KiB
C++
101 lines
3.5 KiB
C++
/*************************************************************************/
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/* mutex.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef MUTEX_H
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#define MUTEX_H
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#include "core/error_list.h"
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#include "core/typedefs.h"
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#if !(defined NO_THREADS)
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#include <mutex>
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template <class StdMutexT>
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class MutexImpl {
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mutable StdMutexT mutex;
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public:
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_ALWAYS_INLINE_ void lock() const {
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mutex.lock();
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}
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_ALWAYS_INLINE_ void unlock() const {
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mutex.unlock();
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}
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_ALWAYS_INLINE_ Error try_lock() const {
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return mutex.try_lock() ? OK : ERR_BUSY;
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}
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};
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template <class MutexT>
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class MutexLock {
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const MutexT &mutex;
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public:
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_ALWAYS_INLINE_ explicit MutexLock(const MutexT &p_mutex) :
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mutex(p_mutex) {
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mutex.lock();
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}
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_ALWAYS_INLINE_ ~MutexLock() {
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mutex.unlock();
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}
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};
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#else
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template <class StdMutexType>
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class MutexImpl {
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public:
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_ALWAYS_INLINE_ void lock() const {}
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_ALWAYS_INLINE_ void unlock() const {}
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_ALWAYS_INLINE_ Error try_lock() const { return OK; }
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};
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template <class MutexT>
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class MutexLock {
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public:
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explicit MutexLock(const MutexT &p_mutex) {}
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};
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#endif // !NO_THREADS
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using Mutex = MutexImpl<std::recursive_mutex>; // Recursive, for general use
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using BinaryMutex = MutexImpl<std::mutex>; // Non-recursive, handle with care
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extern template class MutexImpl<std::recursive_mutex>;
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extern template class MutexImpl<std::mutex>;
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extern template class MutexLock<MutexImpl<std::recursive_mutex> >;
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extern template class MutexLock<MutexImpl<std::mutex> >;
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#endif
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