| // Copyright 2023 The Dawn Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #ifndef SRC_DAWN_COMMON_MUTEX_H_ |
| #define SRC_DAWN_COMMON_MUTEX_H_ |
| |
| #include <atomic> |
| #include <mutex> |
| #include <thread> |
| #include <utility> |
| |
| #include "dawn/common/Assert.h" |
| #include "dawn/common/NonCopyable.h" |
| #include "dawn/common/Ref.h" |
| #include "dawn/common/RefCounted.h" |
| |
| namespace dawn { |
| class Mutex : public RefCounted, NonCopyable { |
| public: |
| template <typename MutexRef> |
| struct AutoLockBase : NonMovable { |
| AutoLockBase() : mMutex(nullptr) {} |
| explicit AutoLockBase(MutexRef mutex) : mMutex(std::move(mutex)) { |
| if (mMutex != nullptr) { |
| mMutex->Lock(); |
| } |
| } |
| ~AutoLockBase() { |
| if (mMutex != nullptr) { |
| mMutex->Unlock(); |
| } |
| } |
| |
| private: |
| MutexRef mMutex; |
| }; |
| |
| // This scoped lock won't keep the mutex alive. |
| using AutoLock = AutoLockBase<Mutex*>; |
| // This scoped lock will keep the mutex alive until out of scope. |
| using AutoLockAndHoldRef = AutoLockBase<Ref<Mutex>>; |
| |
| ~Mutex() override; |
| |
| void Lock(); |
| void Unlock(); |
| |
| // This method is only enabled when DAWN_ENABLE_ASSERTS is turned on. |
| // Thus it should only be wrapped inside DAWN_ASSERT() macro. |
| // i.e. DAWN_ASSERT(mutex.IsLockedByCurrentThread()) |
| bool IsLockedByCurrentThread(); |
| |
| private: |
| #if defined(DAWN_ENABLE_ASSERTS) |
| std::atomic<std::thread::id> mOwner; |
| #endif // DAWN_ENABLE_ASSERTS |
| std::mutex mNativeMutex; |
| }; |
| |
| } // namespace dawn |
| |
| #endif |