| // 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. |
| |
| #include "dawn/common/WeakRefSupport.h" |
| |
| #include <utility> |
| |
| namespace dawn::detail { |
| |
| WeakRefData::WeakRefData(RefCounted* value) : mValue(value) {} |
| |
| Ref<RefCounted> WeakRefData::TryGetRef() { |
| std::lock_guard<std::mutex> lock(mMutex); |
| if (!mValue || !mValue->mRefCount.TryIncrement()) { |
| return nullptr; |
| } |
| return AcquireRef(mValue); |
| } |
| |
| RefCounted* WeakRefData::UnsafeGet() const { |
| return mValue; |
| } |
| |
| void WeakRefData::Invalidate() { |
| std::lock_guard<std::mutex> lock(mMutex); |
| mValue = nullptr; |
| } |
| |
| WeakRefSupportBase::WeakRefSupportBase(Ref<detail::WeakRefData> data) : mData(std::move(data)) {} |
| |
| WeakRefSupportBase::~WeakRefSupportBase() { |
| mData->Invalidate(); |
| } |
| |
| } // namespace dawn::detail |