| #pragma once |
| |
| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * 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 "common/vsoc/shm/lock.h" |
| |
| namespace vsoc { |
| |
| class RegionView; |
| |
| /* |
| * Implements std::lock_guard like functionality for the vsoc locks. |
| */ |
| |
| template <typename Lock> |
| class LockGuard { |
| public: |
| explicit LockGuard(Lock* lock) : lock_(lock) { |
| lock_->Lock(); |
| } |
| |
| LockGuard(LockGuard&& o) noexcept { |
| lock_ = o.lock_; |
| o.lock_ = nullptr; |
| } |
| |
| LockGuard(const LockGuard&) = delete; |
| LockGuard& operator=(const LockGuard&) = delete; |
| |
| ~LockGuard() { |
| if (lock_) { |
| lock_->Unlock(); |
| } |
| } |
| |
| private: |
| Lock* lock_; |
| }; |
| |
| template <> |
| class LockGuard<::vsoc::layout::GuestAndHostLock> { |
| using Lock = ::vsoc::layout::GuestAndHostLock; |
| |
| public: |
| LockGuard(Lock* lock, RegionView* region) : lock_(lock), region_(region) { |
| lock_->Lock(region_); |
| } |
| |
| LockGuard(LockGuard&& o) noexcept { |
| lock_ = o.lock_; |
| o.lock_ = nullptr; |
| region_ = o.region_; |
| o.region_ = nullptr; |
| } |
| |
| LockGuard(const LockGuard&) = delete; |
| LockGuard& operator=(const LockGuard&) = delete; |
| |
| ~LockGuard() { |
| if (lock_) { |
| lock_->Unlock(region_); |
| } |
| } |
| |
| private: |
| Lock* lock_; |
| RegionView* region_; |
| }; |
| |
| } // namespace vsoc |