| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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 KUDU_BOOST_MUTEX_UTILS_H |
| #define KUDU_BOOST_MUTEX_UTILS_H |
| |
| |
| // Similar to std::lock_guard except that it takes |
| // a lock pointer, and checks against nullptr. If the |
| // pointer is NULL, does nothing. Otherwise guards |
| // with the lock. |
| template<class LockType> |
| class lock_guard_maybe { |
| public: |
| explicit lock_guard_maybe(LockType *l) : |
| lock_(l) { |
| if (l != nullptr) { |
| l->lock(); |
| } |
| } |
| |
| ~lock_guard_maybe() { |
| if (lock_ != nullptr) { |
| lock_->unlock(); |
| } |
| } |
| |
| private: |
| LockType *lock_; |
| }; |
| |
| #endif |