| // 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 IMPALA_UTIL_SPINLOCK_H |
| #define IMPALA_UTIL_SPINLOCK_H |
| |
| #include "gutil/spinlock.h" |
| #include "common/logging.h" |
| |
| namespace impala { |
| |
| // Wrapper around the Google SpinLock class to adapt it to the method names |
| // expected by Boost. |
| class SpinLock { |
| public: |
| SpinLock() {} |
| |
| /// Acquires the lock, spins and then blocks until the lock becomes available. |
| void lock() { |
| l_.Lock(); |
| } |
| |
| /// Releases the lock. |
| void unlock() { |
| l_.Unlock(); |
| } |
| |
| /// Tries to get the lock but does not spin or block. Returns true if the lock was |
| /// acquired, false otherwise. |
| bool try_lock() { |
| return l_.TryLock(); |
| } |
| |
| /// Verify that the lock is held. |
| void DCheckLocked() { DCHECK(l_.IsHeld()); } |
| |
| private: |
| /// The underlying SpinLock from gutil. |
| base::SpinLock l_; |
| |
| DISALLOW_COPY_AND_ASSIGN(SpinLock); |
| }; |
| |
| } |
| #endif |