| /** @file |
| |
| A brief file description |
| |
| @section license License |
| |
| 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. |
| */ |
| |
| #pragma once |
| |
| /*********************************************************************** |
| |
| Fast Mutex |
| |
| Uses atomic memory operations to minimize blocking. |
| |
| |
| ***********************************************************************/ |
| |
| #include "tscore/ink_defs.h" |
| #include "tscore/ink_error.h" |
| |
| #include <pthread.h> |
| #include <cstdlib> |
| typedef pthread_mutex_t ink_mutex; |
| |
| void ink_mutex_init(ink_mutex *m); |
| void ink_mutex_destroy(ink_mutex *m); |
| |
| static inline void |
| ink_mutex_acquire(ink_mutex *m) |
| { |
| int error = pthread_mutex_lock(m); |
| if (unlikely(error != 0)) { |
| ink_abort("pthread_mutex_lock(%p) failed: %s (%d)", m, strerror(error), error); |
| } |
| } |
| |
| static inline void |
| ink_mutex_release(ink_mutex *m) |
| { |
| int error = pthread_mutex_unlock(m); |
| if (unlikely(error != 0)) { |
| ink_abort("pthread_mutex_unlock(%p) failed: %s (%d)", m, strerror(error), error); |
| } |
| } |
| |
| static inline bool |
| ink_mutex_try_acquire(ink_mutex *m) |
| { |
| return pthread_mutex_trylock(m) == 0; |
| } |
| |
| /** RAII class for locking a @c ink_mutex. |
| |
| @code |
| ink_mutex m; |
| // ... |
| { |
| ink_mutex_scoped_lock lock(m); |
| // code under lock. |
| } |
| // code not under lock |
| @endcode |
| */ |
| class ink_scoped_mutex_lock |
| { |
| private: |
| ink_mutex &_m; |
| |
| public: |
| ink_scoped_mutex_lock(ink_mutex *m) : _m(*m) { ink_mutex_acquire(&_m); } |
| ink_scoped_mutex_lock(ink_mutex &m) : _m(m) { ink_mutex_acquire(&_m); } |
| ~ink_scoped_mutex_lock() { ink_mutex_release(&_m); } |
| }; |