| // lock.h |
| // |
| // 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. |
| // |
| // Author: riley@google.com (Michael Riley) |
| // |
| // \file |
| // Google-compatibility locking declarations and inline definitions |
| |
| #ifndef FST_LIB_LOCK_H__ |
| #define FST_LIB_LOCK_H__ |
| |
| #include <fst/compat.h> // for DISALLOW_COPY_AND_ASSIGN |
| |
| namespace fst { |
| |
| using namespace std; |
| |
| // |
| // Single initialization - single-thread implementation |
| // |
| |
| typedef int FstOnceType; |
| |
| static const int FST_ONCE_INIT = 1; |
| |
| inline int FstOnceInit(FstOnceType *once, void (*init)(void)) { |
| if (*once) |
| (*init)(); |
| *once = 0; |
| return 0; |
| } |
| |
| // |
| // Thread locking - single-thread (non-)implementation |
| // |
| |
| class Mutex { |
| public: |
| Mutex() {} |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(Mutex); |
| }; |
| |
| class MutexLock { |
| public: |
| MutexLock(Mutex *) {} |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(MutexLock); |
| }; |
| |
| // Reference counting - single-thread implementation |
| class RefCounter { |
| public: |
| RefCounter() : count_(1) {} |
| |
| int count() const { return count_; } |
| int Incr() const { return ++count_; } |
| int Decr() const { return --count_; } |
| |
| private: |
| mutable int count_; |
| |
| DISALLOW_COPY_AND_ASSIGN(RefCounter); |
| }; |
| |
| } // namespace fst |
| |
| #endif // FST_LIB_LOCK_H__ |