// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// See www.openfst.org for extensive documentation on this weighted
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// finite-state transducer library.
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//
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// Google-compatibility locking declarations and inline definitions.
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#ifndef FST_LIB_LOCK_H_
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#define FST_LIB_LOCK_H_
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#include <mutex>
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namespace fst {
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using namespace std;
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class Mutex {
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public:
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Mutex() {}
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inline void Lock() { mu_.lock(); }
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inline void Unlock() { mu_.unlock(); }
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private:
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std::mutex mu_;
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Mutex(const Mutex &) = delete;
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Mutex &operator=(const Mutex &) = delete;
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};
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class MutexLock {
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public:
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explicit MutexLock(Mutex *mu) : mu_(mu) { mu_->Lock(); }
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~MutexLock() { mu_->Unlock(); }
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private:
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Mutex *mu_;
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MutexLock(const MutexLock &) = delete;
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MutexLock &operator=(const MutexLock &) = delete;
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};
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// Currently, we don't use a separate reader lock.
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// TODO(kbg): Implement this with std::shared_mutex once C++17 becomes widely
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// available.
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using ReaderMutexLock = MutexLock;
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} // namespace fst
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#endif // FST_LIB_LOCK_H_
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