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/*
* 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 _THRIFT_CONCURRENCY_MUTEX_H_
#define _THRIFT_CONCURRENCY_MUTEX_H_ 1
#include <memory>
#include <boost/noncopyable.hpp>
namespace apache {
namespace thrift {
namespace concurrency {
/**
* NOTE: All mutex implementations throw an exception on failure. See each
* specific implementation to understand the exception type(s) used.
*/
/**
* A simple mutex class
*
* @version $Id:$
*/
class Mutex {
public:
Mutex();
virtual ~Mutex() = default;
virtual void lock() const;
virtual bool trylock() const;
virtual bool timedlock(int64_t milliseconds) const;
virtual void unlock() const;
void* getUnderlyingImpl() const;
private:
class impl;
std::shared_ptr<impl> impl_;
};
class Guard : boost::noncopyable {
public:
Guard(const Mutex& value, int64_t timeout = 0) : mutex_(&value) {
if (timeout == 0) {
value.lock();
} else if (timeout < 0) {
if (!value.trylock()) {
mutex_ = nullptr;
}
} else {
if (!value.timedlock(timeout)) {
mutex_ = nullptr;
}
}
}
~Guard() {
if (mutex_) {
mutex_->unlock();
}
}
operator bool() const { return (mutex_ != nullptr); }
private:
const Mutex* mutex_;
};
}
}
} // apache::thrift::concurrency
#endif // #ifndef _THRIFT_CONCURRENCY_MUTEX_H_
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