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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef GRPCXX_DYNAMIC_THREAD_POOL_H
#define GRPCXX_DYNAMIC_THREAD_POOL_H
#include <grpc++/config.h>
#include <grpc++/impl/sync.h>
#include <grpc++/impl/thd.h>
#include <grpc++/thread_pool_interface.h>
#include <list>
#include <memory>
#include <queue>
namespace grpc {
class DynamicThreadPool GRPC_FINAL : public ThreadPoolInterface {
public:
explicit DynamicThreadPool(int reserve_threads);
~DynamicThreadPool();
void Add(const std::function<void()>& callback) GRPC_OVERRIDE;
private:
class DynamicThread {
public:
DynamicThread(DynamicThreadPool *pool);
~DynamicThread();
private:
DynamicThreadPool *pool_;
std::unique_ptr<grpc::thread> thd_;
void ThreadFunc();
};
grpc::mutex mu_;
grpc::condition_variable cv_;
grpc::condition_variable shutdown_cv_;
bool shutdown_;
std::queue<std::function<void()>> callbacks_;
int reserve_threads_;
int nthreads_;
int threads_waiting_;
std::list<DynamicThread*> dead_threads_;
void ThreadFunc();
static void ReapThreads(std::list<DynamicThread*>* tlist);
};
} // namespace grpc
#endif // GRPCXX_DYNAMIC_THREAD_POOL_H
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