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/*
*
* Copyright 2015 gRPC authors.
*
* 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.
*
*/
#ifndef GRPC_INTERNAL_CPP_DYNAMIC_THREAD_POOL_H
#define GRPC_INTERNAL_CPP_DYNAMIC_THREAD_POOL_H
#include <list>
#include <memory>
#include <queue>
#include <grpcpp/support/config.h>
#include "src/core/lib/gprpp/sync.h"
#include "src/core/lib/gprpp/thd.h"
#include "src/cpp/server/thread_pool_interface.h"
namespace grpc {
class DynamicThreadPool final : public ThreadPoolInterface {
public:
explicit DynamicThreadPool(int reserve_threads);
~DynamicThreadPool() override;
void Add(const std::function<void()>& callback) override;
private:
class DynamicThread {
public:
explicit DynamicThread(DynamicThreadPool* pool);
~DynamicThread();
private:
DynamicThreadPool* pool_;
grpc_core::Thread thd_;
void ThreadFunc();
};
grpc_core::Mutex mu_;
grpc_core::CondVar cv_;
grpc_core::CondVar 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 // GRPC_INTERNAL_CPP_DYNAMIC_THREAD_POOL_H
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