mirror of https://github.com/facebook/rocksdb.git
69 lines
2.0 KiB
C++
69 lines
2.0 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under both the GPLv2 (found in the
|
|
// COPYING file in the root directory) and Apache 2.0 License
|
|
// (found in the LICENSE.Apache file in the root directory).
|
|
//
|
|
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style license that can be
|
|
// found in the LICENSE file. See the AUTHORS file for names of contributors.
|
|
|
|
#pragma once
|
|
#include <atomic>
|
|
#include <memory>
|
|
|
|
#include "rocksdb/env.h"
|
|
#include "rocksdb/concurrent_task_limiter.h"
|
|
|
|
namespace rocksdb {
|
|
|
|
class TaskLimiterToken;
|
|
|
|
class ConcurrentTaskLimiterImpl : public ConcurrentTaskLimiter {
|
|
public:
|
|
explicit ConcurrentTaskLimiterImpl(const std::string& name,
|
|
int32_t max_outstanding_task);
|
|
|
|
virtual ~ConcurrentTaskLimiterImpl();
|
|
|
|
virtual const std::string& GetName() const override;
|
|
|
|
virtual void SetMaxOutstandingTask(int32_t limit) override;
|
|
|
|
virtual void ResetMaxOutstandingTask() override;
|
|
|
|
virtual int32_t GetOutstandingTask() const override;
|
|
|
|
// Request token for adding a new task.
|
|
// If force == true, it requests a token bypassing throttle.
|
|
// Returns nullptr if it got throttled.
|
|
virtual std::unique_ptr<TaskLimiterToken> GetToken(bool force);
|
|
|
|
private:
|
|
friend class TaskLimiterToken;
|
|
|
|
std::string name_;
|
|
std::atomic<int32_t> max_outstanding_tasks_;
|
|
std::atomic<int32_t> outstanding_tasks_;
|
|
|
|
// No copying allowed
|
|
ConcurrentTaskLimiterImpl(const ConcurrentTaskLimiterImpl&) = delete;
|
|
ConcurrentTaskLimiterImpl& operator=(
|
|
const ConcurrentTaskLimiterImpl&) = delete;
|
|
};
|
|
|
|
class TaskLimiterToken {
|
|
public:
|
|
explicit TaskLimiterToken(ConcurrentTaskLimiterImpl* limiter)
|
|
: limiter_(limiter) {}
|
|
~TaskLimiterToken();
|
|
|
|
private:
|
|
ConcurrentTaskLimiterImpl* limiter_;
|
|
|
|
// no copying allowed
|
|
TaskLimiterToken(const TaskLimiterToken&) = delete;
|
|
void operator=(const TaskLimiterToken&) = delete;
|
|
};
|
|
|
|
} // namespace rocksdb
|