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