9eb3e1f77d
Summary: Use delete to disable automatic generated methods instead of private, and put the constructor together for more clear.This modification cause the unused field warning, so add unused attribute to disable this warning. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5009 Differential Revision: D17288733 fbshipit-source-id: 8a767ce096f185f1db01bd28fc88fef1cdd921f3
58 lines
1.7 KiB
C++
58 lines
1.7 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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//
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// Abstract interface for allocating memory in blocks. This memory is freed
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// when the allocator object is destroyed. See the Arena class for more info.
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#pragma once
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#include <cerrno>
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#include <cstddef>
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#include "rocksdb/write_buffer_manager.h"
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namespace rocksdb {
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class Logger;
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class Allocator {
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public:
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virtual ~Allocator() {}
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virtual char* Allocate(size_t bytes) = 0;
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virtual char* AllocateAligned(size_t bytes, size_t huge_page_size = 0,
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Logger* logger = nullptr) = 0;
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virtual size_t BlockSize() const = 0;
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};
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class AllocTracker {
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public:
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explicit AllocTracker(WriteBufferManager* write_buffer_manager);
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// No copying allowed
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AllocTracker(const AllocTracker&) = delete;
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void operator=(const AllocTracker&) = delete;
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~AllocTracker();
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void Allocate(size_t bytes);
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// Call when we're finished allocating memory so we can free it from
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// the write buffer's limit.
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void DoneAllocating();
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void FreeMem();
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bool is_freed() const { return write_buffer_manager_ == nullptr || freed_; }
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private:
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WriteBufferManager* write_buffer_manager_;
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std::atomic<size_t> bytes_allocated_;
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bool done_allocating_;
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bool freed_;
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};
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} // namespace rocksdb
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