mirror of https://github.com/facebook/rocksdb.git
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_NAMESPACE {
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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_NAMESPACE
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