import quincy 17.2.0

[ceph.git] / ceph / src / arrow / cpp / src / plasma / plasma_allocator.h

// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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
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// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

#pragma once

#include <cstddef>
#include <cstdint>

namespace plasma {

class PlasmaAllocator {
 public:
  /// Allocates size bytes and returns a pointer to the allocated memory. The
  /// memory address will be a multiple of alignment, which must be a power of two.
  ///
  /// \param alignment Memory alignment.
  /// \param bytes Number of bytes.
  /// \return Pointer to allocated memory.
  static void* Memalign(size_t alignment, size_t bytes);

  /// Frees the memory space pointed to by mem, which must have been returned by
  /// a previous call to Memalign()
  ///
  /// \param mem Pointer to memory to free.
  /// \param bytes Number of bytes to be freed.
  static void Free(void* mem, size_t bytes);

  /// Sets the memory footprint limit for Plasma.
  ///
  /// \param bytes Plasma memory footprint limit in bytes.
  static void SetFootprintLimit(size_t bytes);

  /// Get the memory footprint limit for Plasma.
  ///
  /// \return Plasma memory footprint limit in bytes.
  static int64_t GetFootprintLimit();

  /// Get the number of bytes allocated by Plasma so far.
  /// \return Number of bytes allocated by Plasma so far.
  static int64_t Allocated();

 private:
  static int64_t allocated_;
  static int64_t footprint_limit_;
};

}  // namespace plasma