chromium/base/memory/unsafe_shared_memory_pool.h

// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef BASE_MEMORY_UNSAFE_SHARED_MEMORY_POOL_H_
#define BASE_MEMORY_UNSAFE_SHARED_MEMORY_POOL_H_

#include <memory>
#include <utility>
#include <vector>

#include "base/base_export.h"
#include "base/memory/ref_counted.h"
#include "base/memory/unsafe_shared_memory_region.h"
#include "base/synchronization/lock.h"
#include "base/types/pass_key.h"

namespace base {

// UnsafeSharedMemoryPool manages allocation and pooling of
// UnsafeSharedMemoryRegions. Using pool saves cost of repeated shared memory
// allocations. Up-to 32 regions would be pooled. It is thread-safe. May return
// bigger regions than requested. If a requested size is increased, all stored
// regions are purged. Regions are returned to the buffer on destruction of
// |SharedMemoryHandle| if they are of a correct size.
class BASE_EXPORT UnsafeSharedMemoryPool
    : public RefCountedThreadSafe<UnsafeSharedMemoryPool> { … };

}  // namespace base

#endif  // BASE_MEMORY_UNSAFE_SHARED_MEMORY_POOL_H_