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45 lines
1.6 KiB
C
45 lines
1.6 KiB
C
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// Copyright 2022 The Chromium Authors
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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.
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#ifndef BASE_MEMORY_SHARED_MEMORY_MAPPER_H_
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#define BASE_MEMORY_SHARED_MEMORY_MAPPER_H_
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#include "base/base_export.h"
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#include "base/containers/span.h"
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#include "base/memory/platform_shared_memory_handle.h"
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#include "third_party/abseil-cpp/absl/types/optional.h"
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#include <stdint.h>
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namespace base {
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// Interface to implement mapping and unmapping of shared memory regions into
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// the virtual address space. The default implementation,
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// |PlatformSharedMemoryMapper| uses the platform-specific APIs to map the
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// region anywhere in the address space. Other implementations can be used for
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// example to always map the regions into an existing address space reservation.
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// Implementations of this interface should generally be statically allocated
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// as SharedMemoryMappings keep a reference to their mapper.
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class BASE_EXPORT SharedMemoryMapper {
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public:
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// Returns the default shared memory mapper.
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static SharedMemoryMapper* GetDefaultInstance();
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// Maps the shared memory region identified through the provided platform
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// handle into the caller's address space.
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virtual absl::optional<span<uint8_t>> Map(
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subtle::PlatformSharedMemoryHandle handle,
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bool write_allowed,
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uint64_t offset,
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size_t size) = 0;
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// Unmaps the specified region of shared memory from the caller's address
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// space.
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virtual void Unmap(span<uint8_t> mapping) = 0;
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};
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} // namespace base
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#endif // BASE_MEMORY_SHARED_MEMORY_MAPPER_H_
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