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94 lines
2.8 KiB
C++
94 lines
2.8 KiB
C++
// Copyright 2018 The Chromium 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.
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#include "base/memory/writable_shared_memory_region.h"
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#include <utility>
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#include "base/memory/shared_memory.h"
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#include "build/build_config.h"
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namespace base {
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// static
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WritableSharedMemoryRegion WritableSharedMemoryRegion::Create(size_t size) {
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subtle::PlatformSharedMemoryRegion handle =
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subtle::PlatformSharedMemoryRegion::CreateWritable(size);
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return WritableSharedMemoryRegion(std::move(handle));
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}
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// static
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WritableSharedMemoryRegion WritableSharedMemoryRegion::Deserialize(
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subtle::PlatformSharedMemoryRegion handle) {
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return WritableSharedMemoryRegion(std::move(handle));
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}
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// static
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subtle::PlatformSharedMemoryRegion
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WritableSharedMemoryRegion::TakeHandleForSerialization(
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WritableSharedMemoryRegion region) {
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return std::move(region.handle_);
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}
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// static
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ReadOnlySharedMemoryRegion WritableSharedMemoryRegion::ConvertToReadOnly(
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WritableSharedMemoryRegion region) {
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subtle::PlatformSharedMemoryRegion handle = std::move(region.handle_);
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if (!handle.ConvertToReadOnly())
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return {};
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return ReadOnlySharedMemoryRegion::Deserialize(std::move(handle));
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}
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UnsafeSharedMemoryRegion WritableSharedMemoryRegion::ConvertToUnsafe(
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WritableSharedMemoryRegion region) {
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subtle::PlatformSharedMemoryRegion handle = std::move(region.handle_);
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if (!handle.ConvertToUnsafe())
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return {};
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return UnsafeSharedMemoryRegion::Deserialize(std::move(handle));
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}
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WritableSharedMemoryRegion::WritableSharedMemoryRegion() = default;
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WritableSharedMemoryRegion::WritableSharedMemoryRegion(
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WritableSharedMemoryRegion&& region) = default;
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WritableSharedMemoryRegion& WritableSharedMemoryRegion::operator=(
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WritableSharedMemoryRegion&& region) = default;
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WritableSharedMemoryRegion::~WritableSharedMemoryRegion() = default;
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WritableSharedMemoryMapping WritableSharedMemoryRegion::Map() const {
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return MapAt(0, handle_.GetSize());
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}
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WritableSharedMemoryMapping WritableSharedMemoryRegion::MapAt(
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off_t offset,
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size_t size) const {
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if (!IsValid())
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return {};
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void* memory = nullptr;
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size_t mapped_size = 0;
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if (!handle_.MapAt(offset, size, &memory, &mapped_size))
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return {};
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return WritableSharedMemoryMapping(memory, size, mapped_size,
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handle_.GetGUID());
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}
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bool WritableSharedMemoryRegion::IsValid() const {
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return handle_.IsValid();
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}
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WritableSharedMemoryRegion::WritableSharedMemoryRegion(
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subtle::PlatformSharedMemoryRegion handle)
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: handle_(std::move(handle)) {
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if (handle_.IsValid()) {
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CHECK_EQ(handle_.GetMode(),
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subtle::PlatformSharedMemoryRegion::Mode::kWritable);
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}
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}
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} // namespace base
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