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4ad9543a65
This will allow sharing e.g. document cookie versions between the UI and WebContent processes, and safely accessing those versions. Core::AnonymousBuffer internally creates a minimum buffer of PAGE_SIZE bytes. This is much more than the size of a single version, but this affords us the opportunity to share multiple versions in a single buffer between processes. With a PAGE_SIZE of 4096, we can share up to 512 versions in a single buffer.
49 lines
1.6 KiB
C++
49 lines
1.6 KiB
C++
/*
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* Copyright (c) 2026, Tim Flynn <trflynn89@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Platform.h>
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#include <LibCore/SharedVersion.h>
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namespace Core {
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static size_t SHARED_VERSION_BUFFER_SIZE = PAGE_SIZE;
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static size_t SHARED_VERSION_BUFFER_COUNT = SHARED_VERSION_BUFFER_SIZE / sizeof(SharedVersion);
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AnonymousBuffer create_shared_version_buffer()
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{
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return MUST(AnonymousBuffer::create_with_size(SHARED_VERSION_BUFFER_SIZE));
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}
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bool initialize_shared_version(AnonymousBuffer& shared_version_buffer, SharedVersionIndex shared_version_index)
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{
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if (!shared_version_buffer.is_valid() || shared_version_index >= SHARED_VERSION_BUFFER_COUNT)
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return false;
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auto* shared_versions = shared_version_buffer.data<SharedVersion>();
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shared_versions[shared_version_index] = INITIAL_SHARED_VERSION;
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return true;
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}
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void increment_shared_version(AnonymousBuffer& shared_version_buffer, SharedVersionIndex shared_version_index)
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{
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if (!shared_version_buffer.is_valid() || shared_version_index >= SHARED_VERSION_BUFFER_COUNT)
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return;
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auto* shared_versions = shared_version_buffer.data<SharedVersion>();
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++shared_versions[shared_version_index];
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}
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Optional<SharedVersion> get_shared_version(AnonymousBuffer const& shared_version_buffer, SharedVersionIndex shared_version_index)
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{
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if (!shared_version_buffer.is_valid() || shared_version_index >= SHARED_VERSION_BUFFER_COUNT)
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return {};
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auto const* shared_versions = shared_version_buffer.data<SharedVersion>();
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return shared_versions[shared_version_index];
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}
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}
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