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Kernel: Share code between DoubleBuffer's read() and peek()
The only difference between these is whether the buffer index is advanced after the read.
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9387271049
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b820ae2828
Notes:
sideshowbarker
2024-07-18 00:53:56 +09:00
Author: https://github.com/awesomekling Commit: https://github.com/SerenityOS/serenity/commit/b820ae28283
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@ -60,40 +60,34 @@ ErrorOr<size_t> DoubleBuffer::write(const UserOrKernelBuffer& data, size_t size)
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return bytes_to_write;
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}
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ErrorOr<size_t> DoubleBuffer::read(UserOrKernelBuffer& data, size_t size)
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ErrorOr<size_t> DoubleBuffer::read_impl(UserOrKernelBuffer& data, size_t size, MutexLocker&, bool advance_buffer_index)
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{
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if (!size)
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if (size == 0)
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return 0;
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MutexLocker locker(m_lock);
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if (m_read_buffer_index >= m_read_buffer->size && m_write_buffer->size != 0)
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flip();
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if (m_read_buffer_index >= m_read_buffer->size)
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return 0;
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size_t nread = min(m_read_buffer->size - m_read_buffer_index, size);
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TRY(data.write(m_read_buffer->data + m_read_buffer_index, nread));
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m_read_buffer_index += nread;
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if (advance_buffer_index)
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m_read_buffer_index += nread;
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compute_lockfree_metadata();
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if (m_unblock_callback && m_space_for_writing > 0)
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m_unblock_callback();
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return nread;
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}
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ErrorOr<size_t> DoubleBuffer::read(UserOrKernelBuffer& data, size_t size)
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{
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MutexLocker locker(m_lock);
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return read_impl(data, size, locker, true);
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}
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ErrorOr<size_t> DoubleBuffer::peek(UserOrKernelBuffer& data, size_t size)
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{
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if (!size)
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return 0;
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MutexLocker locker(m_lock);
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if (m_read_buffer_index >= m_read_buffer->size && m_write_buffer->size != 0) {
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flip();
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}
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if (m_read_buffer_index >= m_read_buffer->size)
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return 0;
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size_t nread = min(m_read_buffer->size - m_read_buffer_index, size);
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TRY(data.write(m_read_buffer->data + m_read_buffer_index, nread));
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compute_lockfree_metadata();
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if (m_unblock_callback && m_space_for_writing > 0)
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m_unblock_callback();
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return nread;
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return read_impl(data, size, locker, false);
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}
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}
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@ -54,6 +54,8 @@ private:
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void flip();
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void compute_lockfree_metadata();
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ErrorOr<size_t> read_impl(UserOrKernelBuffer&, size_t, MutexLocker&, bool advance_buffer_index);
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struct InnerBuffer {
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u8* data { nullptr };
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size_t size;
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