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c6f2890d8e
FileHandle gets a hasDataAvailableForRead() getter. If this returns true in sys$read(), the task will block(BlockedRead) + yield. The fd blocked on is stored in Task::m_fdBlockedOnRead. The scheduler then looks at the state of that fd during the unblock phase. This makes "sh" restful. :^) There's still some problem with the kernel not surviving the colonel task getting scheduled. I need to figure that out and fix it.
29 lines
637 B
C++
29 lines
637 B
C++
#pragma once
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#include <VirtualFileSystem/CharacterDevice.h>
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class Console final : public CharacterDevice {
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public:
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static Console& the();
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Console();
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virtual ~Console() override;
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virtual bool hasDataAvailableForRead() const override;
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virtual ssize_t read(byte* buffer, size_t size) override;
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virtual ssize_t write(const byte* data, size_t size) override;
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void putChar(char);
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private:
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const byte m_rows { 25 };
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const byte m_columns { 80 };
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byte m_cursorRow { 0 };
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byte m_cursorColumn { 0 };
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byte m_currentAttribute { 0x07 };
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const byte* s_vgaMemory { (const byte*)0xb8000 };
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};
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