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Implement a basic way for read() to block.
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.
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18 changed files with 86 additions and 17 deletions
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@ -18,6 +18,7 @@ private:
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// ^CharacterDevice
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virtual ssize_t read(byte* buffer, size_t) override;
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virtual ssize_t write(const byte* buffer, size_t) override;
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virtual bool hasDataAvailableForRead() const override;
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CircularQueue<byte, 16> m_queue;
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byte m_modifiers { 0 };
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