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Add a DoubleBuffer thingy to allow TTY read/write to be interleaved.

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I feel like this concept might be useful in more places. It's very naive
right now and uses dynamically growing buffers. It should really use static
size buffers and never kmalloc().
This commit is contained in:
Andreas Kling 2018-11-16 17:56:18 +01:00
parent 52d1822c3c
commit d2046e79cf
3 changed files with 63 additions and 12 deletions
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25
Kernel/TTY.h
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@ -5,6 +5,29 @@
class Process;
class DoubleBuffer {
public:
DoubleBuffer()
: m_write_buffer(&m_buffer1)
, m_read_buffer(&m_buffer2)
{
}
Unix::ssize_t write(const byte*, size_t);
Unix::ssize_t read(byte*, size_t);
bool is_empty() const { return m_read_buffer_index >= m_read_buffer->size() && m_write_buffer->isEmpty(); }
private:
void flip();
Vector<byte>* m_write_buffer { nullptr };
Vector<byte>* m_read_buffer { nullptr };
Vector<byte> m_buffer1;
Vector<byte> m_buffer2;
size_t m_read_buffer_index { 0 };
};
class TTY : public CharacterDevice {
public:
virtual ~TTY() override;
@ -35,7 +58,7 @@ protected:
void interrupt();
private:
Vector<byte> m_buffer;
DoubleBuffer m_buffer;
pid_t m_pgid { 0 };
Unix::termios m_termios;
};