RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-27 00:27:45 +00:00
Code Issues Activity Actions

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

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

25
Kernel/TTY.h
View file

@ -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;
};