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Implement a basic way for read() to block.

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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.
This commit is contained in:
Andreas Kling 2018-10-25 13:07:59 +02:00
parent ba56f4afde
commit c6f2890d8e
18 changed files with 86 additions and 17 deletions
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7
VirtualFileSystem/NullDevice.h
View file

@ -5,9 +5,10 @@
class NullDevice final : public CharacterDevice {
public:
NullDevice();
virtual ~NullDevice();
virtual ~NullDevice() override;
Unix::ssize_t read(byte* buffer, Unix::size_t bufferSize) override;
Unix::ssize_t write(const byte* buffer, Unix::size_t bufferSize) override;
virtual Unix::ssize_t read(byte* buffer, Unix::size_t bufferSize) override;
virtual Unix::ssize_t write(const byte* buffer, Unix::size_t bufferSize) override;
virtual bool hasDataAvailableForRead() const override;
};