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chriskohlhoff / asio

Asio C++ Library
http://think-async.com/Asio
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windows/basic_console rough implementation. #1191

Open klemens-morgenstern opened 1 year ago

klemens-morgenstern commented 1 year ago

Hi Chris,

I got a very rough implementation for async IO on a console for windows. This would in the next step allow me to make a open_stdin function.

I can also add this to process, if you think it's not a fit for asio.

vinipsmaker commented 1 year ago

You might be interested in this: https://github.com/ghc/ghc/blob/ghc-8.2.1-release/libraries/base/cbits/inputReady.c#L114

I vaguely remember there were far too many quirks to deal with Windows' standard handles. For instance, whether you can cancel a read operation would depend on the type of the handle (and whether it was instantiated as IOCP... which cannot be modified later on). The only reliable way to cancel operations that I found out at the time I was dealing with Windows console was to create another thread to perform blocking IO and call CancelSynchronousIo(). In case you're interested: https://gitlab.com/emilua/emilua/-/blob/a166738c9f181ccce5dc6aaa92e0d2b14d141140/src/system.cpp#L181

Unfortunately I didn't save my notes so I don't have insights to share with you as all my research is now lost.