select() returning busy for regular files [was Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait]

[Pavel Machek]

Hi!

> > Its arguing against making a smart application block on the disk while its
> > able to use the CPU for other work.
> 
> There are currently no other alternatives in user space. You'd have to
> create whole new interfaces for aio_read/write, and ways for the kernel to
> inform user space that "now you can re-try submitting your IO".

Why is current select() interface not good enough?

Defining that select may say regular file is not ready should be
enough. Okay, maybe you'd want new fcntl() flag saying "I _really_
want this regular file to be non-blocking". No need for new
interfaces.
                                                                Pavel
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