[Bug librt/20950] Do asynchronous execution for lio_listio's IOs

[fweimer at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=20950

--- Comment #3 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Ulrich Windl from comment #2)
> (In reply to Florian Weimer from comment #1)
> > Out of curiosity, is there a reason why you cannot use libaio instead of the
> > glibc aio interface?  Thanks.
> 
> Two reasons:
> 1) It (lio_listio()) is POSIX, so it may run on several machines.
> 2) I didn't know that there are two implementations ;-)

Ah.  I was asking because it is not likely that we will make further changes to
the thread-based aio implementation in glibc.

I'm not sure if Linux actually offers truly asynchronous buffered I/O.  Some
thread is needed to drive the I/O.  But glibc (or any other aio implementation)
cannot spawn a separate thread for each I/O operation in the list because that
could lead to I/O thrashing.

I'm sorry but I think we should close this bug as WONTFIX.

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