Re: [naviserver-devel] Upload Progress

[Stephen D. <sd...@gm...>]

On 1/2/06, Zoran Vasiljevic <zv...@ar...> wrote:
>
> Am 02.01.2006 um 08:36 schrieb Stephen Deasey:
>
> > On 12/31/05, Zoran Vasiljevic <zv...@ar...> wrote:
> >>
> >> Am 31.12.2005 um 20:12 schrieb Vlad Seryakov:
> >>
> >>> aio_read/aio_write system calls look like supported ubnder Linux
> >>>
> >>
> >> yes.  most of modern os's support some kind of kaio.
> >> I have checked solaris, linux and darwin and all do.
> >
> >
> > Hmm, not sure about that...
> >
> > Linux aio_read() is implemented within glibc with via threads.  The
> > 2.6 Linux epoll() is great for socket file descriptors, but doesn't
> > work with files.  Same for realtime signals in 2.4.  The kernel stuff,
> > io_submit() etc. only works on files opened with O_DIRECT, i.e. no
> > file system buffering. io_*() via libaio, and epoll() are not
> > portable.
> >
> > The BSDs (FreeBSD first, others later) have kqueue, and so does Mac/OS
> > from 10.3 on, but again this is not portable.  This didn't work with
> > threads in the past.  Don't know if/when that got fixed...
> >
> > Solaris 10 has some brand new port_*() calls. Again, not portable.
> > Not sure how aio_read() etc. are implemented on older versions of
> > Solaris.
> >
> > I think Windows has pretty good support for AIO, including to files.
> > Obviously, not portable.
>
> Look:
>
> On Darwin (10.4+)
>
> aio_cancel(2)            - cancel an outstanding asynchronous I/O
> operation (REALTIME)
> aio_error(2)             - retrieve error status of asynchronous I/O
> operation (REALTIME)
> aio_read(2)              - asynchronous read from a file (REALTIME)
> aio_return(2)            - retrieve return status of asynchronous I/O
> operation (REALTIME)
> aio_suspend(2)           - suspend until asynchronous I/O operations
> or timeout complete (REALTIME)
> aio_write(2)             - asynchronous write to a file (REALTIME)
>
> On Solaris:
>
> On Linux:
>
> aio_return (3)       - get return status of asynchronous I/O operation
> aio.h (0p)           - asynchronous input and output (REALTIME)
> aio_cancel (3)       - cancel an outstanding asynchronous I/O request
> aio_error (3p)       - retrieve errors status for an asynchronous I/O
> operation (REALTIME)
> aio_error (3)        - get error status of asynchronous I/O operation
> aio_suspend (3)      - wait for asynchronous I/O operation or timeout
> aio_read (3p)        - asynchronous read from a file (REALTIME)
> aio_return (3p)      - retrieve return status of an asynchronous I/O
> operation (REALTIME)
> aio_write (3p)       - asynchronous write to a file (REALTIME)
> aio_cancel (3p)      - cancel an asynchronous I/O request (REALTIME)
> aio_fsync (3)        - asynchronous file synchronization
> aio_fsync (3p)       - asynchronous file synchronization (REALTIME)
> aio_write (3)        - asynchronous write
> aio_suspend (3p)     - wait for an asynchronous I/O request (REALTIME)
> aio_read (3)         - asynchronous read
>
> On Solaris (2.8+)
>
> # apropos aio
> aio             aio (3head)     - asynchronous input and output
> aio_cancel      aio_cancel (3rt)    - cancel asynchronous I/O request
> aio_error       aio_error (3rt) - retrieve errors status for an
> asynchronous I/O operation
> aio_fsync       aio_fsync (3rt) - asynchronous file synchronization
> aio_read        aio_read (3rt)  - asynchronous read from a file
> aio_req         aio_req (9s)    - asynchronous I/O request structure
> aio_return      aio_return (3rt)    - retrieve return status of an
> asynchronous I/O operation
> aio_suspend     aio_suspend (3rt)   - wait for asynchronous I/O request
> aio_write       aio_write (3rt) - asynchronous write to a file
> aiocancel       aiocancel (3aio)    - cancel an asynchronous operation
> aioread         aioread (3aio)  - read or write asynchronous I/O
> operations
> aiowait         aiowait (3aio)  - wait for completion of asynchronous
> I/O operation
> aiowrite        aioread (3aio)  - read or write asynchronous I/O
> operations
> libaio          libaio (3lib)   - the asynchronous I/O library
>
> What we'd need is available on all above platforms:
>
>     aio_write
>     aio_cancel
>     aio_suspend
>
> So, what is the problem?


http://www.gnu.org/software/libc/manual/html_node/Configuration-of-AIO.html