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man:aio_suspend

AIO_SUSPEND(3) Linux Programmer's Manual AIO_SUSPEND(3)

NAME

     aio_suspend - wait for asynchronous I/O operation or timeout

SYNOPSIS

     #include <aio.h>
     int aio_suspend(const struct aiocb * const aiocb_list[],
                     int nitems, const struct timespec *timeout);
     Link with -lrt.

DESCRIPTION

     The aio_suspend() function suspends the calling thread until one of the
     following occurs:
  • One or more of the asynchronous I/O requests in the list aiocb_list

has completed.

  • A signal is delivered.
  • timeout is not NULL and the specified time interval has passed.

(For details of the timespec structure, see nanosleep(2).)

     The nitems argument specifies the number of items in aiocb_list.   Each
     item in the list pointed to by aiocb_list must be either NULL (and then
     is ignored), or a pointer to a control block on which I/O was initiated
     using  aio_read(3),  aio_write(3), or lio_listio(3).  (See aio(7) for a
     description of the aiocb structure.)
     If CLOCK_MONOTONIC is supported, this clock  is  used  to  measure  the
     timeout interval (see clock_gettime(3)).

RETURN VALUE

     If  this  function  returns after completion of one of the I/O requests
     specified in aiocb_list, 0 is returned.  Otherwise, -1 is returned, and
     errno is set to indicate the error.

ERRORS

     EAGAIN The  call  timed  out before any of the indicated operations had
            completed.
     EINTR  The call was ended by signal (possibly the completion signal  of
            one of the operations we were waiting for); see signal(7).
     ENOSYS aio_suspend() is not implemented.

VERSIONS

     The aio_suspend() function is available since glibc 2.1.

ATTRIBUTES

     For   an   explanation   of   the  terms  used  in  this  section,  see
     attributes(7).
     +--------------+---------------+---------+
     |Interface     | Attribute     | Value   |
     +--------------+---------------+---------+
     |aio_suspend() | Thread safety | MT-Safe |
     +--------------+---------------+---------+

CONFORMING TO

     POSIX.1-2001, POSIX.1-2008.

NOTES

     One can achieve polling by using a non-NULL timeout  that  specifies  a
     zero time interval.
     If  one  or  more  of  the  asynchronous  I/O  operations  specified in
     aiocb_list has already completed at the time of the  call  to  aio_sus-
     pend(), then the call returns immediately.
     To  determine  which  I/O  operations have completed after a successful
     return from aio_suspend(), use aio_error(3) to scan the list  of  aiocb
     structures pointed to by aiocb_list.

BUGS

     The  glibc implementation of aio_suspend() is not async-signal-safe, in
     violation of the requirements of POSIX.1.

SEE ALSO

     aio_cancel(3), aio_error(3), aio_fsync(3), aio_read(3),  aio_return(3),
     aio_write(3), lio_listio(3), aio(7), time(7)

COLOPHON

     This  page  is  part of release 4.16 of the Linux man-pages project.  A
     description of the project, information about reporting bugs,  and  the
     latest     version     of     this    page,    can    be    found    at
     https://www.kernel.org/doc/man-pages/.
                                2017-09-15                    AIO_SUSPEND(3)
/data/webs/external/dokuwiki/data/pages/man/aio_suspend.txt · Last modified: 2019/05/17 09:32 by 127.0.0.1

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