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       aio_suspend - wait for asynchronous I/O operation or timeout


       #include <aio.h>

       int aio_suspend(const struct aiocb * const aiocb_list[],
                       int nitems, const struct timespec *timeout);

       Link with -lrt.


       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)).


       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.


       EAGAIN The  call  timed  out before any of the indicated operations had

       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.


       The aio_suspend() function is available since glibc 2.1.


       For   an   explanation   of   the  terms  used  in  this  section,  see

       │InterfaceAttributeValue   │
       │aio_suspend() │ Thread safety │ MT-Safe │


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


       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_suspend(), 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.


       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)


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                                  2015-03-02                    AIO_SUSPEND(3)