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 4.10 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/.



				  2017-03-13			AIO_SUSPEND(3)