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Linux 2.6 - man page for aio_suspend (linux section 3)

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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 con-
       trol 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  opera-
	      tions we were waiting for); see signal(7).

       ENOSYS aio_suspend() is not implemented.

VERSIONS
       The aio_suspend() function is available since glibc 2.1.

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 com-
       pleted 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_sus-
       pend(), use aio_error(3) to scan the list of aiocb structures pointed to by aiocb_list.

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 3.55 of the Linux man-pages project.  A  description  of  the
       project,     and    information	  about    reporting	bugs,	 can	be    found    at
       http://www.kernel.org/doc/man-pages/.

					    2012-05-08				   AIO_SUSPEND(3)
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