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aio_waitn(3c)
aio_waitn(3C) Standard C Library Functions aio_waitn(3C)
NAME
aio_waitn - wait for completion of asynchronous I/O operations
SYNOPSIS
#include <aio.h>
int aio_waitn(struct aiocb *list[], uint_t nent,
uint_t *nwait, const struct timespec *timeout);
DESCRIPTION
The aio_waitn() function suspends the calling thread until at least the
number of requests specified by nwait have completed, until a signal
interrupts the function, or if timeout is not NULL, until the time in‐
terval specified by timeout has passed.
To effect a poll, the timeout argument should be non-zero, pointing to
a zero-valued timespec structure.
The list argument is an array of uninitialized I/O completion block
pointers to be filled in by the system before aio_waitn() returns. The
nent argument indicates the maximum number of elements that can be
placed in list[] and is limited to _AIO_LISTIO_MAX = 4096.
The nwait argument points to the minimum number of requests aio_waitn()
should wait for. Upon returning, the content of nwait is set to the ac‐
tual number of requests in the aiocb list, which can be greater than
the initial value specified in nwait. The aio_waitn() function attempts
to return as many requests as possible, up to the number of outstanding
asynchronous I/Os but less than or equal to the maximum specified by
the nent argument. As soon as the number of outstanding asynchronous
I/O requests becomes 0, aio_waitn() returns with the current list of
completed requests.
The aiocb structures returned will have been used in initiating an
asynchronous I/O request from any thread in the process with
aio_read(3C), aio_write(3C), or lio_listio(3C).
If the time interval expires before the expected number of I/O opera‐
tions specified by nwait are completed, aio_waitn() returns the number
of completed requests and the content of the nwait pointer is updated
with that number.
If aio_waitn() is interrupted by a signal, nwait is set to the number
of completed requests.
The application can determine the status of the completed asynchronous
I/O by checking the associated error and return status using aio_er‐
ror(3C) and aio_return(3C), respectively.
RETURN VALUES
Upon successful completion, aio_waitn() returns 0. Otherwise, it re‐
turns -1 and sets errno to indicate the error.
ERRORS
The aio_waitn() function will fail if:
EAGAIN There are no outstanding asynchronous I/O requests.
EFAULT The list[], nwait, or timeout argument points to an address
outside the address space of the process. The errno variable
is set to EFAULT only if this condition is detected by the
application process.
EINTR The execution of aio_waitn() was interrupted by a signal.
EINVAL The timeout element tv_sec or tv_nsec is < 0, nent is set to
0 or > _AIO_LISTIO_MAX, or nwait is either set to 0 or is >
nent.
ENOMEM There is currently not enough available memory. The applica‐
tion can try again later.
ETIME The time interval expired before nwait outstanding requests
have completed.
USAGE
The aio_waitn() function has a transitional interface for 64-bit file
offsets. See lf64(7).
ATTRIBUTES
See attributes(7) for descriptions of the following attributes:
tab() box; cw(2.75i) |cw(2.75i) lw(2.75i) |lw(2.75i) ATTRIBUTE TYPEAT‐
TRIBUTE VALUE _ Interface StabilityCommitted _ MT-LevelSafe
SEE ALSO
aio_return(3C), aio_error(3C), aio_read(3C), aio_write(3C), lio_lis‐
tio(3C), aio.h(3HEAD), attributes(7), lf64(7)
Oracle Solaris 11.4 18 Dec 2008 aio_waitn(3C)