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
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.
The
aio_suspend() function is available since glibc 2.1.
For an explanation of the terms used in this section, see
attributes(7).
| Interface |
Attribute |
Value |
| 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.
The glibc implementation of
aio_suspend() is not async-signal-safe, in
violation of the requirements of POSIX.1.
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)