NAME
aio_suspend() — wait for an asynchronous I/O operation to complete
SYNOPSIS
#include <aio.h>
int aio_suspend(const struct aiocb * const list[], int nent, const struct timespec *timeout);
DESCRIPTION
The
aio_suspend()
function suspends the calling process or thread until at
least one of the asynchronous I/O operations
initiated with one of the
nent
aiocb
pointers contained in
list
has completed, or a signal interrupts the function, or
timeout
is not
NULL
and the time interval specified by
timeout
has passed.
Multiple threads may issue simultaneous calls to
aio_suspend(),
referencing one or more
aiocbs
in common.
To use this function, link in the realtime library by specifying
-lrt
on the compiler or linker command line.
RETURN VALUE
aio_suspend()
returns the following values:
- 0
Successful completion.
Either there were no
non-NULL
aiocbs
in
list
or at least one of the asynchronous I/O operations
enqueued for an
aiocb
referenced by
list
has completed.
The completion status of the referenced asynchronous
I/O operations must be determined using
aio_error()
and
aio_return()
for each relevant
aiocb.
- -1
Failure.
The process thread is not suspended and
errno
is set to indicate the error.
If any of the indicated asynchronous I/O operations has already
completed at the time of the call to
aio_suspend(),
then
aio_suspend()
returns immediately.
If
nent
is 0 (zero), the
aio_suspend()
immediately returns success.
Any
NULL
aiocb
in
list
is silently ignored.
If all of the
aiocbs
in
list
are
NULL,
the
aio_suspend()
immediately returns success.
ERRORS
If
aio_suspend()
detects one of the following error conditions,
errno
is set to the indicated value:
- [EAGAIN]
System-wide or per-process resources were not available
to process the request.
- [EAGAIN]
The time interval specified in the
timespec
referenced by
timeout
passed before any of the asynchronous I/O operations
enqueued for one of the
aiocb
entries referenced in
list
completed.
- [EINVAL]
The value of the
nent
argument was negative or exceeded the
maximum value allowed. The maximum value
allowed can be obtained using the
sysconf()
call with the argument
_SC_AIO_MAX.
- [EINVAL]
One or more of the
aiocb
pointers in
list
does not identify an asynchronous operation
enqueued by
aio_read(),
aio_write(),
or
lio_listio(),
and for which
aio_return()
has not yet been called.
aiocb
pointers associated with
aio_fsync()
will yield this error.
- [EINTR]
A signal was delivered to the process while
aio_suspend()
was waiting.
Completion of asynchronous operations
can cause signal delivery.
STANDARDS CONFORMANCE
aio_suspend(): POSIX Realtime Extensions, IEEE Std 1003.1b
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