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AIO_SUSPEND(P) AIO_SUSPEND(P)
NAME
aio_suspend - wait for an asynchronous I/O request (REALTIME)
SYNOPSIS
#include <aio.h>
int aio_suspend(const struct aiocb * const list[], int nent,
const struct timespec *timeout);
DESCRIPTION
The aio_suspend() function shall suspend the calling thread until at least one of
the asynchronous I/O operations referenced by the list argument has completed,
until a signal interrupts the function, or, if timeout is not NULL, until the time
interval specified by timeout has passed. If any of the aiocb structures in the
list correspond to completed asynchronous I/O operations (that is, the error status
for the operation is not equal to [EINPROGRESS]) at the time of the call, the func-
tion shall return without suspending the calling thread. The list argument is an
array of pointers to asynchronous I/O control blocks. The nent argument indicates
the number of elements in the array. Each aiocb structure pointed to has been used
in initiating an asynchronous I/O request via aio_read(), aio_write(), or lio_lis-
tio(). This array may contain NULL pointers, which are ignored. If this array con-
tains pointers that refer to aiocb structures that have not been used in submitting
asynchronous I/O, the effect is undefined.
If the time interval indicated in the timespec structure pointed to by timeout
passes before any of the I/O operations referenced by list are completed, then
aio_suspend() shall return with an error. If the Monotonic Clock option is sup-
ported, the clock that shall be used to measure this time interval shall be the
CLOCK_MONOTONIC clock.
RETURN VALUE
If the aio_suspend() function returns after one or more asynchronous I/O operations
have completed, the function shall return zero. Otherwise, the function shall
return a value of -1 and set errno to indicate the error.
The application may determine which asynchronous I/O completed by scanning the
associated error and return status using aio_error() and aio_return(), respec-
tively.
ERRORS
The aio_suspend() function shall fail if:
EAGAIN No asynchronous I/O indicated in the list referenced by list completed in
the time interval indicated by timeout.
EINTR A signal interrupted the aio_suspend() function. Note that, since each asyn-
chronous I/O operation may possibly provoke a signal when it completes, this
error return may be caused by the completion of one (or more) of the very
I/O operations being awaited.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
The aio_suspend() function is part of the Asynchronous Input and Output option and
need not be available on all implementations.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
aio_read() , aio_write() , lio_listio() , the Base Definitions volume of
IEEE Std 1003.1-2001, <aio.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std
1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating
System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C)
2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The
Open Group. In the event of any discrepancy between this version and the original
IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is
the referee document. The original Standard can be obtained online at
http://www.opengroup.org/unix/online.html .
POSIX 2003 AIO_SUSPEND(P)
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