AIO_SUSPEND(P) POSIX Programmer's Manual AIO_SUSPEND(P)
aio_suspend - wait for an asynchronous I/O request (REALTIME)
int aio_suspend(const struct aiocb * const list, int nent,
const struct timespec *timeout);
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 function 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 struc-
ture pointed to has been used in initiating an asynchronous I/O request via aio_read(),
aio_write(), or lio_listio(). This array may contain NULL pointers, which are ignored. If
this array contains 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 supported, the clock that
shall be used to measure this time interval shall be the CLOCK_MONOTONIC clock.
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(), respectively.
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 asynchronous
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
The following sections are informative.
The aio_suspend() function is part of the Asynchronous Input and Output option and need
not be available on all implementations.
aio_read() , aio_write() , lio_listio() , the Base Definitions volume of
IEEE Std 1003.1-2001, <aio.h>
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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 AIO_SUSPEND(P)