aio_suspend(3) - Linux manual page (original) (raw)

aiosuspend(3) Library Functions Manual aiosuspend(3)

NAME top

   aio_suspend - wait for asynchronous I/O operation or timeout

LIBRARY top

   Real-time library (_librt_, _-lrt_)

SYNOPSIS top

   **#include <aio.h>**

   **int aio_suspend(const struct aiocb *const** _aiocblist_**[], int** _n_**,**
                   **const struct timespec *restrict** _timeout_**);**

DESCRIPTION top

   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
      _aiocblist_ 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)](../man2/nanosleep.2.html).)

   The _n_ argument specifies the number of items in _aiocblist_.  Each
   item in the list pointed to by _aiocblist_ 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)](../man3/aio%5Fread.3.html), [aio_write(3)](../man3/aio%5Fwrite.3.html), or [lio_listio(3)](../man3/lio%5Flistio.3.html).  (See
   [aio(7)](../man7/aio.7.html) for a description of the _aiocb_ structure.)

   If **CLOCK_MONOTONIC** is supported, this clock is used to measure the
   timeout interval (see [clock_gettime(2)](../man2/clock%5Fgettime.2.html)).

RETURN VALUE top

   If this function returns after completion of one of the I/O
   requests specified in _aiocblist_, 0 is returned.  Otherwise, -1 is
   returned, and _[errno](../man3/errno.3.html)_ is set to indicate the error.

ERRORS top

   **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)](../man7/signal.7.html).

   **ENOSYS aio_suspend**() is not implemented.

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌──────────────────────────────────────┬───────────────┬─────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├──────────────────────────────────────┼───────────────┼─────────┤
   │ **aio_suspend**()                        │ Thread safety │ MT-Safe │
   └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

   POSIX.1-2008.

HISTORY top

   glibc 2.1.  POSIX.1-2001.

   POSIX doesn't specify the parameters to be _restrict_; that is
   specific to glibc.

NOTES top

   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
   _aiocblist_ 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)](../man3/aio%5Ferror.3.html) to scan the
   list of _aiocb_ structures pointed to by _aiocblist_.

BUGS top

   The glibc implementation of **aio_suspend**() is not async-signal-
   safe, in violation of the requirements of POSIX.1.

SEE ALSO top

   [aio_cancel(3)](../man3/aio%5Fcancel.3.html), [aio_error(3)](../man3/aio%5Ferror.3.html), [aio_fsync(3)](../man3/aio%5Ffsync.3.html), [aio_read(3)](../man3/aio%5Fread.3.html),
   [aio_return(3)](../man3/aio%5Freturn.3.html), [aio_write(3)](../man3/aio%5Fwrite.3.html), [lio_listio(3)](../man3/lio%5Flistio.3.html), [aio(7)](../man7/aio.7.html), [time(7)](../man7/time.7.html)

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   man-pages@man7.org

Linux man-pages 6.10 2024-11-17 aiosuspend(3)

Pages that refer to this page:aio_cancel(3), aiocb(3type), aio_error(3), aio_fsync(3), aio_read(3), aio_return(3), aio_write(3), lio_listio(3), aio(7), signal-safety(7)