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

aioinit(3) Library Functions Manual aioinit(3)

NAME top

   aio_init - asynchronous I/O initialization

LIBRARY top

   Real-time library (_librt_, _-lrt_)

SYNOPSIS top

   **#define _GNU_SOURCE** /* See feature_test_macros(7) */
   **#include <aio.h>**

   **void aio_init(const struct aioinit ***_init_**);**

DESCRIPTION top

   The GNU-specific **aio_init**() function allows the caller to provide
   tuning hints to the glibc POSIX AIO implementation.  Use of this
   function is optional, but to be effective, it must be called
   before employing any other functions in the POSIX AIO API.

   The tuning information is provided in the buffer pointed to by the
   argument _init_.  This buffer is a structure of the following form:

       struct aioinit {
           int aio_threads;    /* Maximum number of threads */
           int aio_num;        /* Number of expected simultaneous
                                  requests */
           int aio_locks;      /* Not used */
           int aio_usedba;     /* Not used */
           int aio_debug;      /* Not used */
           int aio_numusers;   /* Not used */
           int aio_idle_time;  /* Number of seconds before idle thread
                                  terminates (since glibc 2.2) */
           int aio_reserved;
       };

   The following fields are used in the _aioinit_ structure:

   _aiothreads_
          This field specifies the maximum number of worker threads
          that may be used by the implementation.  If the number of
          outstanding I/O operations exceeds this limit, then excess
          operations will be queued until a worker thread becomes
          free.  If this field is specified with a value less than 1,
          the value 1 is used.  The default value is 20.

   _aionum_
          This field should specify the maximum number of
          simultaneous I/O requests that the caller expects to
          enqueue.  If a value less than 32 is specified for this
          field, it is rounded up to 32.  The default value is 64.

   _aioidletime_
          This field specifies the amount of time in seconds that a
          worker thread should wait for further requests before
          terminating, after having completed a previous request.
          The default value is 1.

STANDARDS top

   GNU.

HISTORY top

   glibc 2.1.

SEE ALSO top

   [aio(7)](../man7/aio.7.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 aioinit(3)

Pages that refer to this page:aio(7)