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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-24 04:52:22 +0000
commit3d08cd331c1adcf0d917392f7e527b3f00511748 (patch)
tree312f0d1e1632f48862f044b8bb87e602dcffb5f9 /man3/aio_init.3
parentAdding debian version 6.7-2. (diff)
downloadmanpages-3d08cd331c1adcf0d917392f7e527b3f00511748.tar.xz
manpages-3d08cd331c1adcf0d917392f7e527b3f00511748.zip
Merging upstream version 6.8.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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-.\" Copyright (c) 2010 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH aio_init 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-aio_init \- asynchronous I/O initialization
-.SH LIBRARY
-Real-time library
-.RI ( librt ", " \-lrt )
-.SH SYNOPSIS
-.nf
-.BR "#define _GNU_SOURCE" " /* See feature_test_macros(7) */"
-.B "#include <aio.h>"
-.P
-.BI "void aio_init(const struct aioinit *" init );
-.fi
-.SH DESCRIPTION
-The GNU-specific
-.BR 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.
-.P
-The tuning information is provided in the buffer pointed to by the argument
-.IR init .
-This buffer is a structure of the following form:
-.P
-.in +4n
-.EX
-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;
-};
-.EE
-.in
-.P
-The following fields are used in the
-.I aioinit
-structure:
-.TP
-.I aio_threads
-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.
-.TP
-.I aio_num
-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.
-.\" FIXME . But, if aio_num > 32, the behavior looks strange. See
-.\" http://sourceware.org/bugzilla/show_bug.cgi?id=12083
-The default value is 64.
-.TP
-.I aio_idle_time
-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.
-.SH STANDARDS
-GNU.
-.SH HISTORY
-glibc 2.1.
-.SH SEE ALSO
-.BR aio (7)