Name
aio_init — asynchronous I/O initialization
Synopsis
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <aio.h>
void
aio_init( |
const struct aioinit *init); |
![[Note]](../stylesheet/note.png) |
Note |
|---|---|
|
Link with |
DESCRIPTION
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;int aio_num;
requests */int aio_locks;int aio_usedba;int aio_debug;int aio_numusers;int aio_idle_time;
terminates (since glibc 2.2) */int aio_reserved;};
The following fields are used in the aioinit structure:
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.
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. The default value is 64.
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.
COLOPHON
This page is part of release 5.11 of the Linux man-pages project. A
description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man−pages/.
|
Copyright (c) 2010 by Michael Kerrisk <mtk.manpagesgmail.com> %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. %%%LICENSE_END |