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Diffstat (limited to 'upstream/opensuse-tumbleweed/man3/aio_init.3')
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diff --git a/upstream/opensuse-tumbleweed/man3/aio_init.3 b/upstream/opensuse-tumbleweed/man3/aio_init.3 new file mode 100644 index 00000000..4b97839d --- /dev/null +++ b/upstream/opensuse-tumbleweed/man3/aio_init.3 @@ -0,0 +1,78 @@ +.\" Copyright (c) 2010 by Michael Kerrisk <mtk.manpages@gmail.com> +.\" +.\" SPDX-License-Identifier: Linux-man-pages-copyleft +.\" +.TH aio_init 3 2023-03-30 "Linux man-pages 6.05.01" +.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>" +.PP +.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. +.PP +The tuning information is provided in the buffer pointed to by the argument +.IR init . +This buffer is a structure of the following form: +.PP +.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 +.PP +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) |