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); |
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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 3.52 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man−pages/.
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