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NAME | SYNOPSIS | DESCRIPTION | VERSIONS | CONFORMING TO | SEE ALSO | COLOPHON |
AIO_INIT(3) Linux Programmer's Manual AIO_INIT(3)
aio_init - asynchronous I/O initialization
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <aio.h>
void aio_init(const struct aioinit *init);
Link with -lrt.
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:
aio_threads
This field specifies the maximum number of worker threads that
may be used by the implementation. If the number of outstand‐
ing 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 termi‐
nating, after having completed a previous request. The
default value is 1.
The aio_init() function is available since glibc 2.1.
This function is a GNU extension.
aio(7)
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Linux 2020-08-13 AIO_INIT(3)
Pages that refer to this page: aio(7)
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