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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); Link with -lrt.
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; /* 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 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.
VERSIONS
The aio_init() function is available since glibc 2.1.
CONFORMING TO
This function is a GNU extension.
SEE ALSO
aio(7)
COLOPHON
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