man/man3dat/dat_srq_set_lw.3dat

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 DAT_SRQ_SET_LW 3DAT "Jul 16, 2004"
 NAME
dat_srq_set_lw - set low watermark on shared receive queue
 SYNOPSIS

cc [ flag.\|.\|. ] file.\|.\|. -ldat [ library.\|.\|. ]
#include <dat/udat.h>

DAT_RETURN
 dat_srq_set_lw (
 IN DAT_SRQ_HANDLE srq_handle,
 IN DAT_COUNT low_watermark
 )


 PARAMETERS
srq_handle

A handle for an instance of a Shared Receive Queue.


low_watermark

The low watermark for the number of Recv buffers on SRQ.


 DESCRIPTION

The dat_srq_set_lw() function sets the low watermark value for the SRQ
and arms the SRQ for generating an asynchronous event for the low watermark. An
asynchronous event will be generated when the number of buffers on the SRQ is
below the low watermark for the first time. This can occur during the current
call or when an associated EP takes a buffer from the SRQ.

The asynchronous event will be generated only once per setting of the low
watermark. Once an event is generated, no new asynchronous events for the
number of buffers inthe SRQ below the specified value will be generated until
the SRQ is again set for the Low Watermark. If the Consumer is again interested
in the event, the Consumer should set the low watermark again.
 RETURN VALUES
DAT_SUCCESS

The operation was successful.


DAT_INVALID_HANDLE

The srq_handle argument is an invalid DAT handle.


DAT_INVALID_PARAMETER

Invalid parameter; the value of low_watermark is exceeds the value of
max_recv_dtos.


DAT_MODEL_NOT_SUPPORTED

The requested Model was not supported by the Provider. The Provider does not
support SRQ Low Watermark.


 USAGE

Upon receiving the asynchronous event for the SRQ low watermark, the Consumer
can replenish Recv buffers on the SRQ or take any other action that is
appropriate.

Regardless of whether an asynchronous event for the low watermark has been
generated, this operation will set the generation of an asynchronous event with
the Consumer-provided low watermark value. If the new low watermark value is
below the current number of free Receive DTOs posted to the SRQ, an
asynchronous event will be generated immediately. Otherwise the old low
watermark value is simply replaced with the new one.
 ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


ATTRIBUTE TYPE ATTRIBUTE VALUE
Interface Stability Standard: uDAPL, 1.2
MT-Level Unsafe


 SEE ALSO

 dat_srq_create (3DAT),  dat_srq_free (3DAT),  dat_srq_post_recv (3DAT),  dat_srq_query (3DAT),  dat_srq_resize (3DAT),  libdat (3LIB),  attributes (7)