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dat_srq_set_lw(3dat) [opensolaris man page]

dat_srq_set_lw(3DAT)				     Direct Access Transport Library Functions				      dat_srq_set_lw(3DAT)

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 asyn- chronous 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(5) 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(5) SunOS 5.11 16 Jul 2004 dat_srq_set_lw(3DAT)

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dat_ep_set_watermark(3DAT)			     Direct Access Transport Library Functions				dat_ep_set_watermark(3DAT)

NAME
dat_ep_set_watermark - set high watermark on Endpoint SYNOPSIS
cc [ flag... ] file... -ldat [ library... ] #include <dat/udat.h> DAT_RETURN dat_ep_set_watermark ( IN DAT_EP_HANDLE ep_handle, IN DAT_COUNT soft_high_watermark, IN DAT_COUNT hard_high_watermark ) PARAMETERS
ep_handle The handle for an instance of an Endpoint. soft_high_watermark The soft high watermark for the number of Recv buffers consumed by the Endpoint. hard_high_watermark The hard high watermark for the number of Recv buffers consumed by the Endpoint. DESCRIPTION
The dat_ep_set_watermark() function sets the soft and hard high watermark values for EP and arms EP for generating asynchronous events for high watermarks. An asynchronous event will be generated for IA async_evd when the number of Recv buffers at EP exceeds the soft high watermark for the first time. A connection broken event will be generated for EP connect_evd when the number of Recv buffers at EP exceeds the hard high watermark. These can occur during this call or when EP takes a buffer from the SRQ or EP RQ. The soft and hard high watermark asynchronous event generation and setting are independent of each other. The asynchronous event for a soft high watermark is generated only once per setting. Once an event is generated, no new asynchronous events for the soft high watermark is generated until the EP is again set for the soft high watermark. If the Consumer is once again interested in the event, the Consumer should again set the soft high watermark. If the Consumer is not interested in a soft or hard high watermark, the value of DAT_WATERMARK_INFINITE can be specified for the case that is the default value. This value specifies that a non-asynchronous event will be generated for a high watermark EP attribute for which this value is set. It does not prevent generation of a connection broken event for EP when no Recv buffer is available for a message arrived on the EP connection. The operation is supported for all states of Endpoint. RETURN VALUES
DAT_SUCCESS The operation was successful. DAT_INVALID_HANDLE The ep_handle argument is an invalid DAT handle. DAT_INVALID_PARAMETER One of the parameters is invalid. DAT_MODEL_NOT_SUPPORTED The requested Model was not supported by the Provider. The Provider does not support EP Soft or Hard High Watermarks. USAGE
For a hard high watermark, the Provider is ready to generate a connection broken event as soon as the connection is established. If the asynchronous event for a soft or hard high watermark has not yet been generated, this call simply modifies the values for these attributes. The Provider remains armed for generation of these asynchronous events. Regardless of whether an asynchronous event for the soft and hard high watermark has been generated, this operation will set the generation of an asynchronous event with the Consumer-provided high watermark values. If the new high watermark values are below the current number of Receive DTOs at EP, an asynchronous event will be generated immediately. Otherwise the old soft or hard (or both) high watermark values are simply replaced with the new ones. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard: uDAPL, 1.2 | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
dat_ep_create(3DAT), dat_ep_recv_query(3DAT), dat_srq_create(3DAT), dat_srq_free(3DAT), dat_srq_post_recv(3DAT), dat_srq_query(3DAT), dat_srq_resize(3DAT), dat_srq_set_lw(3DAT), libdat(3LIB), attributes(5) SunOS 5.10 16 Jul 2004 dat_ep_set_watermark(3DAT)
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