man/man3dat/dat_evd_modify_cno.3dat

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 This manual page is derived from the DAT/uDAPL 1.2 specification.
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 When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
 dat_evd_modify_cno 3DAT "16 Jul 2004" "SunOS 5.11" "Direct Access Transport Library Functions"
 NAME
dat_evd_modify_cno - change the associated CNO for the Event Dispatcher
 SYNOPSIS

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

DAT_RETURN
 dat_evd_modify_cno (
 IN DAT_EVD_HANDLE evd_handle,
 IN DAT_CNO_HANDLE cno_handle
 )


 PARAMETERS

evd_handle

Handle for an instance of the Event Dispatcher.


cno_handle

Handle for a CNO. The value of DAT_NULL_HANDLE specifies no CNO.


 DESCRIPTION

The dat_evd_modify_cno() function changes the associated CNO for the
Event Dispatcher.

A Consumer can specify the value of DAT_HANDLE_NULL for cno_handle
to associate not CNO with the Event Dispatcher instance.

Upon completion of the dat_evd_modify_cno() operation, the passed IN new
CNO is used for notification. During the operation, an event arrival can be
delivered to the old or new CNO. If Notification is generated by EVD, it is
delivered to the new or old CNO.

If the EVD is enabled at the time dat_evd_modify_cno() is called, the
Consumer must be prepared to collect a notification event on the EVD's old CNO
as well as the new one. Checking immediately prior to calling
dat_evd_modify_cno() is not adequate. A notification could have been
generated after the prior check and before the completion of the change.

The Consumer can avoid the risk of missed notifications either by temporarily
disabling the EVD, or by checking the prior CNO after invoking this operation.
The Consumer can disable EVD before a dat_evd_modify_cno() call and
enable it afterwards. This ensures that any notifications from the EVD are
delivered to the new CNO only.

If this function is used to disassociate a CNO from the EVD, events arriving on
this EVD might cause waiters on that CNO to awaken after returning from this
routine because of unblocking a CNO waiter already "in progress" at the time
this routine is called. If this is the case, the events causing that unblocking
are present on the EVD upon return from the dat_evd_modify_cno() call and
can be dequeued at that time
 RETURN VALUES

DAT_SUCCESS

The operation was successful.


DAT_INVALID_HANDLE

Invalid DAT handle.


 ATTRIBUTES

See attributes(5) for descriptions of the following attributes:


ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityStandard: uDAPL, 1.1, 1.2
MT-LevelUnsafe


 SEE ALSO

libdat(3LIB), attributes(5)

ATTRIBUTE TYPE	ATTRIBUTE VALUE
Interface Stability	Standard: uDAPL, 1.1, 1.2
MT-Level	Unsafe