dat_evd_modify_cno(3DAT) Direct Access Transport Library Functions dat_evd_modify_cno(3DAT)
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 invok-
ing this operation. The Consumer can disable EVD before a dat_evd_modify_cno() call and enable it afterwards. This ensures that any notifi-
cations 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 TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard: uDAPL, 1.1, 1.2 |
+-----------------------------+-----------------------------+
|MT-Level |Unsafe |
+-----------------------------+-----------------------------+
SEE ALSO
libdat(3LIB), attributes(5)
SunOS 5.11 16 Jul 2004 dat_evd_modify_cno(3DAT)