DAT_EVD_SET_UNWAITABLE(3DAT) Direct Access Transport Library Functions

NAME

dat_evd_set_unwaitable - transition the Event Dispatcher into an
unwaitable state

SYNOPSIS

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

DAT_RETURN
dat_evd_set_unwaitable(
IN DAT_EVD_HANDLE evd_handle
)

PARAMETERS

evd_handle
Handle for an instance of Event Dispatcher.

DESCRIPTION

The dat_evd_set_unwaitable() transitions the Event Dispatcher into an
unwaitable state. In this state, calls to dat_evd_wait(3DAT) return
synchronously with a DAT_INVALID_STATE error, and threads already
blocked in dat_evd_wait() are awakened and return with a
DAT_INVALID_STATE error without any further action by the Consumer.
The actual state of the Event Dispatcher is accessible through
dat_evd_query(3DAT) and is DAT_EVD_UNWAITABLE after the return of
this operation.


This call does not affect a CNO associated with this EVD at all.
Events arriving on the EVD after it is set unwaitable still trigger
the CNO (if appropriate), and can be retrieved with
dat_evd_dequeue(3DAT). Because events can arrive normally on the EVD,
the EVD might overflow; the Consumer is expected to protect against
this possibility.

RETURN VALUES

DAT_SUCCESS
The operation was successful.


DAT_INVALID_HANDLE
The evd_handle parameter is invalid.

ATTRIBUTES

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


+--------------------+---------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+---------------------------+
|Interface Stability | Standard: uDAPL, 1.1, 1.2 |
+--------------------+---------------------------+
|MT-Level | Safe |
+--------------------+---------------------------+

SEE ALSO

dat_evd_clear_unwaitable(3DAT), dat_evd_dequeue(3DAT),
dat_evd_query(3DAT), dat_evd_wait(3DAT), libdat(3LIB), attributes(7)

July 16, 2004 DAT_EVD_SET_UNWAITABLE(3DAT)