- transition the Event Dispatcher into an unwaitable state
cc [ flag… ] file… -ldat [ library… ] #include <dat/udat.h> DAT_RETURN dat_evd_set_unwaitable( IN DAT_EVD_HANDLE evd_handle )
Handle for an instance of Event Dispatcher.
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.
The operation was successful.
The evd_handle parameter is invalid.
See attributes(5) for descriptions of the following attributes: