/**
* This routine tells if an open ET system is alive (heartbeat is going).
*
* This routine behaves differently depending on whether it is run locally or remotely.
* If the user is running it locally, a thread of the user's process is constantly checking
* to see if the ET system is alive and provides a valid return value to et_alive when last
* it was monitored (up to three heartbeats ago). If the user is on a remote node, the ET
* system's server thread is contacted. If that communication succeeds, then the ET system
* is alive by definition, otherwise it is dead.
*
* @param id ET system id.
*
* @returns 1 if ET system is alive.
* @returns 0 if ET system is dead or bad arg.
*/
int et_alive(et_sys_id id) {
et_id *etid = (et_id *) id;
if (id == NULL) return 0;
if (etid->locality == ET_REMOTE) {
return etr_alive(id);
}
else if (etid->locality == ET_LOCAL_NOSHARE) {
return etn_alive(id);
}
return etl_alive(id);
}
int et_alive(et_sys_id id)
{
return etr_alive(id);
}