úÎDºSafe A heartbeatAutomatically calls  and  as needed4Create a new pulse that will send a heartbeat every  seconds)Destroy the pulse. Note that all pending  will be left blocked3Block until the next heartbeat is triggered on the         $pulse-0.1.0.0-9ME3j2iq7ClG4oDS04dLshControl.Concurrent.PulsePulse withPulsenewPulse destroyPulse waitForPulse time-1.6.0.1Data.Time.Clock.ScaleDiffTimep_worker p_pending pulseWorker