code: func newExecWorker(probeCmd, probePath string, execPeriod time.Duration, exec utilexec.Interface, clock clock.Clock, readyCh chan<- struct{}) *execWorker {
  	return &execWorker{
  		// Initializing the result with a timestamp here allows us to
  		// wait maxLatency for the worker goroutine to start, and for each
  		// iteration of the worker to complete.
  		exec:      exec,
  		clock:     clock,
  		result:    execResult{[]byte{}, nil, clock.Now()},
  		period:    execPeriod,
  		probeCmd:  probeCmd,
  		probePath: probePath,
  		stopCh:    make(chan struct{}),
  		readyCh:   readyCh,
  	}
  }
docs: // newExecWorker is a constructor for execWorker.