Assure only 1 instance of PowerShell Script is Running at any given Time

Question

I am writing a batch script in PowerShell v1 that will get scheduled to run let\'s say once every minute. Inevitably, there will come a time when the job needs more than 1 m

Answer 1

Loading up an instance of Powershell is not trivial, and doing it every minute is going to impose a lot of overhead on the system. I'd just scedule one instance, and write the script to run in a process-sleep-process loop. Normally I'd uses a stopwatch timer, but I don't think they added those until V2.

$interval = 1
while ($true)
 {
  $now = get-date
  $next = (get-date).AddMinutes($interval)

  do-stuff

  if ((get-date) -lt $next)
    {
     start-sleep -Seconds (($next - (get-date)).Seconds)
    }
  }