See when process exits in Windows XP

[Brad Tilley]

I've tested this function out and it works well... it'll loop until 
ntbackup.exe has exited and then the script goes on to rename the 
backup.bkf file and copy it to a file server. Having _never_ done this 
before I thought it'd be wise to run this by comp.lang.python. I know 
it's a simple and stupid way in which to monitor a process, but it works 
for me... is it safe to do this? I don't want to get too complex. 
Thanks, Brad

def wait_for_ntbackup_to_exit(procname):
     while True:
         try:
             pids = win32pdhutil.FindPerformanceAttributesByName(procname)
             if len(pids) > 0:
                 print pids
                 print len(pids)
                 print "ntbackup is running... waiting for it to exit."
                 continue
         except:
             return