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  1. or download this
    #opens counter data file
open(COUNTERDAT,"./counter.dat");

#locks file, and if can't, goes back to READCOUNTER to try again
flock COUNTERDAT, 1 or next READCOUNTER;
  2. or download this
    #opens counter data file again
open(COUNTERDAT,">./counter.dat");

#locks file, and if can't, goes back to WRITECOUNTER
flock COUNTERDAT, 2 or next WRITECOUNTER;
  3. or download this
    open(COUNTERDAT,"./counter.dat");
flock COUNTERDAT, 1 or next READCOUNTER;