#!/usr/bin/perl

use File::Find;
use IO::File;

use strict;
use vars qw($Pat @Locks $DupOnly);

# This pattern matches the function names we are looking for
$Pat = qr/(?:NB)?Obtain(?:Write|Shared|)Lock|UpgradeSToWLock/;

if (@ARGV[0] eq '-d') {
  $DupOnly = 1;
  shift @ARGV;
}

find(
  sub {
    return unless -f $_;

    my $path = $File::Find::name;
    my $F = new IO::File($_, O_RDONLY) or die "$path: $!\n";
    while (<$F>) {
      next unless /\b(?:$Pat)\(.*,\s*(\d+)\)/o;
      $Locks[$1] ||= [];
      push(@{$Locks[$1]}, sprintf("%s:%d", $path, $.));
    }
    $F->close;
  }, @ARGV);

foreach my $id (0 .. @Locks) {
  next unless defined $Locks[$id];
  next if $DupOnly && @{$Locks[$id]} < 2;
  printf("%5d  %s", $id, join("       ", map("$_\n", @{$Locks[$id]})))
}