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package ExclusiveLock::Guard; |
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6
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6
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280515
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use strict; |
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15
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6
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200
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3
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6
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6
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32
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use warnings; |
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6
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7
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6
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272
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4
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our $VERSION = '0.07'; |
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6
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6
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6
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931
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use Errno qw(EWOULDBLOCK); |
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6
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1356
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6
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809
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7
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6
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6
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31
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use Fcntl qw(LOCK_EX LOCK_NB LOCK_UN); |
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6
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6
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6
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268
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8
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6
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6
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5368
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use File::stat; |
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6
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46897
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6
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38
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9
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10
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my $ERRSTR; |
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0
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0
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0
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0
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sub errstr { $ERRSTR } |
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14
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sub new { |
15
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6
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6
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0
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3007996
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my($class, $filename, %args) = @_; |
16
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6
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50
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180
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my $retry_count = $args{retry_count} || 5; |
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18
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6
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45
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my $fh; |
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6
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46
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my $count = 0; |
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6
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26
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my $is_locked = 1; |
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6
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28
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while (1) { |
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6
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21
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$ERRSTR = undef; |
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6
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15
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$is_locked = 1; |
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6
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50
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938
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unless (open $fh, '>', $filename) { |
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0
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0
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$ERRSTR = "failed to open file:$filename:$!"; |
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0
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0
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return; |
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} |
28
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6
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100
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44
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if ($args{nonblocking}) { |
29
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2
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100
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43
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unless (flock $fh, LOCK_EX | LOCK_NB) { |
30
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1
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50
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17
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if ($! != EWOULDBLOCK) { |
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0
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0
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$ERRSTR = "failed to flock file:$filename:$!"; |
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0
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0
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return; |
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} |
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1
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4
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$is_locked = 0; |
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} |
36
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} else { |
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4
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50
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90
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unless (flock $fh, LOCK_EX) { |
38
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0
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0
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$ERRSTR = "failed to flock file:$filename:$!"; |
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0
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0
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return; |
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} |
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} |
42
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6
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50
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33
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326
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unless (-f $filename && stat($fh)->ino == do { my $s = stat($filename); $s ? $s->ino : -1 }) { |
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6
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50
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1823
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6
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759
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43
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0
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0
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0
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unless (flock $fh, LOCK_UN) { |
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0
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0
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$ERRSTR = "failed to unlock flock file:$filename:$!"; |
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0
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0
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return; |
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} |
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0
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0
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0
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unless (close $fh) { |
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0
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0
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$ERRSTR = "failed to close file:$filename:$!"; |
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0
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0
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return; |
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} |
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0
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0
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0
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0
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if ($retry_count && ++$count > $retry_count) { |
52
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0
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0
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$ERRSTR = "give up! $retry_count times retry to lock."; |
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0
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0
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return; |
54
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} |
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0
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0
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next; |
56
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} |
57
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6
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387
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last; |
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} |
59
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60
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bless { |
61
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6
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115
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filename => $filename, |
62
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fh => $fh, |
63
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is_locked => $is_locked, |
64
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}, $class; |
65
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} |
66
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67
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3
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3
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0
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38
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sub is_locked { $_[0]->{is_locked} } |
68
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69
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sub DESTROY { |
70
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6
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6
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2246328
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my $self = shift; |
71
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6
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100
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897
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return unless $self->{is_locked}; |
72
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73
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5
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112
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my $fh = delete $self->{fh}; |
74
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5
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75
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my $filename = delete $self->{filename}; |
75
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5
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50
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235
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unless (close $fh) { |
76
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0
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0
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warn "failed to close file:$filename:$!"; |
77
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0
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0
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return; |
78
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} |
79
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80
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# try unlink lock file |
81
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5
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50
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657
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if (open my $unlink_fh, '<', $filename) { # else is unlinked lock file by another process? |
82
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# A |
83
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5
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100
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509
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if (flock $unlink_fh, LOCK_EX | LOCK_NB) { # else is locked the file by another process |
84
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4
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50
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33
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351
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if (-f $filename && stat($unlink_fh)->ino == do { my $s = stat($filename); $s ? $s->ino : -1 }) { # else is unlink and create file by another process in the A timing |
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4
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50
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905
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4
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679
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85
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4
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50
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402
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unless (unlink $filename) { |
86
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0
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0
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warn "failed to unlink file:$filename:$!"; |
87
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} |
88
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4
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50
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56
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unless (flock $unlink_fh, LOCK_UN) { |
89
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0
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0
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warn "failed to unlock flock file:$filename:$!"; |
90
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} |
91
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4
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50
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279
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unless (close $unlink_fh) { |
92
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0
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warn "failed to close file:$filename:$!"; |
93
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} |
94
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} |
95
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} |
96
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} |
97
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} |
98
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99
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1; |
100
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__END__ |