line |
stmt |
bran |
cond |
sub |
pod |
time |
code |
1
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package DBIx::TxnPool; |
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3
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1
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46438
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use strict; |
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3
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1
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42
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4
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1
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5
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use warnings; |
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2
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1
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36
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5
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1
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1
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6
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use Exporter 5.57 qw( import ); |
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50
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1
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42
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6
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7
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1
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1
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1042
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use Try::Tiny; |
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1715
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1
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72
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8
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1
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1
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979
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use Signal::Mask; |
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1
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33583
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1
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47
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9
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1
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1
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8
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use Carp qw( confess croak ); |
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2
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1
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269
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10
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our $VERSION = 0.10; |
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our $BlockSignals = [ qw( TERM INT ) ]; |
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our @EXPORT = qw( txn_item txn_post_item txn_commit txn_sort ); |
14
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15
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# It's better to look for the "try restarting transaction" string |
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# because sometime may be happens other error: Lock wait timeout exceeded |
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1
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1
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6
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use constant DEADLOCK_REGEXP => qr/try restarting transaction/o; |
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1
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2
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1
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1301
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18
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19
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sub new { |
20
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0
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0
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0
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my ( $class, %args ) = @_; |
21
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22
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0
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0
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croak( __PACKAGE__ . ": the dbh should be defined" ) |
23
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unless $args{dbh}; |
24
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25
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0
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0
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$args{size} ||= 100; |
26
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0
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0
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$args{block_signals} ||= $BlockSignals; |
27
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0
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0
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$args{max_repeated_deadlocks} ||= 5; |
28
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0
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$args{_amnt_nested_signals} = 0; |
29
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0
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$args{_saved_signal_masks} = {}; |
30
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0
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$args{pool} = []; |
31
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0
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$args{amount_deadlocks} = 0; |
32
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33
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0
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0
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bless \%args, ref $class || $class; |
34
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} |
35
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36
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sub DESTROY { |
37
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0
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0
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$_[0]->finish; |
38
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} |
39
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40
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sub txn_item (&@) { |
41
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0
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0
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1
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__PACKAGE__->new( %{ __make_chain( 'item_callback', @_ ) } ); |
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0
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42
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} |
43
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44
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sub txn_post_item (&@) { |
45
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0
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0
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1
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__make_chain( 'post_item_callback', @_ ); |
46
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} |
47
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48
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sub txn_commit (&@) { |
49
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0
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0
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1
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__make_chain( 'commit_callback', @_ ); |
50
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} |
51
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52
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sub txn_sort (&@) { |
53
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0
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0
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1
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my $ret = __make_chain( 'sort_callback', @_ ); |
54
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0
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$ret->{sort_callback_package} = caller; |
55
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0
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$ret; |
56
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} |
57
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58
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sub __make_chain { |
59
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0
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0
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my $cb_name = shift; |
60
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0
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my $cb_func = shift; |
61
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0
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my $ret; |
62
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63
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0
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0
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( $ret = ref $_[0] eq 'HASH' ? $_[0] : { @_ } )->{ $cb_name } = $cb_func; |
64
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0
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$ret; |
65
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} |
66
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67
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0
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0
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1
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sub dbh { $_[0]->{dbh} } |
68
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69
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sub add { |
70
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0
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0
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1
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my ( $self, $data ) = @_; |
71
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72
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0
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$self->{repeated_deadlocks} = 0; |
73
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74
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0
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0
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die "assert: _amnt_nested_signals is not zero!" |
75
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if $self->{_amnt_nested_signals}; |
76
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77
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try { |
78
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0
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0
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push @{ $self->{pool} }, $data; |
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0
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79
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80
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0
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0
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if ( ! $self->{sort_callback} ) { |
81
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0
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$self->start_txn; |
82
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$self->_safe_signals( sub { |
83
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0
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local $_ = $data; |
84
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0
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$self->{item_callback}->( $self, $data ); |
85
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0
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} ); |
86
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} |
87
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} |
88
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catch { |
89
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0
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0
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$self->_check_deadlock( $_ ); |
90
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0
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}; |
91
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92
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0
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$self->finish |
93
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0
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0
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if ( @{ $self->{pool} } >= $self->{size} ); |
94
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95
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0
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0
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die "assert: _amnt_nested_signals is not zero!" |
96
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if $self->{_amnt_nested_signals}; |
97
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} |
98
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99
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sub _check_deadlock { |
100
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0
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0
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my ( $self, $error ) = @_; |
101
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102
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0
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$self->rollback_txn; |
103
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104
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0
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0
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if ( $error =~ DEADLOCK_REGEXP ) { |
105
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0
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$self->{amount_deadlocks}++; |
106
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0
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0
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if ( $self->{repeated_deadlocks} >= $self->{max_repeated_deadlocks} ) { |
107
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0
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confess( "limit ($self->{repeated_deadlocks}) of deadlock resolvings" ) |
108
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} |
109
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else { |
110
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0
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$self->play_pool |
111
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} |
112
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} else { |
113
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# Fatal error - may be bad SQL statement - finish |
114
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0
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$self->{pool} = []; # If DESTROY calls finish() there will not problems |
115
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0
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confess( "error in item callback ($error)" ); |
116
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} |
117
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} |
118
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119
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sub play_pool { |
120
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0
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0
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0
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my $self = shift; |
121
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122
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0
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$self->start_txn; |
123
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124
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$self->_safe_signals( sub { |
125
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0
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0
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select( undef, undef, undef, 0.5 * ++$self->{repeated_deadlocks} ); |
126
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0
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} ); |
127
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128
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try { |
129
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0
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0
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foreach my $data ( @{ $self->{pool} } ) { |
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0
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130
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$self->_safe_signals( sub { |
131
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0
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local $_ = $data; |
132
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0
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$self->{item_callback}->( $self, $data ); |
133
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0
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} ); |
134
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} |
135
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} |
136
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catch { |
137
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0
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0
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$self->_check_deadlock( $_ ); |
138
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0
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}; |
139
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} |
140
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141
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sub finish { |
142
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0
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0
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1
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my $self = shift; |
143
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144
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0
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0
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die "assert: _amnt_nested_signals is not zero!" |
145
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if $self->{_amnt_nested_signals}; |
146
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147
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0
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0
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0
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if ( $self->{sort_callback} && @{ $self->{pool} } ) { |
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0
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148
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1
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1
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108
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no strict 'refs'; |
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1
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2
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1
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874
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149
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0
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local *a = *{"$self->{sort_callback_package}\::a"}; |
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0
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150
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0
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local *b = *{"$self->{sort_callback_package}\::b"}; |
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0
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151
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152
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0
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$self->{pool} = [ sort { $self->{sort_callback}->() } ( @{ $self->{pool} } ) ]; |
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0
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0
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153
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154
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0
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$self->play_pool; |
155
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} |
156
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157
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try { |
158
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0
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0
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$self->{repeated_deadlocks} = 0; |
159
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0
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$self->commit_txn; |
160
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} |
161
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catch { |
162
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0
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|
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0
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|
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$self->_check_deadlock( $_ ); |
163
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0
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|
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}; |
164
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165
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0
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0
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|
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if ( exists $self->{post_item_callback} ) { |
166
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0
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foreach my $data ( @{ $self->{pool} } ) { |
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0
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167
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0
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local $_ = $data; |
168
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0
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$self->{post_item_callback}->( $self, $data ); |
169
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} |
170
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} |
171
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172
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0
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$self->{pool} = []; |
173
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174
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0
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0
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|
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die "assert: _amnt_nested_signals is not zero!" |
175
|
|
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|
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|
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if $self->{_amnt_nested_signals}; |
176
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} |
177
|
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178
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|
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sub start_txn { |
179
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0
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0
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0
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my $self = shift; |
180
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|
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181
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0
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0
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|
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if ( ! $self->{in_txn} ) { |
182
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|
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|
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$self->_safe_signals( sub { |
183
|
0
|
0
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0
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$self->{dbh}->begin_work or die $self->{dbh}->errstr; |
184
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0
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|
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$self->{in_txn} = 1; |
185
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0
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|
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|
} ); |
186
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} |
187
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} |
188
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189
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sub rollback_txn { |
190
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0
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|
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0
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0
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my $self = shift; |
191
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|
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192
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0
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0
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|
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if ( $self->{in_txn} ) { |
193
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|
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|
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$self->_safe_signals( sub { |
194
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0
|
0
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0
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|
$self->{dbh}->rollback or die $self->{dbh}->errstr; |
195
|
0
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|
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|
$self->{in_txn} = undef; |
196
|
0
|
|
|
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|
} ); |
197
|
|
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} |
198
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|
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} |
199
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|
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200
|
|
|
|
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|
|
sub commit_txn { |
201
|
0
|
|
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0
|
0
|
|
my $self = shift; |
202
|
|
|
|
|
|
|
|
203
|
0
|
0
|
|
|
|
|
if ( $self->{in_txn} ) { |
204
|
|
|
|
|
|
|
$self->_safe_signals( sub { |
205
|
0
|
0
|
|
0
|
|
|
$self->{dbh}->commit or die $self->{dbh}->errstr; |
206
|
0
|
|
|
|
|
|
$self->{in_txn} = undef; |
207
|
0
|
|
|
|
|
|
} ); |
208
|
0
|
0
|
|
|
|
|
$self->{commit_callback}->( $self ) |
209
|
|
|
|
|
|
|
if exists $self->{commit_callback}; |
210
|
|
|
|
|
|
|
} |
211
|
|
|
|
|
|
|
} |
212
|
|
|
|
|
|
|
|
213
|
0
|
|
|
0
|
1
|
|
sub amount_deadlocks { $_[0]->{amount_deadlocks} } |
214
|
|
|
|
|
|
|
|
215
|
|
|
|
|
|
|
sub _safe_signals { |
216
|
0
|
|
|
0
|
|
|
my ( $self, $code ) = @_; |
217
|
|
|
|
|
|
|
|
218
|
0
|
0
|
|
|
|
|
if ( ! $self->{_amnt_nested_signals}++ ) { |
219
|
0
|
|
|
|
|
|
for ( @{ $self->{block_signals} } ) { |
|
0
|
|
|
|
|
|
|
220
|
0
|
|
|
|
|
|
$self->{_saved_signal_masks}{ $_ } = $Signal::Mask{ $_ }; |
221
|
0
|
|
|
|
|
|
$Signal::Mask{ $_ } = 1; |
222
|
|
|
|
|
|
|
} |
223
|
|
|
|
|
|
|
} |
224
|
|
|
|
|
|
|
try { |
225
|
0
|
|
|
0
|
|
|
$code->(); |
226
|
|
|
|
|
|
|
} |
227
|
|
|
|
|
|
|
catch { |
228
|
0
|
|
|
0
|
|
|
die $_; |
229
|
|
|
|
|
|
|
} |
230
|
|
|
|
|
|
|
finally { |
231
|
0
|
0
|
|
0
|
|
|
if ( ! --$self->{_amnt_nested_signals} ) { |
232
|
0
|
|
|
|
|
|
for ( @{ $self->{block_signals} } ) { |
|
0
|
|
|
|
|
|
|
233
|
0
|
|
|
|
|
|
$Signal::Mask{ $_ } = delete $self->{_saved_signal_masks}{ $_ }; |
234
|
|
|
|
|
|
|
} |
235
|
|
|
|
|
|
|
} |
236
|
0
|
|
|
|
|
|
}; |
237
|
|
|
|
|
|
|
} |
238
|
|
|
|
|
|
|
|
239
|
|
|
|
|
|
|
1; |
240
|
|
|
|
|
|
|
|
241
|
|
|
|
|
|
|
__END__ |