version 1.6, 2006/06/19 09:35:08
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version 1.11, 2006/06/27 21:47:15
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Line 40 my $loncapa_max_wait_time = 13;
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Line 40 my $loncapa_max_wait_time = 13;
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require Exporter; |
require Exporter; |
our @ISA = qw (Exporter); |
our @ISA = qw (Exporter); |
our @EXPORT = qw(&add_get_param &escape &unescape &tie_domain_hash &untie_domain_hash &tie_user_hash &untie_user_hash &propath); |
our @EXPORT = qw(&escape_LaTeX &add_get_param &escape &unescape &tie_domain_hash &untie_domain_hash &tie_user_hash &untie_user_hash &propath); |
my %perlvar; |
my %perlvar; |
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# Escape a LaTeX string of special characters that according to LaTeX line by line |
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# pg 9 are: # $ % & \ ^ _ { } ~ These are escaped by prepending a \ |
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# |
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sub escape_LaTeX { |
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my ($string) = @_; |
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$string =~ s/[\#\$\%\&\\^_{}]/\\$&/g; |
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return $string; |
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} |
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# Inputs are a url, and a hash ref of |
# Inputs are a url, and a hash ref of |
# form name => value pairs |
# form name => value pairs |
# takes care of properly adding the form name elements and values to the |
# takes care of properly adding the form name elements and values to the |
Line 173 sub untie_user_hash {
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Line 183 sub untie_user_hash {
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sub locking_hash_tie { |
sub locking_hash_tie { |
my ($filename,$how)=@_; |
my ($filename,$how)=@_; |
my ($file_prefix,$namespace)=&db_filename_parts($filename); |
my ($file_prefix,$namespace)=&db_filename_parts($filename); |
unless ($namespace) { return undef; } |
if ($namespace eq '') { return undef; } |
return &_locking_hash_tie($file_prefix,$namespace,$how); |
return &_locking_hash_tie($file_prefix,$namespace,$how); |
} |
} |
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Line 184 sub locking_hash_untie {
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Line 194 sub locking_hash_untie {
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sub db_filename_parts { |
sub db_filename_parts { |
my ($filename)=@_; |
my ($filename)=@_; |
my ($file_path,$namespace)=($filename=~/^(.*)\/([^\/]+)\.db$/); |
my ($file_path,$namespace)=($filename=~/^(.*)\/([^\/]+)\.db$/); |
unless ($namespace) { return undef; } |
if ($namespace eq '') { return undef; } |
return ($file_path.'/'.$namespace,$namespace); |
return ($file_path.'/'.$namespace,$namespace); |
} |
} |
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Line 218 sub _do_hash_untie {
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Line 228 sub _do_hash_untie {
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{ |
{ |
my $sym; |
my $sym; |
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my @pushed_syms; |
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sub clean_sym { |
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undef($sym); |
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} |
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sub push_locking_hash_tie { |
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if (!defined($sym)) { |
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die("Invalid used of push_locking_hash_tie, should only be called after a lock has occurred and before and unlock."); |
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} |
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push(@pushed_syms,$sym); |
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undef($sym); |
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} |
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sub pop_locking_hash_tie { |
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if (defined($sym)) { |
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die("Invalid nested used of pop_locking_hash_tie, should only be called after a unlock has occurred."); |
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} |
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$sym = pop(@pushed_syms); |
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} |
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sub _locking_hash_tie { |
sub _locking_hash_tie { |
my ($file_prefix,$namespace,$how,$loghead,$what) = @_; |
my ($file_prefix,$namespace,$how,$loghead,$what) = @_; |
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if (defined($sym)) { |
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die('Nested locking attempted without proper use of push_locking_hash_tie, this is unsupported'); |
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} |
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my $lock_type=LOCK_SH; |
my $lock_type=LOCK_SH; |
# Are we reading or writing? |
# Are we reading or writing? |
if ($how eq &GDBM_READER()) { |
if ($how eq &GDBM_READER()) { |
Line 232 sub _do_hash_untie {
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Line 265 sub _do_hash_untie {
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if ((! -e "$file_prefix.db") && (! -e "$file_prefix.db.gz")) { |
if ((! -e "$file_prefix.db") && (! -e "$file_prefix.db.gz")) { |
# No such file. Forget it. |
# No such file. Forget it. |
$! = 2; |
$! = 2; |
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&clean_sym(); |
return undef; |
return undef; |
} |
} |
# Apparently just no lock file yet. Make one |
# Apparently just no lock file yet. Make one |
open($sym,">>$file_prefix.db.lock"); |
open($sym,">>$file_prefix.db.lock"); |
} |
} |
# Do a shared lock |
# Do a shared lock |
if (!&flock_sym(LOCK_SH)) { return undef; } |
if (!&flock_sym(LOCK_SH)) { |
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&clean_sym(); |
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return undef; |
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} |
# If this is compressed, we will actually need an exclusive lock |
# If this is compressed, we will actually need an exclusive lock |
if (-e "$file_prefix.db.gz") { |
if (-e "$file_prefix.db.gz") { |
if (!&flock_sym(LOCK_EX)) { return undef; } |
if (!&flock_sym(LOCK_EX)) { |
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&clean_sym(); |
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return undef; |
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} |
} |
} |
} elsif ($how eq &GDBM_WRCREAT()) { |
} elsif ($how eq &GDBM_WRCREAT()) { |
# We are writing |
# We are writing |
open($sym,">>$file_prefix.db.lock"); |
open($sym,">>$file_prefix.db.lock"); |
# Writing needs exclusive lock |
# Writing needs exclusive lock |
if (!&flock_sym(LOCK_EX)) { return undef; } |
if (!&flock_sym(LOCK_EX)) { |
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&clean_sym(); |
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return undef; |
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} |
} else { |
} else { |
die("Unknown method $how for $file_prefix"); |
die("Unknown method $how for $file_prefix"); |
} |
} |
Line 291 sub _do_hash_untie {
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Line 334 sub _do_hash_untie {
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my $result = untie(%$hashref); |
my $result = untie(%$hashref); |
flock($sym,LOCK_UN); |
flock($sym,LOCK_UN); |
close($sym); |
close($sym); |
undef($sym); |
&clean_sym(); |
return $result; |
return $result; |
} |
} |
} |
} |