From below you should be able to see that logLine is repeated in every library and I would like to move it to common. So the two questions I have are how will 'caller' be affected and how would i correctly provide the FH and SEM?

MAIN.PL 
#semaphores
my $writelog = Thread::Semaphore->new(); #sequential log writing

#LIBS:
use common;

open my $LOGFH ,">", $files{log}{file}; #from common
#disable write buffer
my $stdout = select($LOGFH);
$| = 1;
select($stdout);

require other;
other->import(\$LOGFH, \$writelog); #FH, SEM

logLine("TEST");

sub logLine {
    my ($text) =@_;
    chomp($text);
    my ($package, $filename, $line) = caller;
    my $FunctionName = (caller(1))[3];
    if ($FunctionName =~ m/::(.+)/) {
        $FunctionName = $1;
    }
    my $time = localtime time;

    #do sprintf left align truncate until sprintf supports
    if ($files{log}{fileNameLen} =~ m/-\d+\.(\d+)/) {
        $filename = substr($filename, 0, $1);
    }
    if ($files{log}{funNameLen} =~ m/-\d+\.(\d+)/) {
        $FunctionName = substr($FunctionName, 0, $1);
    }

    my $header = sprintf("%*s, %*s, %*s, %*s:", $files{log}{timeLen}, 
+$time, $files{log}{fileNameLen}, $filename, $files{log}{funNameLen}, 
+$FunctionName, $files{log}{lineNumLen}, $line);
    print "$header $text\n"; #only for testing
    if (defined $writelog and defined $LOGFH) {
        $writelog->down();
        print $LOGFH "$header $text\n";
        $writelog->up();
    }
}

[download]
COMMON.PM 
package other;

use Exporter;
our @ISA = qw(Exporter);
our @EXPORT = qw($sourcepath %files);

our $sourcepath = dirname(Cwd::abs_path(__FILE__)); #Where am I locate
+d at?
unless ($sourcepath =~ m/\\$/) {
    $sourcepath .= "\\";
}

our %files = (
    log => {
        file => $sourcepath."file.log",
        fileNameLen => -22.22,
        funNameLen => -21.21,
        lineNumLen => 5,
        timeLen => 24.24,
    },
);

[download]
OTHER.PM 
package other.pm

use common;

sub import {
    shift;
    $LOGFH = ${$_[0]};
    $writelog = ${$_[1]};
}

logLine("TEST");

sub logLine {
    my ($text) =@_;
    chomp($text);
    my ($package, $filename, $line) = caller;
    my $FunctionName = (caller(1))[3];
    if ($FunctionName =~ m/::(.+)/) {
        $FunctionName = $1;
    }
    my $time = localtime time;

    #do sprintf left align truncate until sprintf supports
    if ($files{log}{fileNameLen} =~ m/-\d+\.(\d+)/) {
        $filename = substr($filename, 0, $1);
    }
    if ($files{log}{funNameLen} =~ m/-\d+\.(\d+)/) {
        $FunctionName = substr($FunctionName, 0, $1);
    }

    my $header = sprintf("%*s, %*s, %*s, %*s:", $files{log}{timeLen}, 
+$time, $files{log}{fileNameLen}, $filename, $files{log}{funNameLen}, 
+$FunctionName, $files{log}{lineNumLen}, $line);
    print "$header $text\n"; #only for testing
    if (defined $writelog and defined $LOGFH) {
        $writelog->down();
        print $LOGFH "$header $text\n";
        $writelog->up();
    }
}

[download]
the other sub to move to common: 
sub debugLogFunctionNameLineNum {
#debugLogFunctionNameLineNum((caller(0))[2],(caller(1))[3], @_);
    my ($callerline, $caller, @input) = @_;
    my $input_msg = "";
    for (my $i = 0; $i < @input; $i++) {
        unless (defined $input[$i]) {
            $input[$i] = "undef";
        }
        $input_msg .= "$i=>$input[$i]";
        if ($i < $#input) {
            $input_msg .= ", ";
        }
    }
    my ($package, $filename, $line) = caller;
    unless ($caller) {
        $caller = $filename;
    }
    if ($caller =~ m/eval/) {
        $caller = "Tk call";
        $callerline = "Unknown";
    } else {
        if ($callerline =~ m/::(.+)/) {
            $callerline = $1;
        }
    }
    my $FunctionName = (caller(1))[3];
    if ($FunctionName =~ m/::(.+)/) {
        $FunctionName = $1;
    }
    my $time = localtime time;
    unless ($FunctionName) {
        $FunctionName = "MAIN";
    }

    #do sprintf left align truncate until sprintf supports
    if ($files{log}{fileNameLen} =~ m/-\d+\.(\d+)/) {
        $filename = substr($filename, 0, $1);
    }
    if ($files{log}{funNameLen} =~ m/-\d+\.(\d+)/) {
        $FunctionName = substr($FunctionName, 0, $1);
    }

    my $header = sprintf("%*s, %*s, %*s, %*s:", $files{log}{timeLen}, 
+$time, $files{log}{fileNameLen}, $filename, $files{log}{funNameLen}, 
+$FunctionName, $files{log}{lineNumLen}, $line);
    print "$header Called from [$caller] at [$callerline] with options
+ [$input_msg]\n"; #only for testing
    if (defined $writelog and defined $LOGFH) {
        $writelog->down();
        print $LOGFH "$header Called from [$caller] at [$callerline] w
+ith options [$input_msg]\n";
        $writelog->up();
    }
}

[download]

In reply to Threaded logging. Method change help. by glenn

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