Devel::STrace::Monitor - Monitor interface component for Devel::STrace

NAME

Devel::STrace::Monitor - Monitor interface component for Devel::STrace

SYNOPSIS

    #
    #    open the mmap'ed file
    #
    use Devel::STrace::Monitor;

    my $view = Devel::STrace::Monitor->open('somefile.map');

    my $cycles = 0;
    while (1) {
        print "\n**************************************\n";
    #
    #    refresh the internal ringbuffer map
    #
        $view->refresh();
    #
    #    dump the current traces
    #
        $view->trace(\&dump_trace);

        sleep 10;
    }
    #
    #    method to display the traces
    #
    sub dump_trace {
        my ($key, $slot, $depth, $line, $time, $entry) = @_;

        $lastkey = $key,
        print "\n**************************************\n"
            unless ($lastkey eq $key);

        if ($time) {
    #
    #    trim the weekday and year from timestamp
    #
            my $frac = ($time - int($time)) * 1000000;
            $frac=~s/\..*$//;
            my @parts = split(/\s+/, scalar localtime($time));
            pop @parts;    # get rid of year
            print "$key($depth) : $slot : $entry:$line at ",
                join(' ', @parts), '.', $frac, "\n";
        }
        else {
            print "$key($depth) : $slot : $entry:$line (No timestamp)\n";
        }
    }

DESCRIPTION

Provides methods to

attach to and read the memory mapped file generated by the Devel::STrace manpage (or future full featured debuggers) using the Devel::RingBuffer manpage.
set or clear any of the $DB::single, $DB::trace, or $DB::signal control variables of the AUT (via their tie'd interfaces in the AUT).
inspect the current execution call stack of the AUT

The interfaces provide a simple framework for building an external application that can attach to a running Perl application, monitor its current execution, and eventually detach, all while permitting the application continue to run uninterrupted.

A more complete debugger module is planned to exploit the various command/control structures available via the Devel::RingBuffer manpage. Note that this module will be fully compatible with the resulting debugger so that, e.g., an application can first be monitored to detect troublespots, and then the debugger can be attached to fully debug the problem.

METHODS

Refer to the include classdocs for summary and detail method descriptions.

AUTHOR, COPYRIGHT, AND LICENSE

Dean Arnold mailto:darnold@presicient.com