G'day Tobias,

Problems with what you've posted:

• You haven't shown what DebuggerInit() does.
• You haven't shown how you run this code.
• There's no self-contained script that we can run to reproduce the problem.
• You don't show actual or expected output nor any error (or other) messages.

Having said that, declaring $debugger as being scoped to the entire package leaps out at me as being a potential source of problems (either now or in the future). Consider this scenario:

$ perl -Mstrict -Mwarnings -le '
    package myDebugger;
    my $debugger;
    sub GetInstance { defined $debugger ? $debugger : DebuggerInit() }
    sub DebuggerInit { $debugger = "singleton" }
    # a typo later in your code (perhaps "$debug = 0;" was intended)
    my $debug = 1;
    # ...
    $debugger = 0;

    package main;
    print myDebugger::GetInstance();
    print myDebugger::GetInstance();
'
0
0
[download]

Now see what happens if the scope is changed such that only GetInstance() and DebuggerInit() can see $debugger:

$ perl -Mstrict -Mwarnings -le '
    package myDebugger;
    {
        my $debugger;
        sub GetInstance { defined $debugger ? $debugger : DebuggerInit
+() }
        sub DebuggerInit { $debugger = "singleton" }
    }
    # a typo later in your code (perhaps "$debug = 0;" was intended)
    my $debug = 1;
    # ...
    $debugger = 0;

    package main;
    print myDebugger::GetInstance();
    print myDebugger::GetInstance();
'
Global symbol "$debugger" requires explicit package name at -e line 11
+.
Execution of -e aborted due to compilation errors.
[download]

Fixing the typo (at line 11):

$ perl -Mstrict -Mwarnings -le '
    package myDebugger;
    {
        my $debugger;
        sub GetInstance { defined $debugger ? $debugger : DebuggerInit
+() }
        sub DebuggerInit { $debugger = "singleton" }
    }
    # a typo later in your code (perhaps "$debug = 0;" was intended)
    my $debug = 1;
    # ...
    $debug = 0;

    package main;
    print myDebugger::GetInstance();
    print myDebugger::GetInstance();
'
singleton
singleton
[download]

Please create a minimal, self-contained script that reproduces your problem as described in the "How do I post a question effectively?" guidelines. As ++rjt has pointed out, by doing this you may resolve the problem on your own. If you need further help, please also include the missing information I alluded to above and also described in the guidelines I've linked to.

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