I hope it print 1 to 100 in turn
There's no reason to expect that.
Process 1 launches process 1.1 and prints 1
Process 1 launches process 1.2 and prints 2
Process 1 launches process 1.3 and prints 3
...
Independently,
Process 1.1 launches process 1.1.1 and prints 2
Process 1.1 launches process 1.1.2 and prints 3
Process 1.1 launches process 1.1.3 and prints 4
...
Independently,
Process 1.2 launches process 1.2.1 and prints 3
Process 1.2 launches process 1.2.2 and prints 4
Process 1.2 launches process 1.2.3 and prints 5
...
Independently,
Process 1.1.1 launches process 1.1.1.1 and prints 3
Process 1.1.1 launches process 1.1.1.2 and prints 4
Process 1.1.1 launches process 1.1.1.3 and prints 5
...
...
Aside from printing the same numbers more than once, there's no concurrency control to ensure they happen in order.
Are you re-inventing Parallel::ForkManager?
Eventually it print 'out of memory' and crash.
By my quick count, your code results in up to 56 processes (unix) or threads (Windows) executing simultaneously. That's not a small number.
So my question is whether my script could be reused on win32 by a little work or I have to totally rewrite it in thread?
You are already using threads. fork creates threads on Windows.
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