>>>>> "W" == William Djaja Tjokroaminata <billtj / z.glue.umd.edu> writes:

W> Although currently the problem has been solved, I don't know whether there
W> are other "time bombs" still lurking in my code.  That's why I am asking
W> the rule of when it is necessary to protect the global variables.  Is it
W> that such a rule does not exist that you need to see the actual source?

 No, these rules exist but I don't want to formalize them because I don't
 speak english. When you ask for help, it's best to give the maximum of
 informations, otherwise you'll have only useless responses.

Guy Decoux