Seems problem that join() call blocks signals (i.e. signal will arrive after join() finished).

some related links:

http://stackoverflow.com/questions/7534566/perl-trapping-ctrl-c-with-threads-in-bash

http://cpanforum.com/threads/2548

In reply to Re: Sending signals to threads that trying to join by vsespb
in thread Sending signals to threads that trying to join by mojo2405

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