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Assigned to Guido to get an answer to one of the questions 
here:  Guido, signal_handler() checks getpid() against 
main_pid, and has ever since revision 2.3 (when you first 
taught signalmodule.c about threads).  But on every pthreads 
box except for Linux, get_pid() should always equal main_pid 
(even after a fork).  What was the intent?  I read the 
comments the same as Andrew does here, that the intent 
was to check thread identity, not process identity.