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Thank you for pointing me to PEP 7. I'll take a look at where I am amiss 
and fix it up. For the change in ceval.c, I took a look at gcc's x86 
assembly output of the file, and noticed that the optimizer was altering 
the order of the busy flag test. Since busy is set from other concurrent 
execution (other signal handlers), changing the variable to volatile told 
gcc not to optimize accesses to the variable.