Using time.sleep() in 2 threads causes lockup when hyper-threading is enabled

[OlafMeding at gmail.com]

Serge

> I got bored and tried to stop it with ctrl-c ...

Yes, you have to use the ctrl-break key to stop the first program.  And
neither program every hangs on a single core CPU.  It also does not
hang on a hyper-threading CPU if hyper-threading is turned off in the
BIOS.

Olaf