First, please put [code ][/code] tags (sans the space) around your listing, it's easier on the eyes. And since we're on the subject, could you shorten your output?

Second: Your thread has to run 8 printf()s, which translates to about 25 system instructions, times 10 = 250 instructions. Given that even a P90 from the last century can do roughly 90000000 instructions per second, your code is done long before the kernel has any reason to preempt it.