cis4307, Fall 2009
10 Minute Test # 1
September 10, 2009


(10) 1. Implement the lock operation of  spinlocks using the CompareAndSwap instruction.












(10) 2. Spinlocks suffer of the Priority Inversion problem.
	Describe in detail what it is.















(15) 3.	Implement in C the function char * doubleup(const char * s)
	which, given a string s, returns a new string consisting of s with each
        character repeated twice. So doubleup("nabucco") is "nnaabbuuccccoo".