Consider the following two threads, to be run concurrently in a shared memory (all variables are shared between the two threads).

Assuming a single processor system, that load and store are atomic, that x is initialized to 0, and that x must be loaded into a register before being incremented (and stored back to memory afterwards), what are all the possible values for x after both threads have completed?

Co Thread A Thread B for i = 1 to 5 do x=x+ 1; for,-1 to 5 do x=x+1