PPC L01 "reference, one thread" {0:r5=L_y; 0:r6=L_x; 0:r2=y; 0:r4=x;} P0 ; li r1,1 ; LOCK(r5) ; stw r1,0(r2) ; UNLOCK(r5) ; LOCK(r6) ; lwz r3,0(r4) ; UNLOCK(r6) ; locations [0:r3; ]