1C LB+poonceonces 2 3{} 4 5P0(int *x, int *y) 6{ 7 int r0; 8 9 r0 = READ_ONCE(*x); 10 WRITE_ONCE(*y, 1); 11} 12 13P1(int *x, int *y) 14{ 15 int r0; 16 17 r0 = READ_ONCE(*y); 18 WRITE_ONCE(*x, 1); 19} 20 21exists (0:r0=1 /\ 1:r0=1) 22