1C WRC+poonceonces+Once 2 3(* 4 * Result: Sometimes 5 * 6 * This litmus test is an extension of the message-passing pattern, 7 * where the first write is moved to a separate process. Note that this 8 * test has no ordering at all. 9 *) 10 11{ 12 int x; 13 int y; 14} 15 16P0(int *x) 17{ 18 WRITE_ONCE(*x, 1); 19} 20 21P1(int *x, int *y) 22{ 23 int r0; 24 25 r0 = READ_ONCE(*x); 26 WRITE_ONCE(*y, 1); 27} 28 29P2(int *x, int *y) 30{ 31 int r0; 32 int r1; 33 34 r0 = READ_ONCE(*y); 35 r1 = READ_ONCE(*x); 36} 37 38exists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0) 39