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1C MP+poonceonces2 3(*4 * Result: Sometimes5 *6 * Can the counter-intuitive message-passing outcome be prevented with7 * no ordering at all?8 *)9 10{}11 12P0(int *buf, int *flag) // Producer13{14 WRITE_ONCE(*buf, 1);15 WRITE_ONCE(*flag, 1);16}17 18P1(int *buf, int *flag) // Consumer19{20 int r0;21 int r1;22 23 r0 = READ_ONCE(*flag);24 r1 = READ_ONCE(*buf);25}26 27exists (1:r0=1 /\ 1:r1=0) (* Bad outcome. *)28