C MP+poonceonces (* * Result: Sometimes * * Can the counter-intuitive message-passing outcome be prevented with * no ordering at all? *) {} P0(int *buf, int *flag) // Producer { WRITE_ONCE(*buf, 1); WRITE_ONCE(*flag, 1); } P1(int *buf, int *flag) // Consumer { int r0; int r1; r0 = READ_ONCE(*flag); r1 = READ_ONCE(*buf); } exists (1:r0=1 /\ 1:r1=0) (* Bad outcome. *)
