162306a36Sopenharmony_ciC MP+poonceonces 262306a36Sopenharmony_ci 362306a36Sopenharmony_ci(* 462306a36Sopenharmony_ci * Result: Sometimes 562306a36Sopenharmony_ci * 662306a36Sopenharmony_ci * Can the counter-intuitive message-passing outcome be prevented with 762306a36Sopenharmony_ci * no ordering at all? 862306a36Sopenharmony_ci *) 962306a36Sopenharmony_ci 1062306a36Sopenharmony_ci{} 1162306a36Sopenharmony_ci 1262306a36Sopenharmony_ciP0(int *buf, int *flag) // Producer 1362306a36Sopenharmony_ci{ 1462306a36Sopenharmony_ci WRITE_ONCE(*buf, 1); 1562306a36Sopenharmony_ci WRITE_ONCE(*flag, 1); 1662306a36Sopenharmony_ci} 1762306a36Sopenharmony_ci 1862306a36Sopenharmony_ciP1(int *buf, int *flag) // Consumer 1962306a36Sopenharmony_ci{ 2062306a36Sopenharmony_ci int r0; 2162306a36Sopenharmony_ci int r1; 2262306a36Sopenharmony_ci 2362306a36Sopenharmony_ci r0 = READ_ONCE(*flag); 2462306a36Sopenharmony_ci r1 = READ_ONCE(*buf); 2562306a36Sopenharmony_ci} 2662306a36Sopenharmony_ci 2762306a36Sopenharmony_ciexists (1:r0=1 /\ 1:r1=0) (* Bad outcome. *) 28