162306a36Sopenharmony_ciC WRC+poonceonces+Once 262306a36Sopenharmony_ci 362306a36Sopenharmony_ci(* 462306a36Sopenharmony_ci * Result: Sometimes 562306a36Sopenharmony_ci * 662306a36Sopenharmony_ci * This litmus test is an extension of the message-passing pattern, 762306a36Sopenharmony_ci * where the first write is moved to a separate process. Note that this 862306a36Sopenharmony_ci * test has no ordering at all. 962306a36Sopenharmony_ci *) 1062306a36Sopenharmony_ci 1162306a36Sopenharmony_ci{} 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ciP0(int *x) 1462306a36Sopenharmony_ci{ 1562306a36Sopenharmony_ci WRITE_ONCE(*x, 1); 1662306a36Sopenharmony_ci} 1762306a36Sopenharmony_ci 1862306a36Sopenharmony_ciP1(int *x, int *y) 1962306a36Sopenharmony_ci{ 2062306a36Sopenharmony_ci int r0; 2162306a36Sopenharmony_ci 2262306a36Sopenharmony_ci r0 = READ_ONCE(*x); 2362306a36Sopenharmony_ci WRITE_ONCE(*y, 1); 2462306a36Sopenharmony_ci} 2562306a36Sopenharmony_ci 2662306a36Sopenharmony_ciP2(int *x, int *y) 2762306a36Sopenharmony_ci{ 2862306a36Sopenharmony_ci int r0; 2962306a36Sopenharmony_ci int r1; 3062306a36Sopenharmony_ci 3162306a36Sopenharmony_ci r0 = READ_ONCE(*y); 3262306a36Sopenharmony_ci r1 = READ_ONCE(*x); 3362306a36Sopenharmony_ci} 3462306a36Sopenharmony_ci 3562306a36Sopenharmony_ciexists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0) 36