162306a36Sopenharmony_ciC SB+poonceonces 262306a36Sopenharmony_ci 362306a36Sopenharmony_ci(* 462306a36Sopenharmony_ci * Result: Sometimes 562306a36Sopenharmony_ci * 662306a36Sopenharmony_ci * This litmus test demonstrates that at least some ordering is required 762306a36Sopenharmony_ci * to order the store-buffering pattern, where each process writes to the 862306a36Sopenharmony_ci * variable that the preceding process reads. 962306a36Sopenharmony_ci *) 1062306a36Sopenharmony_ci 1162306a36Sopenharmony_ci{} 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ciP0(int *x, int *y) 1462306a36Sopenharmony_ci{ 1562306a36Sopenharmony_ci int r0; 1662306a36Sopenharmony_ci 1762306a36Sopenharmony_ci WRITE_ONCE(*x, 1); 1862306a36Sopenharmony_ci r0 = READ_ONCE(*y); 1962306a36Sopenharmony_ci} 2062306a36Sopenharmony_ci 2162306a36Sopenharmony_ciP1(int *x, int *y) 2262306a36Sopenharmony_ci{ 2362306a36Sopenharmony_ci int r0; 2462306a36Sopenharmony_ci 2562306a36Sopenharmony_ci WRITE_ONCE(*y, 1); 2662306a36Sopenharmony_ci r0 = READ_ONCE(*x); 2762306a36Sopenharmony_ci} 2862306a36Sopenharmony_ci 2962306a36Sopenharmony_ciexists (0:r0=0 /\ 1:r0=0) 30