162306a36Sopenharmony_ciC S+poonceonces 262306a36Sopenharmony_ci 362306a36Sopenharmony_ci(* 462306a36Sopenharmony_ci * Result: Sometimes 562306a36Sopenharmony_ci * 662306a36Sopenharmony_ci * Starting with a two-process release-acquire chain ordering P0()'s 762306a36Sopenharmony_ci * first store against P1()'s final load, if the smp_store_release() 862306a36Sopenharmony_ci * is replaced by WRITE_ONCE() and the smp_load_acquire() replaced by 962306a36Sopenharmony_ci * READ_ONCE(), is ordering preserved? 1062306a36Sopenharmony_ci *) 1162306a36Sopenharmony_ci 1262306a36Sopenharmony_ci{} 1362306a36Sopenharmony_ci 1462306a36Sopenharmony_ciP0(int *x, int *y) 1562306a36Sopenharmony_ci{ 1662306a36Sopenharmony_ci WRITE_ONCE(*x, 2); 1762306a36Sopenharmony_ci WRITE_ONCE(*y, 1); 1862306a36Sopenharmony_ci} 1962306a36Sopenharmony_ci 2062306a36Sopenharmony_ciP1(int *x, int *y) 2162306a36Sopenharmony_ci{ 2262306a36Sopenharmony_ci int r0; 2362306a36Sopenharmony_ci 2462306a36Sopenharmony_ci r0 = READ_ONCE(*y); 2562306a36Sopenharmony_ci WRITE_ONCE(*x, 1); 2662306a36Sopenharmony_ci} 2762306a36Sopenharmony_ci 2862306a36Sopenharmony_ciexists (x=2 /\ 1:r0=1) 29