18c2ecf20Sopenharmony_ciC MP+poonceonces 28c2ecf20Sopenharmony_ci 38c2ecf20Sopenharmony_ci(* 48c2ecf20Sopenharmony_ci * Result: Sometimes 58c2ecf20Sopenharmony_ci * 68c2ecf20Sopenharmony_ci * Can the counter-intuitive message-passing outcome be prevented with 78c2ecf20Sopenharmony_ci * no ordering at all? 88c2ecf20Sopenharmony_ci *) 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ci{} 118c2ecf20Sopenharmony_ci 128c2ecf20Sopenharmony_ciP0(int *x, int *y) 138c2ecf20Sopenharmony_ci{ 148c2ecf20Sopenharmony_ci WRITE_ONCE(*x, 1); 158c2ecf20Sopenharmony_ci WRITE_ONCE(*y, 1); 168c2ecf20Sopenharmony_ci} 178c2ecf20Sopenharmony_ci 188c2ecf20Sopenharmony_ciP1(int *x, int *y) 198c2ecf20Sopenharmony_ci{ 208c2ecf20Sopenharmony_ci int r0; 218c2ecf20Sopenharmony_ci int r1; 228c2ecf20Sopenharmony_ci 238c2ecf20Sopenharmony_ci r0 = READ_ONCE(*y); 248c2ecf20Sopenharmony_ci r1 = READ_ONCE(*x); 258c2ecf20Sopenharmony_ci} 268c2ecf20Sopenharmony_ci 278c2ecf20Sopenharmony_ciexists (1:r0=1 /\ 1:r1=0) 28