18c2ecf20Sopenharmony_ciC ISA2+pooncelock+pooncelock+pombonce 28c2ecf20Sopenharmony_ci 38c2ecf20Sopenharmony_ci(* 48c2ecf20Sopenharmony_ci * Result: Never 58c2ecf20Sopenharmony_ci * 68c2ecf20Sopenharmony_ci * This test shows that write-write ordering provided by locks 78c2ecf20Sopenharmony_ci * (in P0() and P1()) is visible to external process P2(). 88c2ecf20Sopenharmony_ci *) 98c2ecf20Sopenharmony_ci 108c2ecf20Sopenharmony_ci{} 118c2ecf20Sopenharmony_ci 128c2ecf20Sopenharmony_ciP0(int *x, int *y, spinlock_t *mylock) 138c2ecf20Sopenharmony_ci{ 148c2ecf20Sopenharmony_ci spin_lock(mylock); 158c2ecf20Sopenharmony_ci WRITE_ONCE(*x, 1); 168c2ecf20Sopenharmony_ci WRITE_ONCE(*y, 1); 178c2ecf20Sopenharmony_ci spin_unlock(mylock); 188c2ecf20Sopenharmony_ci} 198c2ecf20Sopenharmony_ci 208c2ecf20Sopenharmony_ciP1(int *y, int *z, spinlock_t *mylock) 218c2ecf20Sopenharmony_ci{ 228c2ecf20Sopenharmony_ci int r0; 238c2ecf20Sopenharmony_ci 248c2ecf20Sopenharmony_ci spin_lock(mylock); 258c2ecf20Sopenharmony_ci r0 = READ_ONCE(*y); 268c2ecf20Sopenharmony_ci WRITE_ONCE(*z, 1); 278c2ecf20Sopenharmony_ci spin_unlock(mylock); 288c2ecf20Sopenharmony_ci} 298c2ecf20Sopenharmony_ci 308c2ecf20Sopenharmony_ciP2(int *x, int *z) 318c2ecf20Sopenharmony_ci{ 328c2ecf20Sopenharmony_ci int r1; 338c2ecf20Sopenharmony_ci int r2; 348c2ecf20Sopenharmony_ci 358c2ecf20Sopenharmony_ci r2 = READ_ONCE(*z); 368c2ecf20Sopenharmony_ci smp_mb(); 378c2ecf20Sopenharmony_ci r1 = READ_ONCE(*x); 388c2ecf20Sopenharmony_ci} 398c2ecf20Sopenharmony_ci 408c2ecf20Sopenharmony_ciexists (1:r0=1 /\ 2:r2=1 /\ 2:r1=0) 41