162306a36Sopenharmony_ciC ISA2+pooncelock+pooncelock+pombonce 262306a36Sopenharmony_ci 362306a36Sopenharmony_ci(* 462306a36Sopenharmony_ci * Result: Never 562306a36Sopenharmony_ci * 662306a36Sopenharmony_ci * This test shows that write-write ordering provided by locks 762306a36Sopenharmony_ci * (in P0() and P1()) is visible to external process P2(). 862306a36Sopenharmony_ci *) 962306a36Sopenharmony_ci 1062306a36Sopenharmony_ci{} 1162306a36Sopenharmony_ci 1262306a36Sopenharmony_ciP0(int *x, int *y, spinlock_t *mylock) 1362306a36Sopenharmony_ci{ 1462306a36Sopenharmony_ci spin_lock(mylock); 1562306a36Sopenharmony_ci WRITE_ONCE(*x, 1); 1662306a36Sopenharmony_ci WRITE_ONCE(*y, 1); 1762306a36Sopenharmony_ci spin_unlock(mylock); 1862306a36Sopenharmony_ci} 1962306a36Sopenharmony_ci 2062306a36Sopenharmony_ciP1(int *y, int *z, spinlock_t *mylock) 2162306a36Sopenharmony_ci{ 2262306a36Sopenharmony_ci int r0; 2362306a36Sopenharmony_ci 2462306a36Sopenharmony_ci spin_lock(mylock); 2562306a36Sopenharmony_ci r0 = READ_ONCE(*y); 2662306a36Sopenharmony_ci WRITE_ONCE(*z, 1); 2762306a36Sopenharmony_ci spin_unlock(mylock); 2862306a36Sopenharmony_ci} 2962306a36Sopenharmony_ci 3062306a36Sopenharmony_ciP2(int *x, int *z) 3162306a36Sopenharmony_ci{ 3262306a36Sopenharmony_ci int r1; 3362306a36Sopenharmony_ci int r2; 3462306a36Sopenharmony_ci 3562306a36Sopenharmony_ci r2 = READ_ONCE(*z); 3662306a36Sopenharmony_ci smp_mb(); 3762306a36Sopenharmony_ci r1 = READ_ONCE(*x); 3862306a36Sopenharmony_ci} 3962306a36Sopenharmony_ci 4062306a36Sopenharmony_ciexists (1:r0=1 /\ 2:r2=1 /\ 2:r1=0) 41