162306a36Sopenharmony_ciC MP+pooncerelease+poacquireonce 262306a36Sopenharmony_ci 362306a36Sopenharmony_ci(* 462306a36Sopenharmony_ci * Result: Never 562306a36Sopenharmony_ci * 662306a36Sopenharmony_ci * This litmus test demonstrates that smp_store_release() and 762306a36Sopenharmony_ci * smp_load_acquire() provide sufficient ordering for the message-passing 862306a36Sopenharmony_ci * pattern. 962306a36Sopenharmony_ci *) 1062306a36Sopenharmony_ci 1162306a36Sopenharmony_ci{} 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ciP0(int *buf, int *flag) // Producer 1462306a36Sopenharmony_ci{ 1562306a36Sopenharmony_ci WRITE_ONCE(*buf, 1); 1662306a36Sopenharmony_ci smp_store_release(flag, 1); 1762306a36Sopenharmony_ci} 1862306a36Sopenharmony_ci 1962306a36Sopenharmony_ciP1(int *buf, int *flag) // Consumer 2062306a36Sopenharmony_ci{ 2162306a36Sopenharmony_ci int r0; 2262306a36Sopenharmony_ci int r1; 2362306a36Sopenharmony_ci 2462306a36Sopenharmony_ci r0 = smp_load_acquire(flag); 2562306a36Sopenharmony_ci r1 = READ_ONCE(*buf); 2662306a36Sopenharmony_ci} 2762306a36Sopenharmony_ci 2862306a36Sopenharmony_ciexists (1:r0=1 /\ 1:r1=0) (* Bad outcome. *) 29