29 lines · plain
1C MP+pooncerelease+poacquireonce2 3(*4 * Result: Never5 *6 * This litmus test demonstrates that smp_store_release() and7 * smp_load_acquire() provide sufficient ordering for the message-passing8 * pattern.9 *)10 11{}12 13P0(int *buf, int *flag) // Producer14{15 WRITE_ONCE(*buf, 1);16 smp_store_release(flag, 1);17}18 19P1(int *buf, int *flag) // Consumer20{21 int r0;22 int r1;23 24 r0 = smp_load_acquire(flag);25 r1 = READ_ONCE(*buf);26}27 28exists (1:r0=1 /\ 1:r1=0) (* Bad outcome. *)29