| C MP+fencewmbonceonce+fencermbonceonce | |
| (* | |
| * Result: Never | |
| * | |
| * This litmus test demonstrates that smp_wmb() and smp_rmb() provide | |
| * sufficient ordering for the message-passing pattern. However, it | |
| * is usually better to use smp_store_release() and smp_load_acquire(). | |
| *) | |
| {} | |
| P0(int *x, int *y) | |
| { | |
| WRITE_ONCE(*x, 1); | |
| smp_wmb(); | |
| WRITE_ONCE(*y, 1); | |
| } | |
| P1(int *x, int *y) | |
| { | |
| int r0; | |
| int r1; | |
| r0 = READ_ONCE(*y); | |
| smp_rmb(); | |
| r1 = READ_ONCE(*x); | |
| } | |
| exists (1:r0=1 /\ 1:r1=0) |