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| C MP+onceassign+derefonce
|
| (*
| * Result: Never
| *
| * This litmus test demonstrates that rcu_assign_pointer() and
| * rcu_dereference() suffice to ensure that an RCU reader will not see
| * pre-initialization garbage when it traverses an RCU-protected data
| * structure containing a newly inserted element.
| *)
|
| {
| y=z;
| z=0;
| }
|
| P0(int *x, int **y)
| {
| WRITE_ONCE(*x, 1);
| rcu_assign_pointer(*y, x);
| }
|
| P1(int *x, int **y)
| {
| int *r0;
| int r1;
|
| rcu_read_lock();
| r0 = rcu_dereference(*y);
| r1 = READ_ONCE(*r0);
| rcu_read_unlock();
| }
|
| exists (1:r0=x /\ 1:r1=0)
|
|
