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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.
- *)
- {
- p=y;
- }
- P0(int *x, int **p) // Producer
- {
- WRITE_ONCE(*x, 1);
- rcu_assign_pointer(*p, x);
- }
- P1(int *x, int **p) // Consumer
- {
- int *r0;
- int r1;
- rcu_read_lock();
- r0 = rcu_dereference(*p);
- r1 = READ_ONCE(*r0);
- rcu_read_unlock();
- }
- exists (1:r0=x /\ 1:r1=0) (* Bad outcome. *)
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