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- C R+fencembonceonces
- (*
- * Result: Never
- *
- * This is the fully ordered (via smp_mb()) version of one of the classic
- * counterintuitive litmus tests that illustrates the effects of store
- * propagation delays. Note that weakening either of the barriers would
- * cause the resulting test to be allowed.
- *)
- {}
- P0(int *x, int *y)
- {
- WRITE_ONCE(*x, 1);
- smp_mb();
- WRITE_ONCE(*y, 1);
- }
- P1(int *x, int *y)
- {
- int r0;
- WRITE_ONCE(*y, 2);
- smp_mb();
- r0 = READ_ONCE(*x);
- }
- exists (y=2 /\ 1:r0=0)
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