| 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) |