| Paul E. McKenney | 1c27b64 | 2018-01-18 19:58:55 -0800 | [diff] [blame] | 1 | C R+poonceonces |
| 2 | |||||
| Paul E. McKenney | 8f32543 | 2018-02-20 15:25:04 -0800 | [diff] [blame] | 3 | (* |
| 4 | * Result: Sometimes | ||||
| 5 | * | ||||
| 6 | * This is the unordered (thus lacking smp_mb()) version of one of the | ||||
| 7 | * classic counterintuitive litmus tests that illustrates the effects of | ||||
| 8 | * store propagation delays. | ||||
| 9 | *) | ||||
| 10 | |||||
| Paul E. McKenney | 1c27b64 | 2018-01-18 19:58:55 -0800 | [diff] [blame] | 11 | {} |
| 12 | |||||
| 13 | P0(int *x, int *y) | ||||
| 14 | { | ||||
| 15 | WRITE_ONCE(*x, 1); | ||||
| 16 | WRITE_ONCE(*y, 1); | ||||
| 17 | } | ||||
| 18 | |||||
| 19 | P1(int *x, int *y) | ||||
| 20 | { | ||||
| 21 | int r0; | ||||
| 22 | |||||
| 23 | WRITE_ONCE(*y, 2); | ||||
| 24 | r0 = READ_ONCE(*x); | ||||
| 25 | } | ||||
| 26 | |||||
| 27 | exists (y=2 /\ 1:r0=0) | ||||