1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
| C WRC+pooncerelease+fencermbonceonce+Once
|
| (*
| * Result: Never
| *
| * This litmus test is an extension of the message-passing pattern, where
| * the first write is moved to a separate process. Because it features
| * a release and a read memory barrier, it should be forbidden. More
| * specifically, this litmus test is forbidden because smp_store_release()
| * is A-cumulative in LKMM.
| *)
|
| {}
|
| P0(int *x)
| {
| WRITE_ONCE(*x, 1);
| }
|
| P1(int *x, int *y)
| {
| int r0;
|
| r0 = READ_ONCE(*x);
| smp_store_release(y, 1);
| }
|
| P2(int *x, int *y)
| {
| int r0;
| int r1;
|
| r0 = READ_ONCE(*y);
| smp_rmb();
| r1 = READ_ONCE(*x);
| }
|
| exists (1:r0=1 /\ 2:r0=1 /\ 2:r1=0)
|
|
