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
| C SB+rfionceonce-poonceonces
|
| (*
| * Result: Sometimes
| *
| * This litmus test demonstrates that LKMM is not fully multicopy atomic.
| *)
|
| {}
|
| P0(int *x, int *y)
| {
| int r1;
| int r2;
|
| WRITE_ONCE(*x, 1);
| r1 = READ_ONCE(*x);
| r2 = READ_ONCE(*y);
| }
|
| P1(int *x, int *y)
| {
| int r3;
| int r4;
|
| WRITE_ONCE(*y, 1);
| r3 = READ_ONCE(*y);
| r4 = READ_ONCE(*x);
| }
|
| locations [0:r1; 1:r3; x; y] (* Debug aid: Print things not in "exists". *)
| exists (0:r2=0 /\ 1:r4=0)
|
|
