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
39
40
41
42
43
| C IRIW+poonceonces+OnceOnce
|
| (*
| * Result: Sometimes
| *
| * Test of independent reads from independent writes with nothing
| * between each pairs of reads. In other words, is anything at all
| * needed to cause two different reading processes to agree on the order
| * of a pair of writes, where each write is to a different variable by a
| * different process?
| *)
|
| {}
|
| P0(int *x)
| {
| WRITE_ONCE(*x, 1);
| }
|
| P1(int *x, int *y)
| {
| int r0;
| int r1;
|
| r0 = READ_ONCE(*x);
| r1 = READ_ONCE(*y);
| }
|
| P2(int *y)
| {
| WRITE_ONCE(*y, 1);
| }
|
| P3(int *x, int *y)
| {
| int r0;
| int r1;
|
| r0 = READ_ONCE(*y);
| r1 = READ_ONCE(*x);
| }
|
| exists (1:r0=1 /\ 1:r1=0 /\ 3:r0=1 /\ 3:r1=0)
|
|
