1 C cmpxchg-fail-ordered-1
2
3 (*
4 * Result: Never
5 *
6 * Demonstrate that a failing cmpxchg() operation will act as a full
7 * barrier when followed by smp_mb__after_atomic().
8 *)
9
10 {}
11
12 P0(int *x, int *y, int *z)
13 {
14 int r0;
15 int r1;
16
17 WRITE_ONCE(*x, 1);
18 r1 = cmpxchg(z, 1, 0);
19 smp_mb__after_atomic();
20 r0 = READ_ONCE(*y);
21 }
22
23 P1(int *x, int *y, int *z)
24 {
25 int r0;
26 int r1;
27
28 WRITE_ONCE(*y, 1);
29 r1 = cmpxchg(z, 1, 0);
30 smp_mb__after_atomic();
31 r0 = READ_ONCE(*x);
32 }
33
34 locations[0:r1;1:r1]
35 exists (0:r0=0 /\ 1:r0=0)
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