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C cmpxchg-fail-unordered-2
(*
* Result: Sometimes
*
* Demonstrate that a failing cmpxchg() operation does not act as either
* an acquire release operation. (In contrast, a successful cmpxchg()
* does act as both an acquire and a release operation.)
*)
{}
P0(int *x, int *y)
{
int r1;
WRITE_ONCE(*x, 1);
r1 = cmpxchg(y, 0, 1);
}
P1(int *x, int *y)
{
int r1;
int r2;
r1 = cmpxchg(y, 0, 1);
r2 = READ_ONCE(*x);
}
exists (0:r1=0 /\ 1:r1=1 /\ 1:r2=0)
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