| 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) |