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Diffstat (limited to '')
| -rw-r--r-- | Documentation/litmus-tests/atomic/cmpxchg-fail-ordered-2.litmus | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/Documentation/litmus-tests/atomic/cmpxchg-fail-ordered-2.litmus b/Documentation/litmus-tests/atomic/cmpxchg-fail-ordered-2.litmus new file mode 100644 index 0000000000..5c06054f46 --- /dev/null +++ b/Documentation/litmus-tests/atomic/cmpxchg-fail-ordered-2.litmus @@ -0,0 +1,30 @@ +C cmpxchg-fail-ordered-2 + +(* + * Result: Never + * + * Demonstrate use of smp_mb__after_atomic() to make a failing cmpxchg + * operation have acquire ordering. + *) + +{} + +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); + smp_mb__after_atomic(); + r2 = READ_ONCE(*x); +} + +exists (0:r1=0 /\ 1:r1=1 /\ 1:r2=0) |