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Diffstat (limited to 'tools/memory-model/litmus-tests/R+fencembonceonces.litmus')
| -rw-r--r-- | tools/memory-model/litmus-tests/R+fencembonceonces.litmus | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/tools/memory-model/litmus-tests/R+fencembonceonces.litmus b/tools/memory-model/litmus-tests/R+fencembonceonces.litmus new file mode 100644 index 000000000..222a0b850 --- /dev/null +++ b/tools/memory-model/litmus-tests/R+fencembonceonces.litmus @@ -0,0 +1,30 @@ +C R+fencembonceonces + +(* + * Result: Never + * + * This is the fully ordered (via smp_mb()) version of one of the classic + * counterintuitive litmus tests that illustrates the effects of store + * propagation delays. Note that weakening either of the barriers would + * cause the resulting test to be allowed. + *) + +{} + +P0(int *x, int *y) +{ + WRITE_ONCE(*x, 1); + smp_mb(); + WRITE_ONCE(*y, 1); +} + +P1(int *x, int *y) +{ + int r0; + + WRITE_ONCE(*y, 2); + smp_mb(); + r0 = READ_ONCE(*x); +} + +exists (y=2 /\ 1:r0=0) |