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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/memory-model/litmus-tests/LB+fencembonceonce+ctrlonceonce.litmus | |
parent | Initial commit. (diff) | |
download | linux-430c2fc249ea5c0536abd21c23382884005c9093.tar.xz linux-430c2fc249ea5c0536abd21c23382884005c9093.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/memory-model/litmus-tests/LB+fencembonceonce+ctrlonceonce.litmus')
-rw-r--r-- | tools/memory-model/litmus-tests/LB+fencembonceonce+ctrlonceonce.litmus | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/tools/memory-model/litmus-tests/LB+fencembonceonce+ctrlonceonce.litmus b/tools/memory-model/litmus-tests/LB+fencembonceonce+ctrlonceonce.litmus new file mode 100644 index 000000000..4727f5aaf --- /dev/null +++ b/tools/memory-model/litmus-tests/LB+fencembonceonce+ctrlonceonce.litmus @@ -0,0 +1,34 @@ +C LB+fencembonceonce+ctrlonceonce + +(* + * Result: Never + * + * This litmus test demonstrates that lightweight ordering suffices for + * the load-buffering pattern, in other words, preventing all processes + * reading from the preceding process's write. In this example, the + * combination of a control dependency and a full memory barrier are enough + * to do the trick. (But the full memory barrier could be replaced with + * another control dependency and order would still be maintained.) + *) + +{} + +P0(int *x, int *y) +{ + int r0; + + r0 = READ_ONCE(*x); + if (r0) + WRITE_ONCE(*y, 1); +} + +P1(int *x, int *y) +{ + int r0; + + r0 = READ_ONCE(*y); + smp_mb(); + WRITE_ONCE(*x, 1); +} + +exists (0:r0=1 /\ 1:r0=1) |