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Diffstat (limited to 'tools/memory-model/litmus-tests/MP+unlocklockonceonce+fencermbonceonce.litmus')
| -rw-r--r-- | tools/memory-model/litmus-tests/MP+unlocklockonceonce+fencermbonceonce.litmus | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/tools/memory-model/litmus-tests/MP+unlocklockonceonce+fencermbonceonce.litmus b/tools/memory-model/litmus-tests/MP+unlocklockonceonce+fencermbonceonce.litmus new file mode 100644 index 000000000000..2feb1398be71 --- /dev/null +++ b/tools/memory-model/litmus-tests/MP+unlocklockonceonce+fencermbonceonce.litmus @@ -0,0 +1,33 @@ +C MP+unlocklockonceonce+fencermbonceonce + +(* + * Result: Never + * + * If two locked critical sections execute on the same CPU, stores in the + * first must propagate to each CPU before stores in the second do, even if + * the critical sections are protected by different locks. + *) + +{} + +P0(spinlock_t *s, spinlock_t *t, int *x, int *y) +{ + spin_lock(s); + WRITE_ONCE(*x, 1); + spin_unlock(s); + spin_lock(t); + WRITE_ONCE(*y, 1); + spin_unlock(t); +} + +P1(int *x, int *y) +{ + int r1; + int r2; + + r1 = READ_ONCE(*y); + smp_rmb(); + r2 = READ_ONCE(*x); +} + +exists (1:r1=1 /\ 1:r2=0) |