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Diffstat (limited to '')
-rw-r--r-- | tools/memory-model/litmus-tests/ISA2+pooncelock+pooncelock+pombonce.litmus | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/tools/memory-model/litmus-tests/ISA2+pooncelock+pooncelock+pombonce.litmus b/tools/memory-model/litmus-tests/ISA2+pooncelock+pooncelock+pombonce.litmus new file mode 100644 index 000000000..094d58df7 --- /dev/null +++ b/tools/memory-model/litmus-tests/ISA2+pooncelock+pooncelock+pombonce.litmus @@ -0,0 +1,40 @@ +C ISA2+pooncelock+pooncelock+pombonce + +(* + * Result: Never + * + * This test shows that write-write ordering provided by locks + * (in P0() and P1()) is visible to external process P2(). + *) + +{} + +P0(int *x, int *y, spinlock_t *mylock) +{ + spin_lock(mylock); + WRITE_ONCE(*x, 1); + WRITE_ONCE(*y, 1); + spin_unlock(mylock); +} + +P1(int *y, int *z, spinlock_t *mylock) +{ + int r0; + + spin_lock(mylock); + r0 = READ_ONCE(*y); + WRITE_ONCE(*z, 1); + spin_unlock(mylock); +} + +P2(int *x, int *z) +{ + int r1; + int r2; + + r2 = READ_ONCE(*z); + smp_mb(); + r1 = READ_ONCE(*x); +} + +exists (1:r0=1 /\ 2:r2=1 /\ 2:r1=0) |