diff options
Diffstat (limited to 'tools/memory-model')
| -rw-r--r-- | tools/memory-model/litmus-tests/ISA2+pooncelock+pooncelock+pombonce.litmus | 41 |
1 files changed, 41 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 000000000000..7a39a0aaa976 --- /dev/null +++ b/tools/memory-model/litmus-tests/ISA2+pooncelock+pooncelock+pombonce.litmus @@ -0,0 +1,41 @@ +C ISA2+pooncelock+pooncelock+pombonce.litmus + +(* + * Result: Sometimes + * + * This test shows that the ordering provided by a lock-protected S + * litmus test (P0() and P1()) are not visible to external process P2(). + * This is likely to change soon. + *) + +{} + +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) |