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Diffstat (limited to '')
-rw-r--r-- | tools/memory-model/litmus-tests/IRIW+fencembonceonces+OnceOnce.litmus | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/tools/memory-model/litmus-tests/IRIW+fencembonceonces+OnceOnce.litmus b/tools/memory-model/litmus-tests/IRIW+fencembonceonces+OnceOnce.litmus new file mode 100644 index 000000000..e729d2776 --- /dev/null +++ b/tools/memory-model/litmus-tests/IRIW+fencembonceonces+OnceOnce.litmus @@ -0,0 +1,45 @@ +C IRIW+fencembonceonces+OnceOnce + +(* + * Result: Never + * + * Test of independent reads from independent writes with smp_mb() + * between each pairs of reads. In other words, is smp_mb() sufficient to + * cause two different reading processes to agree on the order of a pair + * of writes, where each write is to a different variable by a different + * process? This litmus test exercises LKMM's "propagation" rule. + *) + +{} + +P0(int *x) +{ + WRITE_ONCE(*x, 1); +} + +P1(int *x, int *y) +{ + int r0; + int r1; + + r0 = READ_ONCE(*x); + smp_mb(); + r1 = READ_ONCE(*y); +} + +P2(int *y) +{ + WRITE_ONCE(*y, 1); +} + +P3(int *x, int *y) +{ + int r0; + int r1; + + r0 = READ_ONCE(*y); + smp_mb(); + r1 = READ_ONCE(*x); +} + +exists (1:r0=1 /\ 1:r1=0 /\ 3:r0=1 /\ 3:r1=0) |