X>ReactOS-0.3.6\ntoskrnl\ex\uuid.c
X>-----------------------------------------------------
X>NTSTATUS
X>NTAPI
X>NtAllocateUuids(OUT PULARGE_INTEGER Time,
X>                OUT PULONG Range,
X>                OUT PULONG Sequence,
X>                OUT PUCHAR Seed)
X>{
X>    ULARGE_INTEGER IntTime;
X>    ULONG IntRange;
X>    NTSTATUS Status;

X>    PAGED_CODE();

X>    ExAcquireFastMutex(&UuidMutex);

X>    if (!UuidSequenceInitialized)
X>    {
X>        Status = ExpLoadUuidSequence(&UuidSequence);
X>        if (NT_SUCCESS(Status))
X>        {
X>            UuidSequence++;
X>        }
X>        else
X>        {
X>            ExpGetRandomUuidSequence(&UuidSequence);
X>        }

X>        UuidSequenceInitialized = TRUE;
X>        UuidSequenceChanged = TRUE;
X>    }

X>    Status = ExpCreateUuids(&IntTime,
X>                            &IntRange,
X>                            &UuidSequence);
X>    if (!NT_SUCCESS(Status))
X>    {
X>        ExReleaseFastMutex(&UuidMutex);
X>        return Status;
X>    }

X>    if (UuidSequenceChanged)
X>    {
X>        Status = ExpSaveUuidSequence(&UuidSequence);
X>        if (NT_SUCCESS(Status))
X>            UuidSequenceChanged = FALSE;
X>    }

X>    ExReleaseFastMutex(&UuidMutex);

    Time->>QuadPart = IntTime.QuadPart;
X>    *Range = IntRange;
X>    *Sequence = UuidSequence;

X>    RtlCopyMemory(Seed,
X>                  UuidSeed,
X>                  SEED_BUFFER_SIZE);

X>    return STATUS_SUCCESS;
X>}
X>