public static TXLockService createDTLS(InternalDistributedSystem system) {
    synchronized (TXLockService.class) {
      if (DTLS == null || DTLS.isDestroyed()) {
        DTLS = new TXLockServiceImpl(DLockService.DTLS, system);
      }
      return DTLS;
    }
  }
Returns (or creates) the instance of the distributed TXLockService
geode-core/src/main/java/org/apache/geode/internal/cache/locks/TXLockService.java