code: private boolean isStreamBlocked()
      {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
          {
              SibTr.entry(this, tc, "isStreamBlocked");
              SibTr.exit(tc, "isStreamBlocked", new Object[] { Boolean.valueOf(isStreamBlocked),
                                                              Long.valueOf(linkBlockingTick) });
          }
          return this.isStreamBlocked;
  
      }
docs: Is the stream marked as blocked.
  
  @return true if the stream is blocked.