throw new UnsupportedOperationException();
    }

    public IdGenerator<?> getIdGenerator() {
        return new LongIdGenerator();
    }

    @Inject
    public Clock getClock() {
        throw new UnsupportedOperationException();
    }

    @Inject
    public Clock getTimeProvider() {
        throw new UnsupportedOperationException();
    }

    @Override

)

// local lock servers
var globalLockServer *localLocker

// RWLocker - locker interface to introduce GetRLock, RUnlock.
type RWLocker interface {
	GetLock(ctx context.Context, timeout *dynamicTimeout) (lkCtx LockContext, timedOutErr error)
	Unlock(lkCtx LockContext)
	GetRLock(ctx context.Context, timeout *dynamicTimeout) (lkCtx LockContext, timedOutErr error)
	RUnlock(lkCtx LockContext)
}

public abstract class BlockPayload {
    private Block block;

    public Block getBlock() {
        return block;
    }

    public void setBlock(Block block) {
        this.block = block;
    }

    public BlockPointer getPos() {
        return getBlock().getPos();
    }

    public BlockPointer getNextPos() {
        return getBlock().getNextPos();
    }

    protected abstract int getSize();

func testSimpleWriteLock(t *testing.T, duration time.Duration) (locked bool) {
	ctx := context.Background()
	lrwm := NewLRWMutex()

	if !lrwm.GetRLock(ctx, "", "object1", time.Second) {
		panic("Failed to acquire read lock")
	}
	// fmt.Println("1st read lock acquired, waiting...")

	if !lrwm.GetRLock(ctx, "", "object1", time.Second) {
		panic("Failed to acquire read lock")
	}
	// fmt.Println("2nd read lock acquired, waiting...")

	ctx1, cancel1 := context.WithCancel(context.Background())
	if !drwm1.GetRLock(ctx1, cancel1, id, source, Options{Timeout: time.Second}) {
		panic("Failed to acquire read lock")
	}
	// fmt.Println("1st read lock acquired, waiting...")

	drwm2 := NewDRWMutex(ds, "simplelock")
	ctx2, cancel2 := context.WithCancel(context.Background())
	if !drwm2.GetRLock(ctx2, cancel2, id, source, Options{Timeout: time.Second}) {

func (lm *LRWMutex) RLock() {
	const isWriteLock = false
	lm.lockLoop(context.Background(), lm.id, lm.source, 1<<63-1, isWriteLock)
}

// GetRLock tries to get a read lock on lm before the timeout occurs.
func (lm *LRWMutex) GetRLock(ctx context.Context, id string, source string, timeout time.Duration) (locked bool) {
	const isWriteLock = false
	return lm.lockLoop(ctx, id, source, timeout, isWriteLock)
}

        nextBlock = 0;
    }

    @Override
    public void attach(BlockPayload block) {
        if (block.getBlock() == null) {
            block.setBlock(new BlockImpl(block));
        }
    }

    @Override
    public void remove(BlockPayload block) {
        BlockImpl blockImpl = (BlockImpl) block.getBlock();
        blockImpl.detach();
    }

    @Override
    public void flush() {
    }

};

// Checks if `op` is nested in `block`.
bool OpInBlock(Operation* op, Block* block) {
  Block* op_block = op->getBlock();
  while (op_block) {
    if (op_block == block) return true;
    if (auto* parent_op = op_block->getParentOp()) {
      op_block = parent_op->getBlock();
    } else {
      break;
    }
  }
  return false;
}

      }
      // We treat block arguments of inner blocks as "results", too, in
      // the sense that they're values produced inside this op.
      for (Region& region : op->getRegions()) {
        for (Block& block : region.getBlocks()) {
          for (BlockArgument& arg : block.getArguments()) {
            all_internal_results.insert(arg);
          }
        }
      }
    });
  }

    if (!llvm::hasSingleElement(block->getParent()->getBlocks()))
      return op->emitOpError() << "expects single block region ancestor(s)";

    control_flow_ops.insert(parent);
    control_flow_blocks.insert(block);

    parent = block->getParentOp();
    block = parent->getBlock();
  }
  return success();
}