# `GSLayer lockReadMetrics`

*Instance Method*

Acquires the read lock for metrics.

## Declaration

```swift
func lockReadMetrics()
```

```objc
- (void) lockReadMetrics;
```

```python
lockReadMetrics()
```

## See Also

### Metrics Locks

- [`GSLayer unlockReadMetrics`](/Core/GlyphsCore/GSLayer/unlockReadMetrics) — Releases the read lock for metrics.
- [`GSLayer lockWriteMetrics`](/Core/GlyphsCore/GSLayer/lockWriteMetrics) — Acquires the write lock for metrics.
- [`GSLayer unlockWriteMetrics`](/Core/GlyphsCore/GSLayer/unlockWriteMetrics) — Releases the write lock for metrics.