---
title: lck_mtx_ext_t
framework: Kernel
role: symbol
role_heading: Type Alias
platforms: [macOS 10.6+]
path: kernel/lck_mtx_ext_t
---

# lck_mtx_ext_t

## Declaration

```occ
typedef struct __lck_mtx_ext_t__ lck_mtx_ext_t;
```