---
title: kIOTimerEventSourceOptionsPriorityMask
framework: Kernel
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.13+]
path: kernel/2870311-anonymous/kiotimereventsourceoptionsprioritymask
---

# kIOTimerEventSourceOptionsPriorityMask

## Declaration

```occ
kIOTimerEventSourceOptionsPriorityMask = 0x000000ff
```