---
title: THREAD_CALL_OPTIONS_ONCE
framework: Kernel
role: symbol
role_heading: Enumeration Case
platforms: [macOS 10.13+]
path: kernel/2869838-anonymous/thread_call_options_once
---

# THREAD_CALL_OPTIONS_ONCE

## Declaration

```occ
THREAD_CALL_OPTIONS_ONCE = 0x00000001
```