Thread Control

Note:

Currently in the beta phase.

Background

During the development of OpenHarmony applications in Cangjie, the code logic is primarily divided into two parts: UI-related logic code and UI-independent logic code.

• UI-related logic code: Includes UI layout description code, UI state declaration, and modification code.
• UI-independent logic code: All other code excluding UI-related logic code.

UI-related logic code must run on the UI thread, which possesses an independent OS thread, while UI-independent logic code can run on any OS thread. Since Cangjie code runs on Cangjie user-mode threads without explicit binding to OS threads, there is no guarantee that UI logic code will execute on the UI thread, potentially leading to application lag and security risks.

Development Paradigm

Supports specifying code logic that can be custom-scheduled to run on either the UI thread or non-UI threads.

Import Module

import kit.ArkUI.*

let UIThread

public let UIThread: MainThreadContext = MainThreadContext.instance_

Function: UI thread context instance.

Type: MainThreadContext

Read/Write Permission: Read-only

System Capability: SystemCapability.ArkUI.ArkUI.Full

Since Version: 22

func launch(() -> Unit)

public func launch(task: () -> Unit): Unit

Function: Submits a task to the main thread for execution.

System Capability: SystemCapability.ArkUI.ArkUI.Full

Since Version: 22

Parameters:

Parameter	Type	Required	Default	Description
task	() -> Unit	Yes	-	The task to execute.

class MainThreadContext

public class MainThreadContext <: ThreadContext {}

Function: Main thread context class.

System Capability: SystemCapability.ArkUI.ArkUI.Full

Since Version: 22

Parent Type:

• ThreadContext