@Concurrent Decorator: Verifying Concurrent Functions

To pass function verification, the concurrent functions executed in a TaskPool must be decorated using @Concurrent.

NOTE

Since API version 9, this decorator is supported in ArkTS widgets.

Decorator Description

@Concurrent Decorator	Description
Decorator parameters	None.
Application scenarios	This decorator can be used only in projects of the stage model.
Decorated function types	This decorator can be used for asynchronous functions and common functions. It cannot be used for generators, arrow functions, or methods. It does not support class member functions or anonymous functions.
Variable types in decorated functions	Local variables, input parameters, and variables imported through import are supported. Closure variables are not allowed.

Example

import taskpool from '@ohos.taskpool';

@Concurrent
function add(num1: number, num2: number): number {
  return num1 + num2;
}

async function ConcurrentFunc(): Promise<void> {
  try {
    let task: taskpool.Task = new taskpool.Task(add, 1, 2);
    console.info("taskpool res is: " + await taskpool.execute(task));
  } catch (e) {
    console.error("taskpool execute error is: " + e);
  }
}

@Entry
@Component
struct Index {
  @State message: string = 'Hello World'

  build() {
    Row() {
      Column() {
        Text(this.message)
          .fontSize(50)
          .fontWeight(FontWeight.Bold)
          .onClick(() => {
            ConcurrentFunc();
          })
      }
      .width('100%')
    }
    .height('100%')
  }
}