HarmonyOS 应用并发同步的样例代码

@Concurrent 
function transferAtomics(arg1: Int32Array) { 
  console.info("=== wait begin::"); 
  // 使用Atomics进行操作 
  while (true) { 
    // 请求秘钥 
    const oldValue = Atomics.compareExchange(arg1, 0, 0, 1); 
    if (oldValue === 0) { 
      break; 
    } 
    Atomics.wait(arg1, 0, 1, 3000) 
  } 
  let res = true; 
  console.info("=== wait end::"); 
  return res; 
} 
 
 
@Entry 
@Component 
struct Index { 
  @State message: string = 'Hello World'; 
 
  build() { 
    Row() { 
      Column() { 
        Button(this.message) 
          .fontSize(50) 
          .fontWeight(FontWeight.Bold) 
          .onClick(() => { 
            let sab: SharedArrayBuffer = new SharedArrayBuffer(20); 
            let int32 = new Int32Array(sab); 
            let task: taskpool.Task = new taskpool.Task(transferAtomics, int32); 
            let task2: taskpool.Task = new taskpool.Task(transferAtomics, int32); 
            taskpool.execute(task).then((res) => { 
              console.info("=== this res is: " + res); 
            }); 
            taskpool.execute(task2).then((res) => { 
              console.info("=== this res2 is: " + res); 
            }); 
            setTimeout(() => { 
              Atomics.compareExchange(int32, 0, 1, 0); 
            }, 20000); 
          }) 
      } 
      .width('100%') 
    } 
    .height('100%') 
  } 
}
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