百科狗Atomics.waitAsync() - JavaScript Atomics 对象
Atomics.waitAsync()
静态Atomics.waitAsync()方法在共享内存位置上异步等待，并返回Promise。
与Atomics.wait(),waitAsync是非阻塞的，可以在主线程上使用
注意：此操作仅适用于共享的Int32Array或BigInt64Array。
语法
Atomics.waitAsync(typedArray, index, value) Atomics.waitAsync(typedArray, index, value, timeout)
Parameters
typedArrayA sharedInt32ArrayorBigInt64Array.
indexThe position in thetypedArrayto wait on.
valueThe expected value to test.
timeoutOptionalTime to wait in milliseconds.Infinity, if no time is provided.
Return value
AnObjectwith the following properties:
asyncA boolean indicating whether thevalueproperty is aPromiseor not.
valueIfasyncisfalse, it will be a string which is either"not-equal"or"timed-out"(only when thetimeoutparameter is0). Ifasyncistrue, it will be aPromisewhich is fulfilled with a string value, either"ok"or"timed-out". The promise is never rejected.
Examples
Given a sharedInt32Array.
const sab = new SharedArrayBuffer(1024); const int32 = new Int32Array(sab);
A reading thread is sleeping and waiting on location 0 which is expected to be 0. Theresult.valuewill be a promise.
const result = Atomics.waitAsync(int32, 0, 0, 1000);
// { async: true, value: Promise {} }
In the reading thread or in another thread, the memory location 0 is called and the promise can be resolved with"ok".
Atomics.notify(int32, 0);
// { async: true, value: Promise {: 'ok'} }
If it isn't resolving to"ok", the value in the shared memory location wasn't the expected(thevaluewould be"not-equal"instead of a promise)or the timeout was reached(the promise will resolve to"time-out").
