Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | 127x 127x 39x 88x 127x | import 'setimmediate';
import { makePromiseKit } from '@endo/promise-kit';
// Note: This can only be imported from the Start Compartment, where the tricks
// used by the 'setimmediate' package are available.
/**
* Return a promise that waits until the microtask queue is empty. When this
* promise resolves, the holder can be assured that the environment no longer
* has agency.
*
* @param delay - Optional delay (in ms) to wait for things to catch up.
*
* @returns a Promise that can await the compartment becoming quiescent.
*/
export async function waitUntilQuiescent(delay: number = 0): Promise<void> {
// the delivery might cause some number of (native) Promises to be
// created and resolved, so we use the IO queue to detect when the
// Promise queue is empty. The IO queue (setImmediate and setTimeout) is
// lower-priority than the Promise queue on browsers.
const { promise: queueEmptyP, resolve } = makePromiseKit<void>();
if (delay > 0) {
setTimeout(() => resolve(), delay);
} else {
setImmediate(() => resolve());
}
return queueEmptyP;
}
|