62 lines
2.4 KiB
JavaScript
62 lines
2.4 KiB
JavaScript
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// Copyright 2018 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Check for correct interleaving of Promises and async/await
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(function () {
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const iterations = 10;
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let promiseCounter = iterations;
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let awaitCounter = 0;
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async function check(v) {
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awaitCounter = v;
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// The following checks ensure that "await" takes 3 ticks on the
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// microtask queue. Note: this will change in the future
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if (awaitCounter === 0) {
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assertEquals(iterations, promiseCounter);
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} else if (awaitCounter <= Math.floor(iterations / 3)) {
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assertEquals(iterations - awaitCounter * 3, promiseCounter);
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} else {
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assertEquals(0, promiseCounter);
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}
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}
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async function f() {
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for (let i = 0; i < iterations; i++) {
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await check(i);
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}
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return 0;
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}
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function countdown(v) {
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promiseCounter = v;
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if (v > 0) Promise.resolve(v - 1).then(countdown);
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}
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countdown(iterations);
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f();
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})();
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