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