48 lines
1.9 KiB
JavaScript
48 lines
1.9 KiB
JavaScript
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// Copyright 2024 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// Flags: --harmony-struct --allow-natives-syntax --expose-gc
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(function TestAsyncWait() {
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let mutex = new Atomics.Mutex;
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let cv = new Atomics.Condition;
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let notified = false;
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let locked = Atomics.Mutex.lockAsync(mutex, async function() {
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await Atomics.Condition.waitAsync(cv, mutex);
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// There is only one waiter in this isolate's async waiter list, even though
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// the lock has been taked 2 times (once in the lockAsync and once after the
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// wait was notified).
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assertEquals(1, %AtomicsSychronizationNumAsyncWaitersInIsolateForTesting());
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notified = true;
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});
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// The lock is held, but the callback is not executed until the next
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// microtask.
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assertFalse(Atomics.Mutex.tryLock(mutex, function() {}).success);
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// Call gc to test that everything is kept alive while the lock is taken.
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gc();
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setTimeout(() => {
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// The lock callback has been executed and the condition variable
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// queued one waiter, and the lock is released.
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assertEquals(1, %AtomicsSynchronizationPrimitiveNumWaitersForTesting(cv));
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// The condition variable waiters was added to this isolate's async waiter
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// list and the mutex waiter is still in the list.
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assertEquals(2, %AtomicsSychronizationNumAsyncWaitersInIsolateForTesting());
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assertTrue(Atomics.Mutex.tryLock(mutex, function() {}).success);
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Atomics.Condition.notify(cv, 1);
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// The notification task has been posted, but the execution will continue
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// in the next microtask.
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assertFalse(notified);
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setTimeout(() => {
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assertTrue(notified);
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// The waiter was removed from this isolate's async waiters list.
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assertEquals(
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0, %AtomicsSychronizationNumAsyncWaitersInIsolateForTesting());
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}, 0);
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}, 0);
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})();
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