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// META: script=/common/gc.js
// META: script=resources/maybe-garbage-collect.js
// ├──> maybeGarbageCollectAndCleanupAsync
// └──> resolveGarbageCollection
/*---
esid: sec-properties-of-the-finalization-registry-constructor
---*/
let called = 0;
let endOfCall = 0;
let finalizationRegistry = new FinalizationRegistry(function() {});
function callback(holding) {
called += 1;
if (called === 1) {
// Atempt to re-enter the callback.
let nestedCallbackRan = false;
finalizationRegistry.cleanupSome(() => { nestedCallbackRan = true });
assert_equals(nestedCallbackRan, true);
}
endOfCall += 1;
}
function emptyCells() {
let o1 = {};
let o2 = {};
// Register more than one objects to test reentrancy.
finalizationRegistry.register(o1, 'holdings 1');
finalizationRegistry.register(o2, 'holdings 2');
let prom = maybeGarbageCollectAndCleanupAsync(o1);
o1 = null;
return prom;
}
promise_test(() => {
return (async () => {
assert_implements(
typeof FinalizationRegistry.prototype.cleanupSome === 'function',
'FinalizationRegistry.prototype.cleanupSome is not implemented.'
);
await emptyCells();
finalizationRegistry.cleanupSome(callback);
assert_equals(called, 1, 'callback was called');
assert_equals(endOfCall, 1, 'callback finished');
})().catch(resolveGarbageCollection);
}, 'cleanupCallback has only one optional chance to be called for a GC that cleans up a registered target.');
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