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// |reftest| skip-if(!this.hasOwnProperty('FinalizationRegistry')) async -- FinalizationRegistry is not enabled unconditionally
// Copyright (C) 2019 Mathieu Hofman. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-finalization-registry.prototype.unregister
description: >
Cannot unregister a cell referring to an Object that has been cleaned up
info: |
FinalizationRegistry.prototype.cleanupSome ( [ _callback_ ] )
4. Perform ? CleanupFinalizationRegistry(_finalizationRegistry_, _callback_).
CleanupFinalizationRegistry ( _finalizationRegistry_ ):
3. While _finalizationRegistry_.[[Cells]] contains a Record _cell_ such that
_cell_.[[WeakRefTarget]] is ~empty~, then an implementation may perform the
following steps:
a. Choose any such _cell_.
b. Remove _cell_ from _finalizationRegistry_.[[Cells]].
c. Perform ? HostCallJobCallback(_callback_, *undefined*,
« _cell_.[[HeldValue]] »).
FinalizationRegistry.prototype.unregister ( _unregisterToken_ )
4. Let _removed_ be *false*.
5. For each Record { [[WeakRefTarget]], [[HeldValue]], [[UnregisterToken]] }
_cell_ of _finalizationRegistry_.[[Cells]], do
a. If _cell_.[[UnregisterToken]] is not ~empty~ and
SameValue(_cell_.[[UnregisterToken]], _unregisterToken_) is *true*, then
i. Remove _cell_ from _finalizationRegistry_.[[Cells]].
ii. Set _removed_ to *true*.
6. Return _removed_.
features: [FinalizationRegistry.prototype.cleanupSome, FinalizationRegistry, host-gc-required]
includes: [async-gc.js]
flags: [async, non-deterministic]
---*/
var value = 'target!';
var token = {};
var finalizationRegistry = new FinalizationRegistry(function() {});
function emptyCells() {
var target = {};
finalizationRegistry.register(target, value, token);
var prom = asyncGC(target);
target = null;
return prom;
}
emptyCells().then(function() {
var called = 0;
var holdings = [];
finalizationRegistry.cleanupSome(function cb(holding) {
called += 1;
holdings.push(holding);
});
assert.sameValue(called, 1);
assert.sameValue(holdings.length, 1);
assert.sameValue(holdings[0], value);
var res = finalizationRegistry.unregister(token);
assert.sameValue(res, false, 'unregister after iterating over it in cleanup');
}).then($DONE, resolveAsyncGC);
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