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Test Info:
/* Any copyright is dedicated to the Public Domain.
ChromeUtils.defineESModuleGetters(this, {
DeferredTask: "resource://gre/modules/DeferredTask.sys.mjs",
});
/**
* Checks that the "finalize" method allows the callback to be GC'd.
*/
add_task(async function test_finalize_after_arm() {
let count = 0;
let callback = () => {
++count;
};
let callbackWeakRef = Cu.getWeakReference(callback);
let deferredTask = new DeferredTask(
callback,
/* delayMs */ 600_000, // long timeout, we are not going to wait for it.
/* idleTimeoutMs */ undefined // no deadline.
);
// Clear callback reference, so that we are not the ones keeping it alive.
callback = null;
Cu.forceGC();
ok(callbackWeakRef.get(), "Callback not GC'd yet");
deferredTask.arm();
equal(count, 0, "callback not called yet");
await deferredTask.finalize();
equal(count, 1, "callback force called by finalize");
Cu.forceGC();
ok(!callbackWeakRef.get(), "Callback GC'd after finalize");
// Make sure to reference deferredTask so that there is still a strong
// reference to deferredTask, which prevents deferredTask from trivially
// being collected.
Assert.throws(
() => deferredTask.finalize(),
/The object has been already finalized/,
"finalize() cannot be called twice"
);
});
add_task(async function test_gc_without_arm_or_finalize() {
let count = 0;
let callback = () => {
++count;
};
let callbackWeakRef = Cu.getWeakReference(callback);
let deferredTask = new DeferredTask(
callback,
/* delayMs */ 600_000, // long timeout, we are not going to wait for it.
/* idleTimeoutMs */ undefined // no deadline.
);
// Clear callback reference, so that we are not the ones keeping it alive.
callback = null;
let deferredTaskWeakRef = Cu.getWeakReference(deferredTask);
deferredTask = null;
Cu.forceGC();
ok(!deferredTaskWeakRef.get(), "DeferredTask can be GC'd when not armed");
ok(!callbackWeakRef.get(), "Callback GC'd when DeferredTask is GC'd");
equal(count, 0, "callback was never called");
});