I'm porting an application that is using SpiderMonkey for embedding, and I
have a few questions.
One of the things my application does is, it allows user (in javascript) to
register for events:
func handler(...) { {}
registerEventHandler("evetName", handler);
In C++, I then store these handlers to be called later once the event
arrives.
Once the event arrives (different thread than isolate is running on), I
store it in a pending event list for the runtime (isolate), I then
call JS_RequestInterruptCallback which interrupts the execution of the
runtime (isolate), and drops into my C++ interrupt callback.
>From my C++ callback, I check for pending events, and call the user
provided functions (re-entering the isolate) delivering the events, and
resume execution to the user.
Seems that with v8, I can get quite close to this, except
isolate->RequestInterrupt does not allow re-entering the isolate/calling
user code, making this not work.
I tried using EnqueueMicrotask but seems those are never delivered
automatically unless the script stops, or I call PerformMicrotaskCheckpoint
(which then ends up on the wrong, calling thread)
I tried posting a task to the platform
(platform->GetForegroundTaskRunner(isolate)->PostTask), but given the
script is long lived, I don't think this ever gets delivered.
I tried using Locker(isolate) + Isolate::Scope(isolate)
+ isolate->GetCurrentContext() from the event thread, and then calling the
callbacks, but this crashes non-deterministically, sometimes with "Invoke
in DisallowJavascriptExecutionScope".
Any guidance is appreciated.
Thanks.
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