LibWeb: Queue the task for MessagePort receive in targetPort's realm #2243
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We were delaying sending an IPC message until the HTML PortMessage task was run, but we were not queuing the task in on the receiver side. The result of this was that message port posting was needlessly creating an HTML task just to send an IPC message. On the flip side, we were directly calling dispatch_event from the socket notifier of the target port's message queue. This is a huge problem, because it means that we were effectively running javascript-aware code from an 'in parallel' context. By switching around which side of the IPC interface is responsible for queuing a task, we can avoid problems where a document is destroyed from a port message-attached callback and crashes.
Now more correct than 7ae7b9b
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We were delaying sending an IPC message until the HTML PortMessage
task was run, but we were not queuing the task in on the receiver
side. The result of this was that message port posting was
needlessly creating an HTML task just to send an IPC message.
On the flip side, we were directly calling dispatch_event from the
socket notifier of the target port's message queue. This is a huge
problem, because it means that we were effectively running
javascript-aware code from an 'in parallel' context.
By switching around which side of the IPC interface is responsible
for queuing a task, we can avoid problems where a document is
destroyed from a port message-attached callback and crashes.
This fixes the crash in #2242