Add write barriers to PG classes #518
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Write barrier protected objects are allowed to be promoted to the old generation, which means they only get marked on major GC. The downside is that the RB_BJ_WRITE macro MUST be used to set references, otherwise the referenced object may be garbaged collected.
They are not likely to be promoted to old generation, but it can be allowed without any effort.
Also fix a double usage of notice_receiver and notice_processor VALUEs that was introduced in commit d9a9297 9 years ago. This didn't show up, since no one uses both notice_receiver and notice_processor at the same connection.
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Write barrier protected objects are allowed to be promoted to the old generation, which means they only get marked on major GC. The downside is that the RB_BJ_WRITE macro MUST be used to set references, otherwise the referenced object may be garbaged collected.