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Justin Ethier 2016-02-29 23:09:20 -05:00
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docs/Garbage-Collector.md
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@ -195,9 +195,11 @@ This function is called by a mutator to allocate memory on the heap for an objec
A write barrier is used to ensure any modified objects are properly marked for the current collection cycle. There are two cases: A write barrier is used to ensure any modified objects are properly marked for the current collection cycle. There are two cases:
- Gray the object's new and old values if the mutator is in a synchronous status. Graying of the new value is a special case since it may still be on the stack. Instead of marking it directly, the object is tagged to be grayed when it is relocated to the heap. - Gray the object's new and old values if the mutator is in a synchronous status.
- Gray the object's old value if the collector is in the tracing stage. - Gray the object's old value if the collector is in the tracing stage.
Because updates can occur at any time a modified object may still live on the stack. In this case the object is tagged to be grayed when it is relocated to the heap.
### Cooperate ### Cooperate
Each mutator is required to periodically call this function to cooperate with the collector. During cooperation a mutator will update its status to match the collector's status, to handshake with the collector. Each mutator is required to periodically call this function to cooperate with the collector. During cooperation a mutator will update its status to match the collector's status, to handshake with the collector.