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Justin Ethier 2016-01-21 22:43:42 -05:00
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docs/Garbage-Collector.md
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@ -165,14 +165,20 @@ The collector swaps the values of the clear color (white) and the mark color (bl
### Mark ### Mark
The collector transitions to sync 2 and then async. At this point it marks the global variables and waits for the mutators to also transition to async. The collector transitions to sync 2 and then async. At this point it marks the global variables and waits for the mutators to also transition to async.
<img src="images/gc-graph-mark.png" alt="Initial object graph">
### Trace ### Trace
The collector finds all live objects using a breadth-first search and marks them black. The collector finds all live objects using a breadth-first search and marks them black.
<img src="images/gc-graph-trace.png" alt="Initial object graph">
### Sweep ### Sweep
The collector scans the heap and frees memory used by all white objects. If the heap is still low on memory at this point the heap will be increased in size. The collector scans the heap and frees memory used by all white objects. If the heap is still low on memory at this point the heap will be increased in size.
Also, to ensure a complete collection data for any terminated threads is not freed until now. Also, to ensure a complete collection data for any terminated threads is not freed until now.
<img src="images/gc-graph-sweep.png" alt="Initial object graph">
### Resting ### Resting
The collector cycle is complete and it rests until it is triggered again. The collector cycle is complete and it rests until it is triggered again.