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-rw-r--r--src/gc.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/src/gc.c b/src/gc.c
index c8e7a4646..0a93993a2 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -63,12 +63,13 @@
== Write Barrier
- mruby implementer and C extension library writer must write a write
- barrier when writing a pointer to an object on object's field.
- Two different write barrier are available:
+ mruby implementer and C extension library writer must insert a write
+ barrier when updating a reference from a field of an object.
+ When updating a reference from a field of object A to object B,
+ two different types of write barrier are available:
- * mrb_field_write_barrier
- * mrb_write_barrier
+ * mrb_field_write_barrier - target B object for a mark.
+ * mrb_write_barrier - target A object for a mark.
== Generational Mode