Write barrier (WB) interfaces:

Macros
#define	RB_OBJ_WRITE(old, slot, young)    RBIMPL_CAST(rb_obj_write((VALUE)(old), (VALUE *)(slot), (VALUE)(young), __FILE__, __LINE__))
	Declaration of a "back" pointer.
#define	RB_OBJ_WRITTEN(old, oldv, young)    RBIMPL_CAST(rb_obj_written((VALUE)(old), (VALUE)(oldv), (VALUE)(young), __FILE__, __LINE__))
	Identical to RB_OBJ_WRITE(), except it doesn't write any values, but only a WB declaration.

Detailed Description

Note

The following core interfaces can be changed in the future. Please catch up if you want to insert WB into C-extensions correctly.

Macro Definition Documentation

RB_OBJ_WRITE

#define RB_OBJ_WRITE	(		old,
			slot,
			young
	)		RBIMPL_CAST(rb_obj_write((VALUE)(old), (VALUE *)(slot), (VALUE)(young), __FILE__, __LINE__))

Declaration of a "back" pointer.

This is a write barrier for new reference from "old" generation to "young" generation. It writes young into *slot, which is a pointer inside of old.

Parameters

[in]	old	An old object.
[in]	slot	A pointer inside of old.
[out]	young	A young object.

Definition at line 603 of file gc.h.

RB_OBJ_WRITTEN

#define RB_OBJ_WRITTEN	(		old,
			oldv,
			young
	)		RBIMPL_CAST(rb_obj_written((VALUE)(old), (VALUE)(oldv), (VALUE)(young), __FILE__, __LINE__))

Identical to RB_OBJ_WRITE(), except it doesn't write any values, but only a WB declaration.

oldv is replaced value with b (not used in current Ruby).

Parameters

[in]	old	An old object.
[in]	oldv	An object previously stored inside of old.
[out]	young	A young object.

Definition at line 615 of file gc.h.