Modifies a pointer to point to a new mini-object. The modification is done atomically, and the reference counts are updated correctly. Either newdata and the value pointed to by olddata may be NULL.
pointer to a pointer to a mini-object to be replaced
pointer to new mini-object
See Implementation
Modifies a pointer to point to a new mini-object. The modification is done atomically, and the reference counts are updated correctly. Either newdata and the value pointed to by olddata may be NULL.