shadow_free
unsigned long shadow_free;
unsigned long free = rinfo->shadow_free;
rinfo->shadow_free = rinfo->shadow[free].req.u.rw.id;
rinfo->shadow[id].req.u.rw.id = rinfo->shadow_free;
rinfo->shadow_free = id;
free = info->shadow_free;
info->shadow_free = info->shadow[free].req.id;
info->shadow[id].req.id = info->shadow_free;
info->shadow_free = id;
unsigned int shadow_free;
shadow_free(&objs[i], SV_ID1, shadow_dtor); /* 'char' pairs */