func (r *VMem) allocGMemAlign(l uint64, a int) *GMem {
gm := &GMem{key: r.key}
gm.off = uint64(C.allocMemAlign(r.head, C.int64(l), C.int(a)))
gm.length = l
return gm
}
func (r *VMem) allocAlign(l uint64, a int) (unsafe.Pointer, error) {
p := C.allocMemAlign(r.head, C.int64(l), C.int(a))
return r.mem.getBuf(uint64(p), l)
}