On Wed, Mar 20, 2019 at 10:56 PM Cholerae Hu <cholerae...@gmail.com> wrote:
>
> package main
>
> // void a(long *p) {}
> import "C"
>
> import (
> "unsafe"
> )
>
> //go:noinline
> func b() {
> x := int64(0)
> C.a((*C.long)(unsafe.Pointer(&x)))
> // do something without x
> }
>
> func main() {
> b()
> }
>
> x should be considered unreachable after C.a . If x is something allocated on
> heap, do I need to use runtime.KeepAlive(x) to make sure x will not be
> garbage collected?
It's not necessary to use runtime.KeepAlive to keep pointers passed to
cgo functions alive. They will be live for at least the duration of
the cgo call.
Ian
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