toStringz lifetime

[rikki cattermole]

On 25/10/2020 11:03 PM, Ali Çehreli wrote:
> Does the GC see that local variable 'name' that is on the C side? What I 
> don't know is whether the GC is aware only of the stack frames of D 
> functions or the entire thread, which would include the C caller's 'name'.

The thread stack frame that is registered with the D GC will know about 
the D side and may know about the C side.

It depends on what the C side is doing.

If the C side went ahead and made a new stack frame via a fiber... it 
won't know about it. But even if it did, the D stack frame is still 
alive and pinning that bit of memory.

Ultimately, if the C side puts that pointer some place like a global or 
send it to another thread, there are no guarantees that things will play 
out well.