On 10/25/20 3:19 AM, rikki cattermole wrote:
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.
Thanks. That's reassuring. :) So, as long as the D function documents
that the C side should make a copy if they want to extend the string's
lifetime it's their responsibility. And from your description I
understand that they have time to make that copy.
Ali
