Program crash: GC destroys an object unexpectedly

[Ali Çehreli]

On 9/14/21 9:56 AM, eugene wrote:

 > On Tuesday, 14 September 2021 at 16:43:50 UTC, jfondren wrote:

 >> The misaligned pointer and the
 >> reference-containing struct that vanishes on the return of your
 >> corresponding function are both problems for this.
 >
 > where did you find 'misaligned pointer'?...

I think it's the align(1) for EpollEvent.

I was able to reproduce the segmentation fault and was seemingly able to 
fix it by making the EventSource class references alive by adding a 
constructor:

align (1) struct EpollEvent {
     align(1):
     uint event_mask;
     EventSource es;

   this(uint event_mask, EventSource es) {
     this.event_mask = event_mask;
     this.es = es;
     living ~= es;  // <-- Introduced this constructor for this line
   }
     /* just do not want to use that union, epoll_data_t */
}

// Here is the array that keeps EventSource alive:
EventSource[] living;

If that really is the fix, of course the references must be taken out of 
that container when possible.

Ali