Could someone calrify reserving and collecting memory via the Garbabe Collector ?

[rikki cattermole]

On 07/08/2020 5:12 AM, wjoe wrote:
> There's core.memory.GC.reserve which requests memory from the OS. 
> Basically pre-allocating memory for the GC heap.
> 
> Is the GC heap shared among all threads ?

That is up to the GC implementation.

> And is it correct that even if I call GC.disable, the GC may still start 
> a collection run if, for instance, there's an allocation but no free 
> memory on the GC heap ?

"Disables automatic garbage collections performed to minimize the 
process footprint. Collections may continue to occur in instances where 
the implementation deems necessary for correct program behavior, such as 
during an out of memory condition. This function is reentrant, but 
enable must be called once for each call to disable."

https://dlang.org/phobos/core_memory.html#.GC.disable

So yes.

Note, out of memory is related to the process, rather than GC internals 
(it does play a part, but lets just go with process).