On Tuesday, 23 September 2014 at 18:39:09 UTC, Oscar Martin wrote:
On Tuesday, 23 September 2014 at 01:58:50 UTC, Rikki Cattermole
wrote:
Short, I dislike pretty much all changes to __gshared/shared.
Breaks too many things.
Atleast with Cmsed, (I'm evil here) where I use __gshared
essentially as a read only variable but modifiable when
starting up (to modify need synchronized, to read doesn't).
Yeah, these changes break many things, and so are not suitable
for D2. My intention was only to point out how expensive is for
the GC to deal with shared memory.
Come to think a little more: what if each thread can have its
own GC, but by default all use the current GC (this would
require minimal changes to druntime). "__gshared", "shared" and
"immutable", continue as now, which does not break anything. If
I as a programmer take care of managing (either manually or
through reference counting) all of the shared memory
("__gshared", "shared" or "immutable") that can be referenced
from multiple threads, I could replace in my program the global
GC by a indiviual thread GC
I'll try to implement a GC optimized for a thread and try that
solution
There can also be a shared _and_ a local GC at the same time, and
a thread could opt from the shared GC (or choose not to opt in by
not allocating from the shared heap).
