I think binaries are refcounted and shared in Erlang? I'm not sure if this happens between schedulers/cores, though. They're also obviously immutable, so might not be what you mean by "sharing memory atomically".
Other than Erlang, Pony[1] might be an interesting choice. It allows sharing memory, even mutable memory, but it tracks the sharing in the type system. It's been a long time since I looked at it, and it definitely had a bunch of rough edges, but I really liked where the things were going. I hope it got even better since.
For me C (1970) and Java (1990) are the only options for eternity.
I use some C++ features and dabble in js when I make HTML but really since Applet and Flash has been removed the browser is just a bloated waste of time.
Make your apps fast by allowing them to share memory without latency!
I have also coded Perl, VisualBasic, php and C# and I'm pretty sure this is it.
What we need now are VMs that can take any bytecode/instructionset and translate it to all others. For true crossplatform development. But that requires us to dump dynamic allocation. Arrays of 64 byte structures FTW!
