On Saturday, 9 May 2015 at 18:41:59 UTC, bitwise wrote:
What does 'shared' do to member variables?
Makes them `shared`. :P
It makes sense to me to put it on a global variable, but what
sense does it make putting it on a member of a class?
Globals are not the only way to pass data to other threads. E.g.,
you can std.concurrency.send a shared Object:
----
import core.thread: thread_joinAll;
import std.concurrency;
class C {int x;}
void main()
{
auto c = new shared C;
c.x = 1;
auto tid = spawn(() {
receive(
(shared C c) {c.x = 2;}
);
});
send(tid, c);
thread_joinAll();
assert(c.x == 2);
}
----
That shared C could come from a class/struct member, of course.
What happens if you try to access a member of a class/struct
instance from another thread that is not marked 'shared'?
I think you're not supposed to be able to do that.
