How can I know that all child thread are gone out?

[Sean Kelly]

On Oct 9, 2012, at 8:44 AM, Druzhinin Alexandr <news at digitalmars.com> wrote:

> Hello
> I spawn several threads and now I need to know if they has finished their job. Before I do it by means of messages from child threads to the main one to inform about finishing. But I'm sure this isn't good enough, because a child thread may fail before sending the exit message to the main thread and the application will hang up. So I'd like to check from the main thread if child threads are gone away. How can I do it?

ThreadGroup.joinAll or spawnLinked if using std.concurrency.