How to share an appender!string?

[Era Scarecrow via Digitalmars-d-learn]

On Friday, 20 May 2016 at 02:04:56 UTC, captaindet wrote:
> i am most curious about your solution.
>
> why does printAll() has a synchronized block? in case you would 
> call it before thread_joinAll() i.e. before all threads are 
> terminated?

> then again, why is there a synchronized block necessary in 
> printAll() at all? it is only reading out data, not writing.

  If a local copy/slice/range is made for foreach (which I think 
it is) then synchronized isn't needed. If reallocation worked 
differently then it could be quite annoying when the memory is 
reallocated and you were using it; But since it isn't, I just 
threw it in for completion sake.

> (i am still learning the subtleties of multithreading.)

  I tried to learn using C/C++ mutexes and semaphores and got 
hopelessly lost; Never tried to really get into it. Found a whole 
new meaning to the process while just recently re-reading the D2 
book.

  Regardless, let's learn this stuff together :)

  Still if you have any more complex commands then what you're 
doing here, you might wrap it into a class; It appears 
synchronized can work on classes (even Object) and not require a 
separate mutex for it to compile, so... I'm not sure what that 
means, or if it's even safe.