dont understand this

[rikki cattermole via Digitalmars-d]

On 25/09/2016 10:24 AM, collerblade wrote:
> fellow D programmers
>
> I would like to ask a question! I would like to create a class, which
> works in a separated thread, while the class exisit. This is important.
> I want to kill/terminate/stop the third whenn the class get cleared.
> Thas what i got so far. This is what i got so far (very easy solution):
>
> class MyClass {
>     public:
>         this() {
>             Thread thread=new Thread(&threadFunc);
>             running=true;
>             thread.start();
>         }
>
>         ~this() {
>             writeln(someVariable);
>             running=false;
>         }
>
>     private:
>         bool running=false;
>         int someVariable=1;
>
>         void threadFunc() {
>             while(running) {
>                 someVariable++;
>             }
>         }
> }
>
> Becouse core.thread.Thread doesnt have any stop,pause,therminate method
> i have to stop the thread by myself (with the help of the running
> variable). The problem is: this ISNT WORKING. The reason is: the
> destructor never gets called, so the thread runs forever (application
> didnt exit). So the GC finds somewhere a pointer to the class's instance
> memory (which is ok i think, becouse i use delegate to create the thread).
> But imagagine this: when i change the running variable to static,
> everything works as expected, and the app frees and closes normally. Why
> is the running variable is different from the other someVariable??
> Before u ask:
> - "shared bool running" doesnt works, only static.
> - Tried to keep a reference of the Thread as a local variable, result is
> the same
> - i tried 1000 times the code on 2 different PC, result is the same (no
> random pointer somewhere)
> - i use latest LDC
>
> Obviously, i want to avoid a static running variable, my class can have
> multiple instances.
>
> Ty Collerblade

threadFunc contains a reference to MyClass in the form of the 'this' 
pointer and so the GC sees this and never deallocates the MyClass 
instance to begin with.