Runtime error when calling a callback in a parallel Task

[Ali Çehreli via Digitalmars-d-learn]

On 09/15/2015 04:49 PM, BBasile wrote:
> Under Windows this works fine but under Linux I got a runtime error.

Can it be because 'param' is invalid at the time clbck is called? The 
following program works under Linux. However, removing thread_joinAll() 
is a bug:

import std.parallelism;
import std.stdio;

alias CallBack = void function(void*);

class Foo
{
     CallBack clbck;
     void* param;
     void dotask()
     {
         // some heavy processing
         // tells the caller that some fresh data are available
         if(clbck) clbck(param);  // debugger breaks HERE
     }

     void call()
     {
         task(&dotask).executeInNewThread;
         // returns directly but the caller will get a notif when finished
     }
}

void handler(void* p)
{
     writefln("Finishing with %s at %s", *(cast(int*)p), p);
}

void main()
{
     auto foo = new Foo();
     foo.clbck = &handler;
     int i = 42;
     foo.param = &i;
     foo.call();

     import core.thread;
     thread_joinAll();
}

Ali