Re: How to return data from a thread?

[Bob Caryl <bob fis-cal com>]

Kevin Brooks wrote:

> --- Bo Lorentsen <bl lue dk> wrote:
>
>  
>
> > Kevin Brooks wrote:
> >
> >    
> >
> > > I want to know how to return data from a thread.
> > >
> > >
> > >      
> > This has little to do with Gtkmm, but the hint could
> > be to use a pipe or 
> > a semaphore to indicate thread termination, and
> > store the returned data 
> > on the haep, as the heap memory are shared between
> > threads.
> >
> > Hope this helps :-)
> >
> > /BL
> >
> >    
> Hi Bo,
>
> Thank you for your reply and suggestion.
>
> According to the documentation about Glib::Thread
> class(http://www.gtkmm.org/docs/glibmm-2.4/docs/reference/html/classGlib_1_1Thread.html),
> there is a statement saying that "if you want to
> return any data from your thread you can pass an
> additional output argument to the thread's entry
> slot".
>
> I don't quite understand what it means. Is anyone out
> there know how to do it?
>
> Thanks
>
> Kevin
>
>
>
>
>
>
> 		
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>  
Say you wish to output some character data.  You would pass the address 
of a character pointer to your thread as a formal parameter to your 
thread entry slot.   Then somewhere during your thread's execution 
dynamically allocate some memory using the address of that character 
pointer and then memcpy or strcpy the character to that memory before 
terminating the thread.  Make sure that you de-allocate the memory after 
utilizing the returned data.

Bob