[fpc-pascal] cthreads

Henry Vermaak henry.vermaak at gmail.com
Sun Jul 27 17:01:39 CEST 2014

On Sun, Jul 27, 2014 at 02:39:58PM +0200, Sven Barth wrote:
> On 27.07.2014 11:39, Mark Morgan Lloyd wrote:
> >Sven Barth wrote:
> >>On 26.07.2014 19:50, leledumbo wrote:
> >>>>Because then all apps are linked to it, also the ones that don't need
> >>>threads. Same for clocale and cwstrings.
> >>>
> >>>If the widestring manager could be made by ourselves, is it possible for
> >>>thread manager as well?
> >>
> >>Principiall yes, but the problem here would be external code that the
> >>program links to. E.g. Wine did something like this some time ago
> >>(before they switched to pthreads) and needed to simulate some
> >>structures so that libc switches to multithreaded mode... So if we
> >>have Pascal only code (like the compiler) this would work without big
> >>problems (if someone implements it of course ;) ), but if you have 3rd
> >>party code not written in FPC then problems might arise...
> >
> >On the other hand, if somebody's linking in "alien" code then he should
> >make himself aware of aware of the prerequisites, particularly since the
> >threads are more likely to be in the main program (i.e. stuff that he's
> >written) than in the library he's pulling in.
> That's not true. E.g. the Qt libraries happily create threads for various
> background stuffs.

Ha, I had a library that started a thread and it took me ages to figure
out why my pascal program was crashing on callbacks from external
threads.  I had to start a dummy thread right at the start of the
program, even though I included cthreads.  Not a good experience all in


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