[fpc-pascal] cthreads

[Fabio Luis Girardi]

The same question that I posted on bugtracker:

Linux, BSD, Unix, has another threaddriver than cthreads? If no, why not
make cthreads unit the default threaddriver for Unix?


2014-07-25 7:33 GMT-03:00 Michael Van Canneyt <michael at freepascal.org>:

>
>
> On Fri, 25 Jul 2014, Mark Morgan Lloyd wrote:
>
>  Michael Van Canneyt wrote:
>>
>>> On Fri, 25 Jul 2014, Juha Manninen wrote:
>>>
>>>  I was asked why a threaded application compiles on Linux without "uses
>>>> cthreads" but it does not work.
>>>> cthreads must _always_ be added to uses section.
>>>> I had no answer to that. IMO such errors should be trapped at
>>>> compile-time, not at run-time.
>>>> Could it be fixed somehow?
>>>>
>>>
>>> No, because there is no way to detect that threads are actually used in
>>> the program.
>>>
>>
>>  I will add a remark in the classes unit TThread class documentation, to
>>> make it even more obvious.
>>>
>>
>> Is there scope for improving the error message?
>>
>> Is there a scenario in which a program that sometimes uses threads (e.g.
>> if it realises it's being asked to do a big job which can be parallelised)
>> could start without giving the error message? This would make the situation
>> more serious, since it would require that the programmer did some /real/
>> testing before shipping his code :-)
>>
>
> Not sure what you mean.
>
> The error only appears if you call a function that relies on the threading
> manager, never at the start of the program. It's slightly more complicated
> than this, but it boils down to that.
>
> So the fact that the program started doesn't mean there won't be an error
> further down the line. But that is IMHO no different from many other
> programming errors, such as trying to save preferences in a file in a
> directory that doesn't exist. You should always test all cases.
>
>
> Michael.
>
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>



-- 
The best regards,

Fabio Luis Girardi
PascalSCADA Project
http://sourceforge.net/projects/pascalscada
http://www.pascalscada.com
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