[fpc-devel] Threading support and C library under Linux/Unix

[Florian Klaempfl]

Michael Schnell schrieb:
> On 06/24/2010 10:02 AM, Florian Klaempfl wrote:
>> Well, yes, you shouldn't simply use locked operations in a single cpu
>> environment, your application should provide different algorithms for
>> single and multi cpu/threaded environments if the application really
>> contains speed critical code requiring locking. 
> Do you suggest the application programmer should take care about if the
> application runs on a multi.CPU system or a single CPU system ?

Yes. If it's real time or performance critical then he should really
know when locking is needed etc.

>> This is why FPC uses
>> inclocked/declocked for fast reference counting.
>>   
> I don't understand.
> 
> with ARM inclocked() calls InterlocktIncrement, that triggers exactly
> this problem.

... because nobody provided a better implementation yet, e.g. i386 does.
 Nobody provided either code yet which makes dynamic use of strex/ldex
as newer arms provide as I did e.g. for move using pld if available
because I needed it.