[fpc-pascal] Common OpenMP syntax?

Steve Williams stevewilliams at kromestudios.com
Fri Jul 21 01:19:23 CEST 2006

Marc Weustink wrote:
> Steve Williams wrote:
>> I would suggest something along the lines of the C/C++ implementation, 
>> but using the Pascal form of compiler directives.
>> Using some of the documented examples in the v2.5 spec:
>> Example A.1.1:
>> procedure a1(n: Integer; a: PSingleArray; b: PSingleArray);
>> var
>>  i: Integer;
>> begin
>>  {$omp parallel for}
>>  for i := 1 to n - 1 do
>>    b^[i] := (a^[i] + a^[i - 1]) / 2.0;
>> end;
> Brrr.... using local defines look not native to the language.
> Why not something like as (refered in another thread) pascal-fc which 
> uses cobegin..coend or known blocks like asm..end; try..end;
> for instance:
>   omp..end;
>   parralel..end;

One of the pretexts behind OpenMP is that the code will still compile if 
OpenMP is not available or disabled on a particular compiler.  That's 
the reason behind using compiler directives instead of new keywords.  
Using compiler directives similar to the C/C++ directives also means 
that the wealth of information already out there is instantly applicable 
to the Pascal version.


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