Re: [Lazarus] local procedure - MultiThreadProc
Mattias Gaertner schrieb: On Wed, 19 Aug 2009 20:52:41 +0200 Florian Klaempfl flor...@freepascal.org wrote: Mattias Gaertner schrieb: You can create a thread call for local procedures, it needs some hacking though: no type checking is possible, you've to work with pointers and pass the context explicitly. Can you give an example? See http://www.freepascal.org/docs-html/rtl/objects/callpointerlocal.html and e.g. the comment of Jonas: (0014130) Jonas Maebe (manager) 2007-08-13 15:02 at http://bugs.freepascal.org/view.php?id=9432 Cool. It really works, at least under linux 32bit. I wonder on what other platforms this will work. objects.pp of FPC uses the same trick (see http://svn.freepascal.org/cgi-bin/viewvc.cgi/trunk/rtl/inc/objects.pp?revision=7964view=markup around line 790) so it can be considered as officially supported and should work on most platforms. -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
[Lazarus] local procedure - MultiThreadProc
I need to call ProcThreadPool.DoParallel with local procedure as a parameter. Does DoParallel allow local procedures to pass a procedural parameters ? I get err: Error: Incompatible type for arg no. 1: Got address of local procedure(Int64,Pointer,TMultiThreadProcItem);Register, expected procedure variable type of procedure(Int64,Pointer,TMultiThreadProcItem);Register Best regards Tomek -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] local procedure - MultiThreadProc
Zitat von Jan Kowalski bor...@gmail.com: I need to call ProcThreadPool.DoParallel with local procedure as a parameter. Does DoParallel allow local procedures to pass a procedural parameters ? I get err: Error: Incompatible type for arg no. 1: Got address of local procedure(Int64,Pointer,TMultiThreadProcItem);Register, expected procedure variable type of procedure(Int64,Pointer,TMultiThreadProcItem);Register That would be really helpful. But I don't know how to define a local procedure type: type TMTLocalProcedure = procedure(Index: PtrInt; Data: Pointer; Item: Pointer); ? var p: TMTLocalProcedure; procedure TestWithLocalProc; procedure LocalProc(Index: PtrInt; Data: Pointer; Item: TMultiThreadProcItem); begin end; begin p:=...@localproc; end; Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] local procedure - MultiThreadProc
Mattias Gärtner wrote: Zitat von Jan Kowalski bor...@gmail.com: I need to call ProcThreadPool.DoParallel with local procedure as a parameter. Does DoParallel allow local procedures to pass a procedural parameters ? I get err: Error: Incompatible type for arg no. 1: Got address of local procedure(Int64,Pointer,TMultiThreadProcItem);Register, expected procedure variable type of procedure(Int64,Pointer,TMultiThreadProcItem);Register That would be really helpful. But I don't know how to define a local procedure type: I wouldn't be sure it's possible. It makes no sense. My guess: A local (nested) procedure has access to the outer(parent or grand-parent if recursive) procedures variables (stackframe). Therefore a local procedure must expect to be somewhere below this parent. If it was given as a pointer to some other procedure/object, and then called later, this may happen outside the parent. Then no such stackframe does exist, and the local procedure can not work. Martin type TMTLocalProcedure = procedure(Index: PtrInt; Data: Pointer; Item: Pointer); ? var p: TMTLocalProcedure; procedure TestWithLocalProc; procedure LocalProc(Index: PtrInt; Data: Pointer; Item: TMultiThreadProcItem); begin end; begin p:=...@localproc; end; Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] local procedure - MultiThreadProc
Martin schreef: Mattias Gärtner wrote: Zitat von Jan Kowalski bor...@gmail.com: I need to call ProcThreadPool.DoParallel with local procedure as a parameter. Does DoParallel allow local procedures to pass a procedural parameters ? I get err: Error: Incompatible type for arg no. 1: Got address of local procedure(Int64,Pointer,TMultiThreadProcItem);Register, expected procedure variable type of procedure(Int64,Pointer,TMultiThreadProcItem);Register That would be really helpful. But I don't know how to define a local procedure type: I wouldn't be sure it's possible. It makes no sense. My guess: A local (nested) procedure has access to the outer(parent or grand-parent if recursive) procedures variables (stackframe). Therefore a local procedure must expect to be somewhere below this parent. If it was given as a pointer to some other procedure/object, and then called later, this may happen outside the parent. Then no such stackframe does exist, and the local procedure can not work. And therefore such a local procedure type must be a combination of local scope and address: http://wiki.freepascal.org/Mac_Local_Procedure_Parameters This feature is not yet implemented: http://wiki.freepascal.org/Language_related_articles#Ideas_for_new_stuff Vincent -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] local procedure - MultiThreadProc
Zitat von Vincent Snijders vsnijd...@vodafonevast.nl: Martin schreef: Mattias Gärtner wrote: Zitat von Jan Kowalski bor...@gmail.com: I need to call ProcThreadPool.DoParallel with local procedure as a parameter. Does DoParallel allow local procedures to pass a procedural parameters ? I get err: Error: Incompatible type for arg no. 1: Got address of local procedure(Int64,Pointer,TMultiThreadProcItem);Register, expected procedure variable type of procedure(Int64,Pointer,TMultiThreadProcItem);Register That would be really helpful. But I don't know how to define a local procedure type: I wouldn't be sure it's possible. It makes no sense. It makes enough sense in this case. For example when you want to execute a loop in parallel, then you extract the loop into a procedure. With a local procedure you can keep the variables, which would make the process quite easy. If you can not use a local procedure, then you must define a record and move the local variables there. Of course nested local procedures creates a whole bunch of problems, so maybe the record approach is much safer. Maybe the extract procedure tool can be extended to do some of the monotone work automatically. I will explain the process in more detail on the wiki. My guess: A local (nested) procedure has access to the outer(parent or grand-parent if recursive) procedures variables (stackframe). Therefore a local procedure must expect to be somewhere below this parent. If it was given as a pointer to some other procedure/object, and then called later, this may happen outside the parent. Then no such stackframe does exist, and the local procedure can not work. And therefore such a local procedure type must be a combination of local scope and address: http://wiki.freepascal.org/Mac_Local_Procedure_Parameters This feature is not yet implemented: http://wiki.freepascal.org/Language_related_articles#Ideas_for_new_stuff Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] local procedure - MultiThreadProc
Mattias Gärtner wrote: Zitat von Vincent Snijders vsnijd...@vodafonevast.nl: Martin schreef: Mattias Gärtner wrote: Zitat von Jan Kowalski bor...@gmail.com: I need to call ProcThreadPool.DoParallel with local procedure as a parameter. Does DoParallel allow local procedures to pass a procedural parameters ? I get err: Error: Incompatible type for arg no. 1: Got address of local procedure(Int64,Pointer,TMultiThreadProcItem);Register, expected procedure variable type of procedure(Int64,Pointer,TMultiThreadProcItem);Register That would be really helpful. But I don't know how to define a local procedure type: I wouldn't be sure it's possible. It makes no sense. It makes enough sense in this case. Sorry badly worded on my behalf. It makes no sense, should have been: it can not be used the same way like normal procedure references, because it is limited to the scope. the way described on the link by Vincent indeed makes sense For example when you want to execute a loop in parallel, then you extract the loop into a procedure. With a local procedure you can keep the variables, which would make the process quite easy. If you can not use a local procedure, then you must define a record and move the local variables there. Of course nested local procedures creates a whole bunch of problems, so maybe the record approach is much safer. Maybe the extract procedure tool can be extended to do some of the monotone work automatically. I will explain the process in more detail on the wiki. My guess: A local (nested) procedure has access to the outer(parent or grand-parent if recursive) procedures variables (stackframe). Therefore a local procedure must expect to be somewhere below this parent. If it was given as a pointer to some other procedure/object, and then called later, this may happen outside the parent. Then no such stackframe does exist, and the local procedure can not work. And therefore such a local procedure type must be a combination of local scope and address: http://wiki.freepascal.org/Mac_Local_Procedure_Parameters This feature is not yet implemented: http://wiki.freepascal.org/Language_related_articles#Ideas_for_new_stuff Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] local procedure - MultiThreadProc
Mattias Gärtner schrieb: Zitat von Vincent Snijders vsnijd...@vodafonevast.nl: Martin schreef: Mattias Gärtner wrote: Zitat von Jan Kowalski bor...@gmail.com: I need to call ProcThreadPool.DoParallel with local procedure as a parameter. Does DoParallel allow local procedures to pass a procedural parameters ? I get err: Error: Incompatible type for arg no. 1: Got address of local procedure(Int64,Pointer,TMultiThreadProcItem);Register, expected procedure variable type of procedure(Int64,Pointer,TMultiThreadProcItem);Register That would be really helpful. But I don't know how to define a local procedure type: I wouldn't be sure it's possible. It makes no sense. It makes enough sense in this case. For example when you want to execute a loop in parallel, then you extract the loop into a procedure. With a local procedure you can keep the variables, which would make the process quite easy. If you can not use a local procedure, then you must define a record and move the local variables there. Of course nested local procedures creates a whole bunch of problems, so maybe the record approach is much safer. Maybe the extract procedure tool can be extended to do some of the monotone work automatically. I will explain the process in more detail on the wiki. You can create a thread call for local procedures, it needs some hacking though: no type checking is possible, you've to work with pointers and pass the context explicitly. -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] local procedure - MultiThreadProc
On Wed, 19 Aug 2009 17:33:59 +0200 Florian Klaempfl flor...@freepascal.org wrote: Mattias Gärtner schrieb: Zitat von Vincent Snijders vsnijd...@vodafonevast.nl: Martin schreef: Mattias Gärtner wrote: Zitat von Jan Kowalski bor...@gmail.com: I need to call ProcThreadPool.DoParallel with local procedure as a parameter. Does DoParallel allow local procedures to pass a procedural parameters ? I get err: Error: Incompatible type for arg no. 1: Got address of local procedure(Int64,Pointer,TMultiThreadProcItem);Register, expected procedure variable type of procedure(Int64,Pointer,TMultiThreadProcItem);Register That would be really helpful. But I don't know how to define a local procedure type: I wouldn't be sure it's possible. It makes no sense. It makes enough sense in this case. For example when you want to execute a loop in parallel, then you extract the loop into a procedure. With a local procedure you can keep the variables, which would make the process quite easy. If you can not use a local procedure, then you must define a record and move the local variables there. Of course nested local procedures creates a whole bunch of problems, so maybe the record approach is much safer. Maybe the extract procedure tool can be extended to do some of the monotone work automatically. I will explain the process in more detail on the wiki. You can create a thread call for local procedures, it needs some hacking though: no type checking is possible, you've to work with pointers and pass the context explicitly. Can you give an example? Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] local procedure - MultiThreadProc
Mattias Gaertner schrieb: You can create a thread call for local procedures, it needs some hacking though: no type checking is possible, you've to work with pointers and pass the context explicitly. Can you give an example? See http://www.freepascal.org/docs-html/rtl/objects/callpointerlocal.html and e.g. the comment of Jonas: (0014130) Jonas Maebe (manager) 2007-08-13 15:02 at http://bugs.freepascal.org/view.php?id=9432 -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
