[mpich-discuss] MPI_Type_struct error

[Ichrak Mehrez]

Hi,

I have a problem with creating a new MPI datatype,
my old_type is a linked list:
 
struct ListeElt
{
  long indice;
  long val;
  struct ListeElt *suiv;
};
typedef struct ListeElt LISTE_Elt:

I try to create a new datatype MPI_Liste:

MPI_Datatype MPI_Liste;
MPI_Datatype type[3] = {MPI_LONG,MPI_LONG,MPI_Liste};

int longueur_bloc[3]={1,1,1};
MPI_Aint disp[3];

LISTE_Elt L;
MPI_Address(&L.indice, disp); 
MPI_Address(&L.val, disp+1); 
MPI_Address(&L.suiv, disp+2); 
 
int base = disp[0]; 
for (j=0; j <3; j++) disp[j] -= base;
MPI_Type_struct(3, longueur_bloc,disp, type,&MPI_Liste);
MPI_Type_commit(&MPI_Liste);

but i got the following error:

Fatal error in PMPI_Type_struct: Invalid datatype, error stack:
PMPI_Type_struct(210): MPI_Type_struct(count=3, blocklens=0x7fff830c6db0, indices=0x7fff830c6d40, old_types=0x7fff830c6da0, new_type_p=0x7fff830c6e40) failed
PMPI_Type_struct(177): Invalid datatype

Thank you for any help.



 		 	   		  
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