When should objects be freed?

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Consider this code

MPI_Type_vector( ly, 1, nx, MPI_DOUBLE, &newx1 ); 
MPI_Type_hvector( lz, 1, nx*ny*sizeof(double), newx1,  
                  &newx ); 
MPI_Type_commit( &newx );

(This creates a datatype for one face of a 3-D decomposition.) When should newx1 be freed?

Up: MPI Objects Next: Reference counting Previous: The MPI Objects