Hello and really thanks for the answer, I found the solution for the problem also thanks to the gdb debugger. My problem was a SegmentationFault runtime error due to a little tricky:
the function SPGIST_FUNCTION(pquad_equals_op) is defined as follows #define SPGIST_FUNCTION(name) extern "C" Datum name(PG_FUNCTION_ARGS) extern "C" { PG_FUNCTION_INFO_V1(pquad_consistent); PG_FUNCTION_INFO_V1(pquad_nn_consistent); PG_FUNCTION_INFO_V1(pquad_penalty); PG_FUNCTION_INFO_V1(pquad_checkinternalsplit); PG_FUNCTION_INFO_V1(pquad_picksplit); PG_FUNCTION_INFO_V1(pquad_childbp); PG_FUNCTION_INFO_V1(pquad_keylen); PG_FUNCTION_INFO_V1(pquad_check); PG_FUNCTION_INFO_V1(pquad_printpred); PG_FUNCTION_INFO_V1(pquad_getpred); PG_FUNCTION_INFO_V1(pquad_getparam); PG_FUNCTION_INFO_V1(pquad_inside_op); PG_FUNCTION_INFO_V1(pquad_check_chaining); } but as you can see, this "C" lacks the row PG_FUNCTION_INFO_V1(pquad_equals_op); that's why it was not working... I didn't noticed it because as far as I don't access any pointer's argument, I don't get any error back! (I really don't know why, is it maybe because of some default setting?) Anyway thanks again to all! Simone On 12/04/2008, Tom Lane <[EMAIL PROTECTED]> wrote: > > "Simone Campora" <[EMAIL PROTECTED]> writes: > > I first want to implement it and to make it works, like this: > > > SPGIST_FUNCTION(pquad_equals_op) > > { > > elog (NOTICE, "1"); > > > Point *p1 = (Point *)PG_GETARG_POINTER(0); > > Point *p2 = (Point *)PG_GETARG_POINTER(1); > > > elog (NOTICE, "2"); > > > (1) are you sure this function is marked as being V1 calling convention? > Maybe "SPGIST_FUNCTION" takes care of that for you but I don't know. > > (2) since you neither marked it STRICT nor defended against nulls in the > function body, I'd fully expect a crash on a null input ... does that > table contain any null points? > > > > Could anyone suggest me a good runtime debugger for that purpose? > > > Any C debugger should work fine. gdb and ddd are the most common > tools around this project, I think. > > regards, tom lane > -- Campora Simone, ________________________ School of computer science Swiss Federal Institute of Technology, Lausanne EPFL E-MAIL: [EMAIL PROTECTED] [EMAIL PROTECTED] WWW: www.simonecampora.com MOBILE: +41 762 563466 +39 347 8036605 SKYPE: sim0ne.