Parallel routines

[abc123]

I am trying to write a simple parallel routine.I wrote a simple C+ application, compiled it, lined it and created the executable. I created the .so file. In the routine, in the Library Path, I put in the path and filename of the .so file. I wrote a simple job to test this routine. My job
compiles fine but when I go to run it I get the following error:

-------------------------------------------------------------------------------
Transformer_1: Failed to load the library "V0S1_RoutineTest_Transformer_1.so"; either the directory containing the library file
is not on the library search path, or the library was compiled on a system
that is incompatible with this system: Could not load "V0S1_RoutineTest_Transformer_1": /opt/Ascential/DataStage/Projects/MyProject/RT_BP574.O/V0S1_RoutineTest_Transformer_1.so: undefined symbol: _Z13rtOnev.
------------------------------------------------------------------------------

Name of my routine is rtOne. Name of my job is RoutineTest.

My C++ code for the routine is:

-------------------------------------------------------------------------
#include <cstdlib>
#include <iostream>
#include <string>

using namespace std;

int main(int argc, char *argv[])
{

cout << "Hello World" << endl;
return EXIT_SUCCESS;
}
---------------------------------------------------------------------------

This code works fine from Unix. I went through all the related posts in this forum. I could not find a complete example. I would appreciate any help.

[DSguru2B]

A few pointers:
-Create the routine as a stand alone function. THat means that it should not have a main function but could be executed if called from a main function.
-Instead of creating the object file and supplying it as a library, supply it as an object file. Choose the option of object file instead of library.

[Yuan_Edward]

It may be an issue with the compiler/linker options. Are you using dynamic or static library?

Anyway the object file optin will always work . I would recommend to use the same compiler options as DataStage (APT_COMPILEOPT) when you compile the C++ codes into the object file.

I am trying to write a simple parallel routine.I wrote a simple C+ application, compiled it, lined it and created the executable. I created the .so file. In the routine, in the Library Path, I put in the path and filename of the .so file. I wrote a simple job to test this routine. My job
compiles fine but when I go to run it I get the following error:

-------------------------------------------------------------------------------
Transformer_1: Failed to load the library "V0S1_RoutineTest_Transformer_1.so"; either the directory containing the library file
is not on the library search path, or the library was compiled on a system
that is incompatible with this system: Could not load "V0S1_RoutineTest_Transformer_1": /opt/Ascential/DataStage/Projects/MyProject/RT_BP574.O/V0S1_RoutineTest_Transformer_1.so: undefined symbol: _Z13rtOnev.
------------------------------------------------------------------------------

Name of my routine is rtOne. Name of my job is RoutineTest.

My C++ code for the routine is:

-------------------------------------------------------------------------
#include <cstdlib>
#include <iostream>
#include <string>

using namespace std;

int main(int argc, char *argv[])
{

cout << "Hello World" << endl;
return EXIT_SUCCESS;
}
---------------------------------------------------------------------------

This code works fine from Unix. I went through all the related posts in this forum. I could not find a complete example. I would appreciate any help.

[mohdsuf]

As far as my knowledge and experience goes, you have to have a FUNCTION with any return type required by your C/C++ program and call that function in your MAIN. You must have to write the MAIN after the declaration of your FUNCTION ie FUNCTION first and MAIN body below it.
Also the name of the routine name and external subroutine name in DSMANAGER should always be same as that of FUNCTION name in C++ program, and compile the code in the project directory.
Try "aCC" compiler for compiling
Try this I think with this simple modification you can run your parallel routine. Let me know that it worked for you or not.
I'm also giving a sample c code which you can try with your system.
--------------------------------------------------------------------------------------
/* The function greatest of the three numbers entered*/

#include <stdio.h>


int greatest(int a,int b,int c)
{
if (a>b)
{
if (a>c)
{
return a;
}
else
return c ;
}
else
if(b>c)
{
return b;
}
else
return c;
}
int main()
{
int a1,b1,c1,great;
a1=0;
b1=0;
c1=0;
great=greatest(a1,b1,c1);
return great;
}

[abc123]

DSGuru2B, how do you create a routine as a standalone function? Are you talking about the routine or the C++ code?
As far as the object file, I tried the following:
I checked Object and I put in the .so file and tried. I checked Object again and put in the .o file and tried. I also checked Library, put in the .so file and tried. All failed.

[abc123]

Yuan_Edward, my compiler option from APT_COMPILEOPT is:
-O -fPIC -Wno-deprecated -c

I created the object file with that. I also tried:

-shared -O -fPIC -Wno-deprecated -c

However, this does not create the shared object file.

[mohdsuf]

dear
The way gave the example to create the routine is the live one and I have given you the simplest one. Just try the code and compile it with aCC -z option to prepare .o file. I'm sure you will not get the problem at all.

[abc123]

mohdsuf, my compiler is g++32. I put your code in a file called one.cpp. I tried:

g++32 -c one.cpp

I also tried:

g++32 -O -fPIC -Wno-deprecated -c one.cpp

I then made the object file shared as:

g++32 -shared -o libone.so one.o

Then, I tried everything in my previous post. I still get the following error:

Transformer_1: Failed to load the library "V0S1_RoutineTest_Transformer_1.so"; either the directory containing the library file
is not on the library search path, or the library was compiled on a system
that is incompatible with this system: Could not load "V0S1_RoutineTest_Transformer_1": /opt/Ascential/DataStage/Projects/MyProject/RT_BP574.O/V0S1_RoutineTest_Transformer_1.so: undefined symbol: _Z13rtOnev.

[mohdsuf]

Are you giving the name of the routine/subroutine same as that of function name in C++ code. The routine/subroutine name in dsmanager must match with the function name in your code. Also check that the object type is set as "Object".

[abc123]

Thanks mohdsuf for trying to help. I called everything greatest like your function. I always had the Object checked. My return type is int. I still get the exact same error.

Just to clarify every setting that I have:
Routine Name: greatest
Category: MyCategory
External subroutine name: greatest
Object Type: Object
Library Path: /fld1/fld2/fld2/greatest.so
Type: External Function

[abc123]

I read on one of the posts here that you have to import the External Function using Datastage Manager. Do I have to do that? Under Datastage Manager, External Functions is disabled.

[abc123]

Ok. I figured it out from one of Ray's posts. We can only have the function. We cannot have main()
anywhere. My routine is returning value. However, my original requirement is that I send in 5
string parameters and get 7 back. So there are 5 input parameters and 7 output parameters.
Can we return multiple parameters back from a function? How would we read multiple parameters
back into multiple columns? May be into one column and parses it?

[DSguru2B]

I am glad you figured it out. Thats exactly what I said in my first post, no main function is allowed.
Anywho, you can have as many input parameters and only a single return variable. But you could concatenate all your 7 variables together and return the entire string which you can then parse out.

[abc123]

Thanks DSGuru2B. I didn't understand it at that time.