malloc triggering breakpoint

Question

I am building an application consisting of the following, separate modules: - GAClient: a C++ executable - GAOrcl: a C DLL generated by Oracle Pro*C - GAEngine: a C++ DLL - MyGAUtils: a C++ library of functions

Here's how the different modules are related: - GAClient calls several functions from GAOrcl, and a few from MyGAUtils; - GAOrcl calls a few functions from GAEngine ("DoGATraining" is one of them) - GAEngine calls several functions from MyGAUtils

I have two similar instructions in GAClient.cpp:

 double* vKaz=(double*)malloc(5*sizeof(double*));

and GAEngine.cpp:

double* vPastTarget=(double*)malloc(5*sizeof(double*)); 

My problem is, malloc works fine when called from GAClient, but subsequently crashes when called from GAEngine. Visual Studio debugger throws a "GAClient.exe has triggered a breakpoint" arror, and points me to a "lseeki64.c" source file, which I have no idea what is...

I suspect this might have something to do with the fact that DoGATraining is defined as an extern "C":

#define EXPORT __declspec(dllexport)
extern "C" EXPORT int       __stdcall DoGATraining(int pPastDataCount, double* pPastData)

Any idea where I might start troubleshooting?

Answer 1

You want an array of 5 doubles, not an array of 5 pointers to double, so change

double* vKaz=(double*)malloc(5*sizeof(double*));

to

double *vKaz = malloc(5 * sizeof(double)); /* don't cast malloc */

or

double *vKaz = malloc(5 * sizeof(*vKaz));