Dear monks,

I have to write a XS module that does some simulations with a lot of data (an array of ~10.000.000 structures). The simplified code is:

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include "stdlib.h"

struct s {
    int field1;
    int field2;
    int field3;
};

void do_simulation() {
    int i;
    struct s* m = (struct s*)malloc(10000000 * sizeof(struct s));

    // do some computation with data
    // but for simplifying things I'll do a simple initialization

    for ( i=0; i<10000000; i++ ) {
        m[i].field1 = 0;
        m[i].field2 = 1;
        m[i].field3 = 2;
    }    

    free(m);
}

MODULE = MyModule        PACKAGE = MyModule

void
sim()
  CODE:
    do_simulation();

[download]

Everything builds without problems, but the memory isn't freed after the function call. If I call do_simulation() function from a simple CPP file in a MS VS project, all is O.K. and the memory is freed instantly after function call.

The platform: Win32 XP SP2, ActiveState Perl 5.6.1, MS VS 6.0

What do I wrong?

In reply to Calling a C function using malloc() in a XS by Anonymous Monk

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