Question

I have some really weird crash here, ive got it before, but i thought i fixed it by adding = NULL to the variable declarations:

#include <stdlib.h>

...

GLuint *TEX = NULL;
int TEX_MEMSIZE = sizeof(GLuint)*1024*1024;

...

void something1(){
    ...
    TEX = (GLuint *)malloc(TEX_MEMSIZE);
    ...
}

void something2(){
    ...
    // this line runs fine.
    if(TEX != NULL){ // CRASH ON THIS LINE OF CODE
        // wont run anything after the above line.
        free(TEX);
    }
    // ...nor here since it crashed...
    ...
}

It crashes on my laptop/vista, but not on my desktop computer/winXP.

When i remove that if check and the free(), it wont crash anymore.

I just dont get it, what im doing wrong? What could cause this? i only know incorrectly predefined arrays can cause some illogical errors, i dont believe there is such incorrect arrays in my code now, so im waiting for more ideas. (and because checking 20k lines of codes can be quite slow too)

Edit: Now i noticed it will not crash before free() but AFTER it. I start thinking its some predefined array problem… since the position of crash is changing. (or i just have dementia).

EDIT 2: FIXED, there was two free() calls, before and after malloc() >_> i feel so stupid now.

Answer 1

How is TEX_MEMSIZE defined?

It should be something like:

#define NUM_ENTRIES 50
#define TEX_MEMSIZE NUM_ENTRIES * sizeof(GLuint)