In a normal while loop for processing events a specific structure gets trashed. Can anyone explain why this could be happening: -------------------------- #include <SDL/SDL.h> #include <GL/gl.h> #include <GL/glu.h> #include <stdlib.h> #include <stdio.h> struct particle { float x, vx; float y, vy; }; int main() { SDL_Event event; int done=0; struct particle falling_obj[2]; falling_obj[0].x=falling_obj[0].vx=0.0f; falling_obj[0].y=10.0f; falling_obj[0].vy=-98.0f; falling_obj[1].x=falling_obj[1].vx=0.0f; falling_obj[1].y=10.0f; falling_obj[1].vy=-98.0f; SDL_Init(SDL_INIT_VIDEO); SDL_SetVideoMode(800,600,24,SW_SURFACE | SW_FULLSCREEN | SW_OPENGL); setup_opengl(); // Just the usual stuff... while(!done) { fprintf(stderr, "y:%f vy:%f\n", falling_obj[1].y, falling_obj[1].vy); while(SDL_PollEvents(&event)) { if(event.type==SDL_KEYDOWN) { switch(event.key.keysym.sym) { case SDL_ESCAPE: fprintf(stderr, "ESC!\n\n"); done=1; break; } } } fprintf(stderr, "y:%f vy:%f\n", falling_obj[1].y, falling_obj[1].vy); integrate(falling_obj); } SDL_Quit(); } --------------------------- Prints: y:10.000000 vy:-98.000000 y:0.000000 vy:0.000000 y:0.000000 vy:0.000000 y:0.000000 vy:0.000000 ... y:0.000000 vy:0.000000 ESC! --------------------------- Looks like in the while loop of the function SDL_PollEvent the variable gets trashed, i can say so because i comment that and the program acts normally (But obviously i can't interact nor exit the program). The integrate function takes the pointer to the structure's array and iterate over them taking a delta in time adding constant velocity. But the vars get lost before that happens. And actually if i print the first structure (falling_obj[0]) everything is ok. The problem seems to be only with the second structure. My system is FreeBSD 7 running on a Intel Xeon 2.2 Dual CPU and the SDL program running over Xorg. Any help is appreciated. [Edited by - rcarvajal on October 22, 2008 3:06:46 PM]