SDL_PollEvent not picking up all events - c++

Question

I'm currently playing around with SDL to make a game and I've run into a problem where SDL is not picking up some events. For exampling, I would be pressing 'w' to move forward and at the same time, I'm moving my mouse to look around. But let's say I then press 'a' or 'd', SDL will not pick these events or even when I release 'w', SDL will not pickup the KEYUP event. I first wrote this code in windows and it all worked fine, but after switching to ubuntu, it doesn't work as expected anymore. Here is my main loop where I poll for events:
while(Running)
{
while(SDL_PollEvent(&event))
Events(&event);
if( active ){
Loop();
Render();
}
}
This is the code within Events():
switch(Event->type)
{
case SDL_QUIT:
Running = false;
break;
case SDL_KEYDOWN:
switch(Event->key.keysym.sym)
{
case SDLK_ESCAPE:
Running = false;
break;
case SDLK_a:
keyStates['a'] = true;
break;
case SDLK_s:
keyStates['s'] = true;
break;
case SDLK_d:
keyStates['d'] = true;
break;
case SDLK_w:
keyStates['w'] = true;
break;
case SDLK_LSHIFT:
camera.setSpeed(2.0f);
break;
}
break;
case SDL_KEYUP:
switch(Event->key.keysym.sym)
{
case SDLK_a:
keyStates['a'] = false;
break;
case SDLK_s:
keyStates['s'] = false;
break;
case SDLK_d:
keyStates['d'] = false;
break;
case SDLK_w:
keyStates['w'] = false;
break;
case SDLK_LSHIFT:
camera.setSpeed(1.0f);
break;
}
break;
case SDL_MOUSEBUTTONDOWN:
switch(Event->button.button)
{
case SDL_BUTTON_MIDDLE:
mouse.middle = true;
break;
}
break;
case SDL_MOUSEBUTTONUP:
switch(Event->button.button)
{
case SDL_BUTTON_MIDDLE:
mouse.middle = false;
break;
}
break;
case SDL_MOUSEMOTION:
if( moving ){
camera.lookat(float(Event->motion.x - winWidth/2),float(Event->motion.y - winHeight/2), MOUSE_SENSITIVITY, dt);
SDL_EventState(SDL_MOUSEMOTION, SDL_IGNORE);
SDL_WarpMouse(winWidth/2, winHeight/2);
SDL_EventState(SDL_MOUSEMOTION, SDL_ENABLE);
}
break;
}

Answer 1

keyStates['a'] = true;
There's SDL_GetKeyState for this. Use it instead of manually maintaining array.
Uint8 keys[SDLK_LAST];
Uint8* sdlKeys = SDL_GetKeyState(0);
memcpy(keys, sdlKeys, sizeof(keys));
.
bool keyPressed(SDLKey key){
return keys[key] == SDL_PRESSED;
}
Also check documentation.