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Re: [pygame] This program breaks on my Linux

On 2014-06-28 19:14, bw wrote:

if e.key == K_ESCAPE:
                print(1)
                pygame.display.get_init()
                print(2)
                pygame.display.get_surface()
                print(3)
                screen.unlock()
                print(4)
                pygame.display.set_mode((16, 64))
                print(5)
                pygame.display.flip()
                print(6)
                pygame.quit()
                print(7)
                sys.exit()
                print(8)
In this sequence it's understood 8 will never be reached. When the program exits normally 7 is printed and the program terminates. When the fps gallops away, indicating the problem has occurred, the last thing printed is always 6 and the program hangs. In all cases the pygame functions return, except for pygame.quit(). When trying other exit routines in lieu of pygame.quit() the exiting statement hangs, I presume because pygame's cleanup is called. 

Gumm

On 6/28/2014 05:29, Sam Bull wrote:

On ven, 2014-06-27 at 22:35 -0700, bw wrote:

I attached the small program. I'm curious if anyone can run it and
reproduce the problem. I plan on upgrading Ubuntu soon, when I am ready
to risk it: maybe the problem will go away. I'll post the outcome--but
I've been too busy to risk the upgrade, so don't hold yer breath. =)

No idea what the problem could be. I can't reproduce it, but also not
getting more than 130 FPS on my old laptop. I'm curious as to exactly
when it crashes though, can you add some print statements to find
exactly where it crashes?

         if e.key == K_ESCAPE:
             print("Before")
             pygame.quit()
             print("After Pygame exit")
             quit()
             print("Never reached")
I'd also experiment with a couple of different exit functions, to see if 
that makes any difference. For example, try removing the pygame.quit()
call (Pygame will exit safely with Python anyway, so it's a redundant
call here), and using sys.exit() instead of the builtin.




Hi
Could it be that quitting pygame while processing the event queue (well, the if is in the loop where you process the events) isn't that nice?
Maybe this does not address the actual problem, but might help finding the problem.
I would prefer something like this (using the pygame.quit *after* leaving the while loop): 

running = True
while running:
    ...
    for event in pygame.event.get():
        ....
            if event.key == K_ESCAPE:
                running = False

pygame.quit()
sys.exit()
Also I thought (maybe I'm wrong) that pygame.quit() is registered by pygame in the 'atexit' module (so no needed to call separately if quiting the program, of course you need a pygame.quit() if you only want to quit pygame but keep python running). 

I hope that helps

~DR0ID