[SDL] [SDL2] SDL_Init freezing with SDL_INIT_TIMER

Sam Lantinga slouken at libsdl.org
Thu Mar 7 19:14:53 PST 2013


I haven't applied the patch because I want to figure out what's wrong with
the threading emulation code, but I haven't had time to look at it.

Does anyone else want to take a look at it?

On Wed, Mar 6, 2013 at 4:27 PM, Scott Percival <moralrecordings at gmail.com>wrote:

> This is caused by a bug in the CMake script which leads to the
> non-detection of pthreads semaphore support. The patch hasn't been
> applied to hg yet, so grab it from
> http://bugzilla.libsdl.org/show_bug.cgi?id=1709 and you should be
> fine.
>
> On 7 March 2013 03:48, Sik the hedgehog <sik.the.hedgehog at gmail.com>
> wrote:
> > o_o
> >
> > I suppose it must be some recent change because I'm on Ubuntu 12.04
> > LTS x64 too and I don't have any issues. I'm using the latest snapshot
> > from February 28th, if that matters, so if it's a new bug it must be
> > from after that.
> >
> > Which reminds me, if I recall correctly on Ubuntu SDL will default to
> > using gettimeofday instead of clock_gettime, probably because the
> > latter requires linking with librt (-lrt). I have absolutely no idea
> > why configure doesn't even consider it. May not be related to this,
> > but I always found it curious (using gettimeofday can result in lots
> > of issues because you aren't guaranteed it won't be affected by
> > external factors).
> >
> > 2013/3/6, Erick Sousa <puyolzits at gmail.com>:
> >> Greetings SDL community!
> >>
> >> I started porting my game engine from SDL to SDL2 yesterday and I ran
> into
> >> a strange issue.
> >> When calling SDL_Init with SDL_INIT_TIMER flag, the function never
> returns.
> >> It just stays there in some kind of infinite loop.
> >> The same behavior happens when i'm trying to initialize SDL2_mixer,
> >> although SDL2_image and SDL2_ttf are correctly
> >> initialized and work ok.
> >>
> >> My code basically calls SDL_Init with SDL_INIT_TIMER, SDL_INIT_VIDEO and
> >> SDL_INIT_AUDIO flags. And then it initializes
> >> SDL2_ttf, SDL2_image and SDL2_mixer. When calling SDL_Init without
> >> SDL_INIT_TIMER and with SDL2_mixer commented,
> >> there's no freezing.
> >>
> >> I'm using Ubuntu 12.04 LTS on a x64 machine. I've compiled SDL2 directly
> >> from hg as well as SDL2_image, SDL2_ttf and
> >> SDL2_mixer.
> >>
> >> I don't know if it's ok to just paste the trace, but here it is:
> >>
> >> #0  __lll_lock_wait () at
> >> ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:132
> >> #1  0x00007ffff70c7065 in _L_lock_858 () from
> >> /lib/x86_64-linux-gnu/libpthread.so.0
> >> #2  0x00007ffff70c6eba in __pthread_mutex_lock (mutex=0x6054b0) at
> >> pthread_mutex_lock.c:61
> >> #3  0x00007ffff6e88c4c in SDL_mutexP (mutex=0x6054b0) at
> >> /home/puyol/prog/SDL2/src/thread/pthread/SDL_sysmutex.c:103
> >> #4  0x00007ffff6e89011 in SDL_DestroySemaphore (sem=0x605490) at
> >> /home/puyol/prog/SDL2/src/thread/generic/SDL_syssem.c:126
> >> #5  0x00007ffff6e2b5dd in SDL_CreateThread (fn=<optimized out>,
> >> name=<optimized out>, data=<optimized out>)
> >>     at /home/puyol/prog/SDL2/src/thread/SDL_thread.c:286
> >> #6  0x00007ffff6e2bb30 in SDL_TimerInit () at
> >> /home/puyol/prog/SDL2/src/timer/SDL_timer.c:230
> >> #7  0x00007ffff6ddfc75 in SDL_InitSubSystem (flags=49) at
> >> /home/puyol/prog/SDL2/src/SDL.c:106
> >> #8  0x00007ffff6ddfd3a in SDL_Init (flags=49) at
> >> /home/puyol/prog/SDL2/src/SDL.c:216
> >> #9  0x00007ffff7bc7899 in Polymorphic::Engine::Initialize () at
> >> src/engine.cpp:78
> >> #10 0x00007ffff7bc8093 in Polymorphic::Engine::Run (gi=0x7fffffffe100)
> at
> >> src/engine.cpp:134
> >> #11 0x00000000004014d7 in main (argc=1, argv=0x7fffffffe218) at
> >> src/main.cpp:10
> >>
> >> If there's any information I forgot to provide, just tell me. Any help
> will
> >> be appreciated.
> >>
> >> Thanks for you time,
> >>
> >> Erick
> >>
> > _______________________________________________
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