[SDL] [SDL2] SDL_Init freezing with SDL_INIT_TIMER

Scott Percival moralrecordings at gmail.com
Wed Mar 6 16:27:04 PST 2013

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

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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