[SDL] SDL_Init issue

[Kostas Kostiadis]

Can't really help if you've somehow clobbered the stack...You'll have to
play around with the debugger and figure it out yourself.
However, there IS help in determining whether you've called SDL_Init() more
than once from different threads.
Have a look at SDL_WasInit.
 
http://docs.mandragor.org/files/Common_libs_documentation/SDL/SDL_Documentat
ion_project_en/sdlwasinit.html
<http://docs.mandragor.org/files/Common_libs_documentation/SDL/SDL_Documenta
tion_project_en/sdlwasinit.html> 
 
It allows you to see which SDL subsystems have been initialised.
 
Good luck.
 
Cheers,
Kos
 


  _____  

From: sdl-bounces at lists.libsdl.org [mailto:sdl-bounces at lists.libsdl.org] On
Behalf Of chris.2.dobbs at bt.com
Sent: 02 May 2007 18:13
To: sdl at lists.libsdl.org
Subject: [SDL] SDL_Init issue



All, 
I have some code which uses SDL for both audio/timers and threads. The
program spawns several worker threads (using SDL threads) and the main line
code calls the SDL_Init() function once only.

When I run the program normally everything is fine BUT when I run it thru a
debugger (like gdb or NJAMD) I get a segment fault after the call the
SDL_Init().

gdb simply dies stone dead at this point with an invalid traceback address
which is useless so I ran NJAMD wrapper and it shits itself at the same
point however I get a little more info:

NJAMD/free: Address 0x0 not from malloc 
        called from ./transcoder_client[0x8058baf] 
        called from ./transcoder_client[0x804c4e6] 

The first address above translates to the source code point where I call
SDL_Init(SDL_INIT_AUDIO|SDL_INIT_TIMER) 

It is very likely that I have clobbered the stack earlier on as this is new
code and untested , or the debugger is getting confused with the multiple
threads ; I just wanted to check, before I dive in and hunt for code
problems, if there are an caveats concerning SDL_Init() and multi-threaded
models? 

Are there any problems in calling SDL_init() more than once from different
threads in the same process context as I 'may' have this going on too....
:-)

Regards, 
-Chris 

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