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walkero
Are SDL threads reliable?
Posted on: 2022/8/28 12:56    #1
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I am working on porting a game which compiles fine when using the SDL threads, but as soon as it tries to start I get a crash on threads, like below:

Stack trace:
    native kernel module kernel+0x00036784
    native kernel module kernel+0x0005c62c
    [autodownload.cpp:80] client:_Z13pingpckserverPv()+0x180 (section 1 @ 0x1F72C)
    ac_client:SDL_RunThread()+0x48 (section 1 @ 0x2E94E8)
    ac_client:OS4_RunThread()+0xa0 (section 1 @ 0x2EA3D4)
    native kernel module dos.library.kmod+0x00029e18
    native kernel module kernel+0x0005f21c
    native kernel module kernel+0x0005f294


In code I see something like below:

#ifdef USE_SDL_THREADS
    #include "SDL_timer.h"
    #include "SDL_thread.h"      // also fetches SDL_mutex.h
#else
    #include <pthread.h>
    #include <semaphore.h>
    #include <sys/shm.h>
#endif


I thought to try to compile without SDL threads, but because I am using newlib there is no semaphore.h there.

What I would like to ask, is SDL threads used or you always try to use something else?
Does anyone have any workaround for semaphore to be used with newlib?

Thank you for your help.
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Capehill
Re: Are SDL threads reliable?
Posted on: 2022/8/28 14:22    #2
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@walkero

SDL threads are used to play audio, at least.

I don't know if there are some limitations regarding networking, for example.
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trgswe
Re: Are SDL threads reliable?
Posted on: 2022/8/28 16:30    #3
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@walkero

psemaphore is available on os4depot
it's supposedly a good semaphore implementation for pthreads
I only read the os4depot description yet, haven't tried it yet.
But i think it's worth a shot if it is Semaphores you have trouble with.
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afxgroup
Re: Are SDL threads reliable?
Posted on: 2022/8/28 16:42    #4
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what is the line of autodownload.cpp:80 ?

It doesn't seems a problem on threads but in the code (maybe because something doesn't work properly)
i'm really tired...
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walkero
Re: Are SDL threads reliable?
Posted on: 2022/8/28 20:43    #5
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@afxgroup
There is some code for accessing an online server to download assets. The crash seems to happen before that line where there is a sdl_LockMutex() is happening. I am trying to figure out what exactly breaks with something like that, which should work fine.
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walkero
Re: Are SDL threads reliable?
Posted on: 2022/8/29 9:40    #6
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It seems that if I disable the server downloading and the audio the game works, but it is pretty slow. Could that be something that is relevant to the threads?

Possibly are code problems I need to figure out and fix, but does this ring a bell to anyone?
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Capehill
Re: Are SDL threads reliable?
Posted on: 2022/8/31 18:06    #7
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@walkero

Maybe you can try Hieronymus. Have you confirmed that there isn't any serial debug slowing down? Is it 3D (MiniGL or OGLES2)?
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