Re: Glib mutex doesn't work on Windows

[Kevin DeKorte <kdekorte gmail com>]

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On 12/16/2010 11:47 AM, Michael T. wrote:
> Hi,
>  I'm using glib mutexes on Windows and I think they don't work.
> I tried to use WIN API mutexes instead and they did work.
>
> Short sample program:
> I initialize the WIN API mutex, then create two threads using WIN API with this simple code:
>
> DWORD WINAPI MyThreadFunction( LPVOID lpParam )
> {
>     int i = 0;
>     for(i=0; i<30; i++)
>     {
>         WaitForSingleObject( Mut, INFINITE);
>
>         printf("Jozko jolko %d, thread %d\n", i, GetCurrentThreadId()) ;
>
>         ReleaseMutex(Mut);
>     }
>     return 0;
> }
>
> Without the mutexes the output is messy, because the console is a critical section, and unsynchronized 
> threads create mess. With mutexes applied the output is nice and clean.
> When I try the Glib mutex with the same code, it doesn't work and output remains messy.
>
> The mutex initialization looks like this:
>
> GStaticMutex dataMutex = G_STATIC_MUTEX_INIT;
>
> The function:
>
> DWORD WINAPI MyThreadFunction( LPVOID lpParam )
> {
>   int i = 0;
>
>     for(i=0; i<30; i++)
>     {
>
>         g_static_mutex_lock(&dataMutex);
>
>         printf("Jozko jolko %d, thread %d\n", i, GetCurrentThreadId()) ;
>
>         g_static_mutex_unlock(&dataMutex);
>
>     }
>     return 0;
> }
>
> I used the GStaticMutex according the example code here:
> http://library.gnome.org/devel/glib/2.17/glib-Threads.html#g-static-mutex-lock
>
> There's no problem with compiling, I also don't get any error during execution. I am using MinGW compiler 
> to create the binaries.
> Why does it not work?
>
> Thanks
>
> myso

Myso,

I had this problem developing a GTK application on OpenBSD, it seems
that GMutex's are not guaranteed to be recursive or non-recursive.

I altered my code to work with GConditionals and worked fine. Perhaps,
that will work for you as well.

http://kdekorte.blogspot.com/2009/01/gnome-mplayer-094-will-work-with-bsds.html

Kevin




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