Glib mutex doesn't work on Windows

[Michael T. <myso77 seznam cz>]

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