mutex problems on Windows

[Dov Grobgeld <dov grobgeld gmail com>]

I'm having a problem with GMutex under Windows that don't lock. The behaviour is definitely different from that under Linux.

The system is composed of to threads. A gui thread G and a worker thread W. The ping pong between the threads via a mutex j->M should work as follows. j is a job data structure that carries info between the worker thread and the gui thread.

1. W locks j->M through g_mutex_lock(j->M) so that a subsequent lock will block.
2. W fills in j with various info to display.
3. W calls g_idle_add(GSourceFunc(cb_update_job), j) to indicate to G that there is info to display.
   
4. W blocks on M through a second call to g_mutex_lock(j->M)
5. G is called in cb_update_job() and updates the gui, also possibly updates j, and then does g_mutex_unlock(j->M)
6. W wakes up and does a g_mutex_unlock(j->M) as it no longer needs the lock on the mutex.
7. W examines the return info that G filled in into j and contiues or aborts its operation.
   

The problem on Win32 is that g_mutex_lock in 4 doesn't block and the thread continues, which eventually will cause the system to crash.

Is something supposed to be different under Windows, or should I file a bug?

Thanks!
Dov