Re: [PATCH v2 0/1] MR1278: winegstreamer: Do not destroy condition variables when a thread is waiting on them.

[Giovanni Mascellani (＠giomasce)]

> Actually, that implies a deeper synchronization problem in mfplat. If we can't clean up the condition variable, then we can't free the filter either.

Mmh, I think you're right. For example, it might be that `Shutdown()` is called when after a `RequestSample()`, but before the `SOURCE_ASYNC_REQUEST_SAMPLE` is being serviced. Thus `Shutdown()` would happily clean up everything, and then `wait_on_sample()` will try to use an object that has been destructed. So the solution must also do something at the media source level, which incidentally looks a bit under-synchronized (for example, `struct media_source::state` is concurrently accessed in many places without any mutex). I'll try to fix the MR.