[PATCH 3/5] amstream: Add a second critical section for filter methods that are called from streams.

[Zebediah Figura (she/her)]

On 4/6/21 1:04 PM, Anton Baskanov wrote:
> Signed-off-by: Anton Baskanov <baskanov at gmail.com>
> ---
> This is required to avoid deadlocks, e.g. when the filter is stopped
> while EndOfStream is being called.

So, if I understand correctly, the race is:


Main thread			Streaming thread
------------------------------------------------
IMediaControl::Stop()		IPin::EndOfStream()
lock graph->cs			IMediaStreamFilter::EndOfStream()
stop parser filter
wait for streaming thread	try to grab graph->cs


Shouldn't patch 0005 be enough to avoid this? We don't hold filter->cs, 
or any amstream-specific locks, while waiting for streaming threads to stop.