> Rather make this per open than per device. As is, it will really hurt > performance with multiple capturing opens (or doesn't v4l1 allow > this?). Can't the driver implement it's own semaphore if it needs it? Multiple opens are impossible under v4l. However multithreaded tasks could do concurrent reads or writes. This is not intended I think, thus the semaphores. It's hard to see how the hardware could do several reads at the same time. Thus v4l can do this for the drivers. This is a race that hits 2/3 of the usb video devices. Regards Oliver
