Hi libusb-devel,
I'm sending isochronous transfers from host to device with libusb on Linux. I want to keep the host buffer full so that an isochronous packet is transmitted in every frame, but I don't want to submit transfers too fast which would overflow the host buffer. I plan to do this by waiting on the endpoint file descriptor for the POLLOUT event before submitting each tranfer. Is this the best way?
When I poll the endpoint file descriptor after submitting a transfer, I can get a POLLOUT event. But when I poll the endpoint descriptor before submitting a transfer, the POLLOUT event never occurs - it stays blocked from writing forever. I am handling events inside the polling loop in both cases. How can I poll the endpoint descriptor for the POLLOUT event before submitting each transfer?
Thank you,
LibUsb User
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