On May 4, 2007, at 5:50 AM, Anmol Ranka wrote:
1) Is asynchronous non blocking I/0 operation supported by
libhid-0.2.16. If
yes, can you please provide me its documentation?
No. It uses libusb 0.1.x to communicate with the USB device, and
asynchronous I/O is only supported in the development version of
libusb (which has an incompatible API).
2)Can I simultaneously perform read and write operation at a time?
Let me
elaborate. I will create a thread which will perform blocking
'hid_get_input_report'(libhid's equivalent read API) operation. In his
scenario, will 'hid_set_output_report' (libhid's equivalent write API)
request from another thread go through?
In terms of the actual packets on the wire, you can't do this. With
asynchronous I/O, you could queue up a read and a write request back-
to-back, but I would recommend against using libhid from multiple
threads until you have proven that it works in a single thread, and
that both your host and device are OK with multiple threads accessing
the same USB device.
--
Charles Lepple
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