[PD] external glitch with jack not with alsa why?

[patrick]

hi,

update on this problem:

instead of trying to rewrite the external, i was trying to use netsend 
(udp) / netreceive to send 17 messages (int) each 10 ms using 2 
instances of pd (-nrt -nogui / pd -rt -jack). i have a strange behaviour 
with pd -rt -jack, i cannot click anywhere, it's frozen until i disable 
compute audio and then all my previous action (opening sub-patch) are 
working, but if i check compute audio again same problem? same goes for 
mrpeach external (osc).

so it seems that flooding netsend / netreceive is not a good idea to 
avoid glitch. i have to find a way to make my external work with pd -rt 
-jack. this is the line that causing the glitch:

nBytes = usb_control_msg(x->dev_handle, USB_TYPE_VENDOR | 
USB_RECIP_DEVICE | USB_ENDPOINT_IN, EDUBEAT_CMD_POLL, 0, 0, (char 
*)buffer, sizeof(buffer), 10);

is using pthread with a buffer would fix this problem?
patrick