[libusb] MacOS multiple time interface claim

[michel <dia...@ya...>]

I am porting a library from windows/libusbk to macos (Darwin Kernel Version
10.8.0:)
on Window i want and i can open the same device and interface multiple time
on different process
concurrent access are  of course well managed by lock over all process.

on Mac it seam impossible  to do the same i get the following warning at
open 

libusb: warning [darwin_open] USBDeviceOpen: another process has device
opened for exclusive access

and when trying to claim interface on 2nd process it fail

libusb: error [darwin_claim_interface] USBInterfaceOpen: another process has
device opened for exclusive access

Is it a limitation of the MacOS backend or some willingness not to let user
open multiple time same interface or some issue?

I could found the same issue reported in a very  old thread
http://www.libusb.org/ticket/78 but classified invalid.

Is there any solution or work around  ?




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