On Tue, Sep 11, 2012 at 8:45 PM, John Chen <john...@gmail.com> wrote:
> Hi,
> My app needs be able to read & write (to different enpoint) at same time,
> and my code is not working. but if I change the call to Synchronous
> , everything works fine, could any one tell me what I did wrong here?
> thx
>
> CallBackData* userdata=new CallBackData();
> userdata->ExitTransfer=false;
> int err =0;
> libusb_transfer* transfer =libusb_alloc_transfer(0);
> if (!transfer)
> {
> err=-ENOMEM;
> return NULL;
> }
> libusb_fill_bulk_transfer
> (transfer,m_handle,endpoint,reinterpret_cast<unsigned char*>
> (pbBuffer),
> c_uiLength,LibUSBDevice::WriteCallback,userdata,ITP_TRANSFER_TIMEOUT);
>
> if (!err)
> {
> err = libusb_claim_interface(this->m_handle, 0);
> err=libusb_submit_transfer(transfer);
> while (!userdata->ExitTransfer)
> {
> //I also added Lock here for the whole block here and
> to serialize the call to
> //libusb_handle_events_timeout_completed, but it still does not work.
> struct timeval tv = { 1, 0 };
> int completed =0;
>
> err = libusb_handle_events_timeout_completed(NULL, &tv,&completed );
> }
> }
>
>
What exactly is the problem with the code?
Could it be that userdata is getting destroyed in the callback, so the
!userdata->ExitTransfer check causes your program to crash? What does your
callback look like?
David
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