Tim,
Yes, LibUSBDevice::WriteCallback declared as static.
Here is the problem
1) in the following code.
int cnt=0;
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 );
cout << ++cnt << "Bulk Transfer call
libusb_handle_events_timeout,completed value is " << completed <<
std::endl;
}
for some very simple multi-threading , it works, but in more complicate
case, the code stuck in the loop and I am getting the following:
1 Bulk Transfer call libusb_handle_events_timeout,completed value is 0
2 Bulk Transfer call libusb_handle_events_timeout,completed value is 0
3 Bulk Transfer call libusb_handle_events_timeout,completed value is 0
....
400Bulk Transfer call libusb_handle_events_timeout,completed value is 0
...
somehow the callback is never called.
2) If I lock a shared critical_section in the beginning of the transfer
function,(That means I am running single thread, I am serialize the call)
it takes 4-5 calls for libusb_handle_events_timeout to call the callback
and exit the loop. this is the case even when 0 byte is read.
3) If I lock a shared critical_section before the calls to
libusb_handle_events_timeout_completed, the behavior is worst than the
first Scenario,
it stuck even in a very simple case.
Any suggestions?
thx
On Wed, Sep 12, 2012 at 9:49 AM, Tim Roberts <t...@probo.com> wrote:
> John Chen 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?
>
> Is LibUSBDevice::WriteCallback declared as static?
>
> What DO you see? Is there an error, or does it simply never return?
> How many bytes are you trying to read? What is the value of "endpoint"?
>
> --
> Tim Roberts, t...@probo.com
> Providenza & Boekelheide, Inc.
>
>
>
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