int ReapTransfer(transfer_wrapper* wrapper, int timeout)
{
void* context (wrapper->usb);
libusb_transfer* transfer (&wrapper->libusb);
if (transfer->flags & LIBUSB_TRANSFER_FREE_TRANSFER)
{
libusb_free_transfer(transfer);
return(0);
}
const int read = usb_reap_async_nocancel(context, timeout);
bool processed (true);
if (read > 0)
{
PreprocessTransfer(transfer, read);
}
else if (0 == read)
{
const int pkts (transfer->num_iso_packets);
for (int i=0; i<pkts; ++i)
{
libusb_iso_packet_descriptor& desc (transfer->iso_packet_desc[i]);
desc.actual_length = 0;
}
}
else if (read < 0)
{
enum { ETIMEOUT = -116 };
if (ETIMEOUT == read)
{
if (LIBUSB_TRANSFER_CANCELLED != transfer->status)
processed = false;
}
else
{
libusb_cancel_transfer(transfer);
processed = false;
}
}
if (processed)
{
TListTransfers::Remove(wrapper);
transfer->callback(transfer);
if (read > 0)
memset(transfer->buffer, 0, transfer->length);
}
return(read);
}
int TransferAsync(struct BENCHMARK_TRANSFER_PARAM* transferParam, struct BENCHMARK_TRANSFER_HANDLE** handleRef)
{
int ret;
struct BENCHMARK_TRANSFER_HANDLE* handle;
*handleRef = NULL;
// Submit transfers until the maximum number of outstanding transfer(s) is reached.
while (transferParam->OutstandingTransferCount < transferParam->Test->BufferCount)
{
// Get the next available benchmark transfer handle.
*handleRef = handle = &transferParam->TransferHandles[transferParam->TransferHandleNextIndex];
// If a libusb-win32 transfer context hasn't been setup for this benchmark transfer
// handle, do it now.
//
if (!handle->Context)
{
// Data buffer(s) are located at the end of the transfer param.
handle->Data = transferParam->Buffer + (transferParam->TransferHandleNextIndex * transferParam->Test->BufferSize);
handle->DataMaxLength = transferParam->Test->BufferSize;
switch (ENDPOINT_TYPE(transferParam))
{
case USB_ENDPOINT_TYPE_ISOCHRONOUS:
ret = usb_isochronous_setup_async(transferParam->Test->DeviceHandle,
&handle->Context,
transferParam->Ep.bEndpointAddress,
transferParam->IsoPacketSize ? transferParam->IsoPacketSize : transferParam->Ep.wMaxPacketSize);
break;
case USB_ENDPOINT_TYPE_BULK:
ret = usb_bulk_setup_async(transferParam->Test->DeviceHandle,
&handle->Context,
transferParam->Ep.bEndpointAddress);
break;
case USB_ENDPOINT_TYPE_INTERRUPT:
ret = usb_interrupt_setup_async(transferParam->Test->DeviceHandle,
&handle->Context,
transferParam->Ep.bEndpointAddress);
break;
default:
ret = -1;
break;
}
if (ret < 0)
{
CONERR("failed creating transfer context ret=%d\n",ret);
goto Done;
}
}
// Submit this transfer now.
handle->ReturnCode = ret = usb_submit_async(handle->Context, handle->Data, handle->DataMaxLength);
if (ret < 0) goto Done;
// Mark this handle has InUse.
handle->InUse = TRUE;
// When transfers ir successfully submitted, OutstandingTransferCount goes up; when
// they are completed it goes down.
//
transferParam->OutstandingTransferCount++;
// Move TransferHandleNextIndex to the next available transfer.
INC_ROLL(transferParam->TransferHandleNextIndex, transferParam->Test->BufferCount);
}
// If the number of outstanding transfers has reached the limit, wait for the
// oldest outstanding transfer to complete.
//
if (transferParam->OutstandingTransferCount == transferParam->Test->BufferCount)
{
// TransferHandleWaitIndex is the index of the oldest outstanding transfer.
*handleRef = handle = &transferParam->TransferHandles[transferParam->TransferHandleWaitIndex];
// Only wait, cancelling & freeing is handled by the caller.
handle->ReturnCode = ret = usb_reap_async_nocancel(handle->Context, transferParam->Test->Timeout);
if (ret < 0) goto Done;
// Mark this handle has no longer InUse.
handle->InUse = FALSE;
// When transfers ir successfully submitted, OutstandingTransferCount goes up; when
// they are completed it goes down.
//
transferParam->OutstandingTransferCount--;
// Move TransferHandleWaitIndex to the oldest outstanding transfer.
INC_ROLL(transferParam->TransferHandleWaitIndex, transferParam->Test->BufferCount);
}
Done:
return ret;
}