TInt DZeroCopyLoopbackDevice::RequestDataSend()
{
// Push our send buffer in to the queue
iSendQueue.Push();
// Trigger reception
NKern::Lock();
SendDataCallback();
NKern::Unlock();
return KErrNone;
}
void DZeroCopyLoopbackDevice::ReceiveDataCallback()
{
// Copy buffer from send queue (it's like our receive hardware) to receive queue
DCommsBuf* srcBuf = iSendQueue.HeadBuffer();
if(!iReceiveQueue.IsFull() && !iSendQueue.IsEmpty())
{
// Alloc a new buffer in to which we will copy the received (sent) buffer (mimicking DMA in the non zerocopy case)
DCommsBuf newBuf;
TInt result = iLdd->Pond().Alloc(newBuf);
if(result == KErrNone)
{
// Copy our buffer and set the new buffer's properties
TInt srcPayloadLength = srcBuf->Length();
newBuf.SetOffset(0);
newBuf.SetLength(srcPayloadLength);
// Do the copy
TUint8* srcPayloadPtr = srcBuf->Ptr();
TUint8* destPayloadPtr = newBuf.Ptr();
memcpy(destPayloadPtr, srcPayloadPtr, srcPayloadLength);
// Put the new buffer in the receive queue
DCommsBuf* destBuf = iReceiveQueue.TailBuffer();
*destBuf = newBuf;
iReceiveQueue.Push();
// Drop the incoming buffer
srcBuf->Free();
// Step the queue
iSendQueue.Pop();
}
// We can now complete any outstanding request for received data - if indeed we managed to alloc a receive buffer
if(iPendingRead && !iReceiveQueue.IsEmpty())
{
iPendingRead = FALSE;
// Tell LDD we're done
iLdd->ReceiveDataComplete(KErrNone);
}
}
}
void sim()
{
int j = 0;
int tickskip = 0, proctime = 0, taskskip = 0;
int tick;
int critT, critP;
TQueue queue;
printf("??????? ??????????? ???????? ?????\n");
critT = input(DIAP);
printf("??????? ??????????? ???????? ??????????\n");
critP = input(DIAP);
printf("??????? ?????????? ??????\n");
tick = input(9000);
if (tick < 20)
{
for (int i = 0; i < tick; i++)
{
if (TaskRand(critT))
{
if (!queue.IsFull())
{
queue.Put(1);
printf("????????? ??????\n");
}
else
{
taskskip++;
printf("?????? ?????????\n");
}
}
if (proctime != 0)
{
printf("????????? ???????????? ??????\n");
if (ProcRand(critP))
{
proctime = 0;
printf("?????? ??????????\n");
}
else
{
proctime++;
printf("?????? ??????????????\n");
}
}
else if (!queue.IsEmpty())
{
printf("????????? ?????? ??????\n");
queue.Push();
if (ProcRand(critP))
{
printf("?????? ??????????\n");
}
else
{
proctime++;
printf("?????? ??????????????\n");
}
}
else
{
tickskip++;
printf("????????? ???????????\n");
}
}
while (!queue.IsEmpty())
{
queue.Push();
j++;
}
}
else
{
for (int i = 0; i < tick; i++)
{
if (TaskRand(critT))
{
if (!queue.IsFull())
{
queue.Put(1);
}
else
{
taskskip++;
}
}
if (proctime != 0)
{
if (ProcRand(critP))
{
proctime = 0;
}
else
{
proctime++;
}
}
else if (!queue.IsEmpty())
{
queue.Push();
if (ProcRand(critP))
{
}
else
{
proctime++;
}
}
else
{
tickskip++;
}
}
while (!queue.IsEmpty())
{
queue.Push();
j++;
}
}
printf("????????? ? ???????: %d\n", j);
printf("????? ?????????: %d\n ????? ???????: %d\n", taskskip, tickskip);
}