C++ USB communication delay - c++

Question

I use ftd3xx.dll to communicate with the device
The data read part and the data write part are divided into threads and used.
#include <thread>
#include <queue>
#include <array>
#include <windows.h>
using namespace std;
bool dataRead = false;
CRITICAL_SECTION sec;
queue< vector<unsigned short>> BufferQueue;
unsigned WINAPI Write(void* arg) {
int Width = 1000;
vector<unsigned short> data;
data.reserve(Width);
while (Opened)
{
while (dataRead)
{
if (BufferQueue.size() > 0) {
EnterCriticalSection(&sec);
data = BufferQueue.front();
BufferQueue.pop();
LeaveCriticalSection(&sec);
}
else
{
this_thread::sleep_for(2ms);
continue;
}
//wrtie something
}
if (!dataRead)
break;
}
_endthreadex(0);
return 0;
}
unsigned WINAPI Read(void* arg) {
int Width = 1000;
vector<unsigned short> data(Width);
BYTE* acReadBuf = new BYTE[Width];
ULONG ulBytesRead = 0;
int idx = 0;
Sleep(100);
while (dataRead)
{
ftStatus = FT_ReadPipe(ftHandle, CstReadPipeNo, acReadBuf, Width, &ulBytesRead, NULL);
if (FT_SUCCESS(ftStatus))
{
idx = 0;
for (int i = 0; i < Width; i++) {
data[i] = ((unsigned short)((unsigned short)acReadBuf[idx] | ((unsigned short)acReadBuf[idx + 1] << 8)));
idx += 2;
}
EnterCriticalSection(&sec);
if (BufferQueue.size() > 10000) {
queue< vector<unsigned short>> empty;
swap(BufferQueue, empty);
}
BufferQueue.push(data);
LeaveCriticalSection(&sec);
}
else
{
}
}
_endthreadex(0);
return 0;
}
void main() {
//start
InitializeCriticalSection(&sec);
dataRead = true;
HANDLE r_hThread = NULL;
unsigned r_threadID;
r_hThread = (HANDLE)_beginthreadex(NULL, 0, Read, NULL, 0, &r_threadID);
HANDLE w_hThread = NULL;
unsigned w_threadID;
w_hThread = (HANDLE)_beginthreadex(NULL, 0, Write, NULL, 0, &w_threadID);
//....///
//stop
dataRead = false;;
WaitForSingleObject(r_hThread, INFINITE);
WaitForSingleObject(w_hThread, INFINITE);
DeleteCriticalSection(&sec);
}
I want to queue the array directly, but first I am using it as a vector.
Importantly, data loss occurs when other programs are run or even calculators are run.
The same is true even if the device gives the data late or fast.
I would be grateful if someone could help me.