Синхронизация параллельных потоков в WINAPI

#include <windows.h> 
#include <iostream> 
#include <string> 
#include <process.h> 
using namespace std;
    
CRITICAL_SECTION cs;
UINT WINAPI Thread1(void *pString) {
    char  *pLexema;
    EnterCriticalSection(&cs);
    pLexema = strtok((char*) pString," ");
    cout << "Input string: ";
    cin.getline(pLexema, 80);
    LeaveCriticalSection(&cs);
    return 0; 
} 
 
UINT WINAPI Thread2(void *pString) {
    int  i = 0;
    int j2 = 0;
    char  *pLexema;
    pLexema = strtok((char*) pString," ");
    for (int i=0; i<80; i++) 
    {
        EnterCriticalSection(&cs);
        if (pLexema[i] == 'b' || pLexema[i] == 'B')
        {
            pLexema[i]='0'; 
        } 
    LeaveCriticalSection(&cs);
    }
    return 0; 
} 
 
UINT WINAPI Thread3(void *pString) {
    char  *pLexema;
    EnterCriticalSection(&cs);
    pLexema = strtok((char*) pString," ");
    cout << "Stroka:"<<pLexema;
    LeaveCriticalSection(&cs);
    return 0; 
} 
 
int main(int argc, char** argv)
{
    char  sentence[80];
    HANDLE  hThread1,hThread2,hThread3;
    UINT  IDThread;
    InitializeCriticalSection(&cs);
    
    hThread1 = (HANDLE) _beginthreadex(NULL, 0, Thread1, sentence, 0, &IDThread);
    if (hThread1 == NULL)     return 0;
 
    DWORD res3 = WaitForSingleObject(hThread1,5000);
    hThread2 = (HANDLE) _beginthreadex(NULL, 0, Thread2, sentence, 0, &IDThread);
    if (hThread2 == NULL)     return 0;
    
    DWORD res4 = WaitForSingleObject(hThread2, 5000);
    
    hThread3 = (HANDLE) _beginthreadex(NULL, 0, Thread3, sentence, 0, &IDThread);
    if (hThread3 == NULL)     return 0;
    DWORD res5 = WaitForSingleObject(hThread3, 5000);
    
    return 0;
}