C++ Visual Studio 2010 - Using Threads, Deque And Handlers - windows

Question

I'm trying to use multiple threads in an application that reads out of a large file.
I want to read from the file in the main thread and put each line into a deque called countedAddresses.
The I want multiple threads to pick lines out of countedAddresses and pull all of the email addresses out of them and place them in a deque called resolvedAddresses.
At the moment this all works if there is only one resolveAddressThread running, but if I run two I get heap corruption errors.
I launch the threads with:
_beginthread( resolveAddressThread, 0, NULL );
_beginthread( resolveAddressThread, 0, NULL );
Here is the thread code:
unsigned int linesCounted, linesResolved, linesProcessed;
std::deque<std::string> countedAddresses;std::deque<std::string> resolvedAddresses;
HANDLE linesCMutex, linesRMutex, linesRCMutex;
void resolveAddressThread(void* pParams)
{
string fileLine= "";
while(1)
{
WaitForSingleObject(linesCMutex, INFINITE);
WaitForSingleObject(linesRCMutex, INFINITE);
if (linesCounted>linesResolved)
{
if (countedAddresses.size()!=0)
{
fileLine = countedAddresses.front();
countedAddresses.pop_front();
ReleaseMutex(linesRCMutex);
ReleaseMutex(linesCMutex);
}
else
{
ReleaseMutex(linesRCMutex);
ReleaseMutex(linesCMutex);
Sleep(1000);
}
}
else
{ cout<<"All lines in the file have been processed."<<endl;
ReleaseMutex(linesRCMutex);
ReleaseMutex(linesCMutex);
break;}
if (fileLine.length()>1)
{
string::iterator strIter;
string buffer;
int tabCount=0;
bool useFlag =false, keepFlag = false, stopFlag = false;
buffer.clear();
for(strIter=fileLine.begin(); strIter!=fileLine.end(); ++strIter)
{
if (*strIter == '\t')
{
++tabCount;
}
if (tabCount == 10)
{
if ('\"'== *strIter)
{
useFlag=!useFlag;
}
else if (useFlag && *strIter > 0)
{
if (*strIter == '#')
{
buffer+=*strIter;
keepFlag = true;
}
else if ((*strIter ==' '||*strIter ==';')&& keepFlag)
{
if (buffer.at(buffer.length()-1)=='.')
{buffer = buffer.substr(0, buffer.length() - 1);}
WaitForSingleObject(linesRMutex, INFINITE);
resolvedAddresses.push_back(buffer);
ReleaseMutex(linesRMutex);
buffer.clear();
keepFlag = false;
}
else if (*strIter ==' '||*strIter ==';')
{
buffer.clear();
keepFlag = false;
}
else
{
buffer+=*strIter;
}
}
}
if (tabCount ==11 && keepFlag==true)
{
if (buffer.at(buffer.length()-1)=='.')
{buffer = buffer.substr(0, buffer.length() - 1);}
WaitForSingleObject(linesRMutex, INFINITE);
resolvedAddresses.push_back(buffer);
ReleaseMutex(linesRMutex);
buffer.clear();
keepFlag = false;
}
}
WaitForSingleObject(linesRCMutex, INFINITE);
++linesResolved;
ReleaseMutex(linesRCMutex);
fileLine.clear();
}
}
}
Please let me know where I am going wrong.
Thanks,
ANkh