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#include <Windows.h>
#include <process.h>
#include <iostream>
#include <fstream>

class CNetworkLog
{
	std::ofstream m_file;
	CNetworkLog() {
		InitializeCriticalSection(&m_cs);
		m_file.open("nlog.txt", std::ios::app);
	};
	~CNetworkLog() {
		DeleteCriticalSection(&m_cs);
		m_file.close();
	};
	CNetworkLog(const CNetworkLog &clone) {};
	CNetworkLog& operator=(CNetworkLog &rhv){};	
	CRITICAL_SECTION m_cs;
public:	
	static CNetworkLog& getInstance() {
		static CNetworkLog instance;
		return instance;
	};	
	void WriteLog(const char * msg) {
		EnterCriticalSection(&m_cs);
		m_file << msg << std::endl;
		LeaveCriticalSection(&m_cs);
	}
};

unsigned int __stdcall threadFunc(void *args)
{
	CNetworkLog &log = CNetworkLog::getInstance();	
	log.WriteLog("test");
	_endthreadex(0);
	return 0;
}

int main()
{	
	const int max = 100;
	HANDLE hHandles[max];
	for (int i = 0; i < max; ++i) {
		hHandles[i] = (HANDLE)_beginthreadex(NULL, 0, &threadFunc, NULL, 0, 0);
	}	
	WaitForMultipleObjects(max, hHandles, TRUE, INFINITE);	
	for (int i = 0; i < max; ++i) {
		CloseHandle(hHandles[i]);
	}
	return 0;
}