Efficient.. "sendto"

#include <winsock2.h>
#include <windows.h>
#include <stdio.h>

#include "CTime.h"

class CClient
{
protected:
	SOCKET					m_socket;				// socket connection
	struct sockaddr_in		m_myAdr;				// client address
	struct sockaddr_in		m_adr;					// destination address

public:
	CClient(const char *hostName, const unsigned int port)
	{
		m_socket = INVALID_SOCKET;
		m_socket = socket(AF_INET, SOCK_DGRAM, 0);
		if (m_socket == INVALID_SOCKET)
		{
			throw "Can't create client socket";
		}

		m_myAdr.sin_family = AF_INET;
		m_myAdr.sin_port = 0;
		m_myAdr.sin_addr.s_addr = INADDR_ANY;
		if (bind(m_socket, (struct sockaddr *)&m_myAdr, sizeof(m_myAdr)) != 0)
		{
			throw "Can't bind client socket";
		}

		struct sockaddr_in destAdr;
		destAdr.sin_family = AF_INET;
		destAdr.sin_port = htons(port);
		destAdr.sin_addr.s_addr = inet_addr(hostName);
		if (destAdr.sin_addr.s_addr == INADDR_NONE)
		{
			throw "Can't find destination address";
		}
		m_adr = destAdr;

		/// flags the sockets as non-blocking
		u_long flag = 1;
		if (ioctlsocket(m_socket, FIONBIO, &flag) != 0)
		{
			throw "Can't ioctl socket";
		}
	}

	void process()
	{
		char buf[256];
		int bytes = sendto(m_socket, buf, 50, 0,
			(struct sockaddr *)&m_adr, sizeof(struct sockaddr_in));
	}
};


int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
	LPSTR lpCmdLine, int nCmdShow)
{
	/// init WSA
	WORD wVersionRequested;
	WSADATA wsaData;
	int err;
 	wVersionRequested = MAKEWORD( 2, 2 );
 	err = WSAStartup( wVersionRequested, &wsaData );

#define NBSOCKETS 2500
	CClient *clients[NBSOCKETS];
	for (unsigned int i = 0; i < NBSOCKETS; i++)
		clients = new CClient("127.0.0.1", 7000);

	while (1)
	{
		CTime ct;

		/// sending one packet per client:
		for (i = 0; i < NBSOCKETS; i++)
			clients->process();
		float e = ct.getElapsed();

		/// sleep a little (100 ms at worse)
		int sleep = 100 - (int)(e * 1000.0f);
		if (sleep < 10)
			sleep = 10;
		Sleep(sleep);

		char str[256];
		sprintf(str, "Elapsed: %.1f ms\n", e * 1000.0f);
		OutputDebugString(str);
	}

	return 0;
}