Socket does not accept connections

Socket does not accept connections

I have a server socket accepting client socket connections. Accept is in a
thread
socket creation
int ServerSocket::CreateSocket(int port)
{
listenfd = 0;
struct sockaddr_in serv_addr;
unsigned long iMode = 1;
listenfd = socket(AF_INET, SOCK_STREAM, 0);
memset(&serv_addr, '0', sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
serv_addr.sin_port = htons(port);
ioctlsocket(listenfd, FIONBIO, &iMode);
if (bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr)) < 0)
{
return 0;
}
if (listen(listenfd, 20) < 0)
{
return 0;
}
return listenfd;
}
Socket Accept
void ServerSocket::AcceptClients_1(void * p)
{
struct sockaddr_in cli_addr;
// get a pointer to the ServerSocket object
ServerSocket * pThis = (ServerSocket *)p;
int iResult, cli_len;
cli_len = sizeof(cli_addr);
struct timeval tv = { 0, 1000 };
SOCKET s = pThis->GetSocket();
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(s, &rfds);
while (!pThis->ShutDownRequested)
{
iResult = select(s+1, &rfds, (fd_set *) 0, (fd_set *) 0, &tv);
if(iResult > 0)
{
// never comes here
SOCKET sclient = accept(s, (struct sockaddr *)&cli_addr,
&cli_len);
}
else if (iResult == 0) /// timeout
{
continue;
}
// error comes here are going to accept 2nd time
DWORD dwError = GetLastError();
return;
}
}
The code comes on select(). Returns 0 the first time but second time
always returns -1 with error 10022. I don't understand why. Please help.