select() 에서 block된 상태에서 thread 종료 시 block을 풀어주는 방법??

boolean WaitUntilSocketIsReady(SOCKET a_socket, boolean* a_isCanceled)
{
 	while ( !*a_isCanceled )
	{
		int result = -1;
		fd_set fdSet;
		struct timeval tval;
		int isFdSet = 0;
 
		FD_ZERO(&fdSet);
		FD_SET(a_socket, &fdSet);
 
		tval.tv_sec = 1;
		tval.tv_usec = 0;
 
		result = select(a_socket + 1, &fdSet, NULL, NULL, &tval);
		if ( result == 0 )
		{
			continue;
		}
 
		if ( result == -1 )
		{
			PERROR("fail to select. errno: %d\n", errno);
			return FALSE;
		}
 
		isFdSet = FD_ISSET(a_socket, &fdSet);
		return isFdSet;
 
	}
 
	PERROR("canceled by user");
 
	return FALSE;
}