• Announcements

    • khawk

      Download the Game Design and Indie Game Marketing Freebook   07/19/17

      GameDev.net and CRC Press have teamed up to bring a free ebook of content curated from top titles published by CRC Press. The freebook, Practices of Game Design & Indie Game Marketing, includes chapters from The Art of Game Design: A Book of Lenses, A Practical Guide to Indie Game Marketing, and An Architectural Approach to Level Design. The GameDev.net FreeBook is relevant to game designers, developers, and those interested in learning more about the challenges in game development. We know game development can be a tough discipline and business, so we picked several chapters from CRC Press titles that we thought would be of interest to you, the GameDev.net audience, in your journey to design, develop, and market your next game. The free ebook is available through CRC Press by clicking here. The Curated Books The Art of Game Design: A Book of Lenses, Second Edition, by Jesse Schell Presents 100+ sets of questions, or different lenses, for viewing a game’s design, encompassing diverse fields such as psychology, architecture, music, film, software engineering, theme park design, mathematics, anthropology, and more. Written by one of the world's top game designers, this book describes the deepest and most fundamental principles of game design, demonstrating how tactics used in board, card, and athletic games also work in video games. It provides practical instruction on creating world-class games that will be played again and again. View it here. A Practical Guide to Indie Game Marketing, by Joel Dreskin Marketing is an essential but too frequently overlooked or minimized component of the release plan for indie games. A Practical Guide to Indie Game Marketing provides you with the tools needed to build visibility and sell your indie games. With special focus on those developers with small budgets and limited staff and resources, this book is packed with tangible recommendations and techniques that you can put to use immediately. As a seasoned professional of the indie game arena, author Joel Dreskin gives you insight into practical, real-world experiences of marketing numerous successful games and also provides stories of the failures. View it here. An Architectural Approach to Level Design This is one of the first books to integrate architectural and spatial design theory with the field of level design. The book presents architectural techniques and theories for level designers to use in their own work. It connects architecture and level design in different ways that address the practical elements of how designers construct space and the experiential elements of how and why humans interact with this space. Throughout the text, readers learn skills for spatial layout, evoking emotion through gamespaces, and creating better levels through architectural theory. View it here. Learn more and download the ebook by clicking here. Did you know? GameDev.net and CRC Press also recently teamed up to bring GDNet+ Members up to a 20% discount on all CRC Press books. Learn more about this and other benefits here.

Archived

This topic is now archived and is closed to further replies.

Yanroy

Non-Blocking (?) sockets

1 post in this topic

For my project, I need to be able to make it accept incoming socket connections, but not WAIT for them... It needs to do other things while it is waiting for a new connection (like service other connections). I can''t use any threads either . This is going to be running under linux, but right now it is under win98. --------------------

You are not a real programmer until you end all your sentences with semicolons;

Yanroy@usa.com

Visit the ROAD Programming Website for more programming help.

0

Share this post


Link to post
Share on other sites
I believe what you are looking to do is to "mutliplex".

Multiplex - Relating to or being a system of simultaneous communication of two or more messages on the same wire or radio channel.

Ok this definition were if it were on the same "wire" but it applies to sockets. There is a function that can be found in unix/linux and even VC called "select" what this function does is check several sets of sockets for what they can do. More specifically can you read a socket, write to a socket, and does the socket have an exception (which means something bad happened, or OOB data is waiting).

If you add the socket that is connected to the port you are listening to, to the read set and select tells you it can be read from, accept will succeed without blocking (in other words a connection is waiting).

Here are some key words you will want to look at.
select - the function that multiplexes
struct fd_set - file descriptor set, you pass three of these to select
FD_SET - macro to add a socket to a fd_set structures list
FD_ZERO - clears a set to have it list nothing
FD_CLR - removes a single socket from the list
FD_ISSET - returns a boolean value that signifies if a socket is in a set.

A basic synopsis of what happens:
1. Create three "struct fd_set"''s one for reading, one for writing, one for exceptions.
2. Add those sockets you want to test for each catagory, also if you want to see if a connection is waiting add the socket that is bound to the listening port. (FD_SET macro is used to add the sockets to the fd_set''s)
3. Use the select function and pass the fd_sets to it.
4. Use the FD_ISSET macro to see if a socket is still in the set. (select removes those sockets that don''t apply to each catagory, in other words if there is no data waiting to be read from a socket, it will no longer be in the read set.)
5. If you want to test for a connection, FD_ISSET to see if the bound socket is still in the set.
6. Use whatever means is needed to get or send data, and accept the new connection if it is waiting.

Sorry if that isn''t clear, here are a few resources.
1. Beej''s socket tutorial - http://sol.te.net.ua/sockets/netsock.html - this has a small example of how select is used.
2. If you use VC look up the select function, it actually has a somewhat good explination of all its features!

Hope this helps!
-Omalacon
0

Share this post


Link to post
Share on other sites