From: Neil Goldberg Newsgroups: comp.os.msdos.djgpp Subject: Re: spawning or system for DOS game?.. help me Date: Tue, 10 Aug 1999 10:03:01 +0100 Organization: The MITRE Corporation Lines: 43 Message-ID: <37AFEAC5.48AD@mitre.org> References: <7oak28$865$1 AT nnrp1 DOT deja DOT com> <7ogqna$o76$1 AT ctb-nnrp1 DOT saix DOT net> NNTP-Posting-Host: mm58842-pc.mitre.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Trace: top.mitre.org 934293652 7911 128.29.96.60 (10 Aug 1999 14:00:52 GMT) X-Complaints-To: usenet AT news DOT mitre DOT org NNTP-Posting-Date: 10 Aug 1999 14:00:52 GMT X-Mailer: Mozilla 3.04 (WinNT; I) To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp Reply-To: djgpp AT delorie DOT com Stefan Viljoen wrote: > > wrote in message > news:7oak28$865$1 AT nnrp1 DOT deja DOT com... > > how to make my game's background move while the character move > > according to arrorw keys and sound play at the same time? > > would it be a multithreading?... how to do this in DOS? > > I know how to do each of them ... but how do I do this at once? > > spawning?.. system("start ..")? which one ? > > thanks in advance ... > > I once managed something like this with no fancy stuff like you mention. > What I did was set up just one loop that has conditionals in it that key to > differrent speed allegro timers that I set up. For example, to keep the > character moving, part of my loop checked the "character timer" - when this > "ticked" I moved the character. Another kept count of how long the current > song was playing, when it ended the song length timer "ticked" and I started > up the next song in queue - etc. You can do this to the limit of the amount > of timers you are able to allocate. You can run through this loop hunderd or > thousands of times each second, the timers "ticking" at the correct pace to > keep it all looking real. If you look at any source for almost any DOS games > that you might be able to find, I think you will see that this is how > apparent "simultaneous" actions like this was carried out - everything is > actually done in sequence (HAS to be done in sequence - in a DOS system > there is usually one processor, one path to memory, one display card, etc.) > but so fast that it appears simultaneous (i. e. appears to look like > "multitasking" or multithreading). > > Hope this is accurate and helped some! > > -- > This message courtesy of > RylanNet rylan AT intekom DOT co DOT za > http://home.intekom.com/rylan/ > -- > StarWars for ever!. More information: In fact, even Windows and the programs that run in it use this method too; the computer is still only doing one thing at a time. Each process / thread gets a little bit of time CPU every once in a while. moogla