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• Function calls to calls in windows api

  - by Apeee

  I am a beginner, and learning C, I find it hard to grasp the whole programming concept. so hopefully this would help to clear up some things along the way. When programming in windows, which is my aim for the time being, it is really hard for me to understand how windows communicate with the programs that run on it. A question i have been pondering about is how when you incorporate a function call which is in another memory location on the disk or memory(not a function you yourself wrote and is included in the compilation), especially the windows API, does the compiler know where the function location is so when the program is run it can call that function? For example, a very simple program that displays a window which reads hello world. You would have to call windows API functions to achieve such features as creating the window, its size, colors and so on... So basically what I am struggling to grasp is how the programs I write communicate with the platform, framework they are run on(generally windows for Windows API). Apart from clarification on this one above, i would love a resource that explains this concept further. Thanks for your time!

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• TimeoutException in simultaneous calls to WCF services from Silverlight application

  - by Alexander K.

  Analysing log files I've noticed that ~1% of service calls ended with TimeoutException on the Silverlight client side. The services (wcf) are quite simple and do not perform long computations. According the log all calls to the services are always processed in less that 1 sec (even when TimeoutException is occurred on the client!), so it is not server timeout. So what is wrong? Can it be configuration or network problem? How can I avoid it? What additional logging information can be helpful for localizing this issue? The only one workaround I've thought up is to retry service calls after timeout. I will appreciate any help on this issue! Update: On startup the application performs 17 service calls and 12 of them simultaneously (may it be cause of failure?). Update: WCF log has not contained useful information about this issue. It seems some service calls do not reach the server side.

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• Sun Grid Engine (SGE) / limiting simultaneous array job sub-tasks

  - by wfaulk

  I am installing a Sun Grid Engine environment and I have a scheduler limit that I can't quite figure out how to implement. My users will create array jobs that have hundreds of sub-tasks. I would like to be able to limit those jobs to only running a set number of tasks at the same time, independent of other jobs. Like I might have one array job that I want to run 20 tasks at a time, and another I want to run 50 tasks at a time, and yet another that I'm fine running without limit. It seems like this ought to be doable, but I can't figure it out. There's a max_aj_instances configuration option, but that appears to apply globally to all array jobs. I can't see any way to use consumable resources, as I'd need a "complex attribute" that is per-job, and that feature doesn't seem to exist. It didn't look like resource quotas would work, but now I'm not so sure of that. It says "A resource quota set defines a maximum resource quota for a particular job request", but it's unclear if an array job's sub-tasks' resource requests will be aggregated for the purposes of the resource quota. I'm going to play with this, but hopefully someone already knows outright.

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• Accepting more simultaneous keyboard inputs

  - by unknownthreat

  Sometimes, a normal computer keyboard will only accept user's inputs up to a certain key simultaneously. I got a logitech keyboard that can accept up to 3-4 key presses at the same time. The computer does not accept any more input if you press more than 4 keys for this keyboard. And it also depends on certain areas of your keyboard as well. Some locations allow more key to be pressed (like the arrow keys), while some locations permit you to press only 1-2 keys. This also differs from keyboard to keyboard as well. Some older keyboards only accept up 1-2 keys. This isn't problematic with usual office work, but when it comes to gaming. For instance, imagine a platform game, where you have to jump, attack, and control direction at the same time. This implies several key presses and some keyboards cannot accept such simultaneous input. However, I've tried this on several games and the amount of possible keyboard inputs seem to be also different. Therefore, we have two issues: Keyboards have different amount of simultaneous inputs. Some games can accept more keyboard inputs than other games. At first, I thought this is hardware only problem, but why do some programs behave differently? Why some programs can accept more keyboard inputs than other programs? So how can we write our programs to accept more keyboard inputs?

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• How to play simultaneous multiply audio sources in Silverlight

  - by Shurup

  I want to play simultaneous multiply audio sources in Silverlight. So I've created a prototype in Silverlight 4 that should play a two mp3 files containing the same ticks sound with an intervall 1 second. So these files must be sounded as one sound if they will be played together with any whole second offsets (0 and 1, 0 and 2, 1 and 1 seconds, etc.) I my prototype I use two MediaElement (me and me2) objects. DateTime startTime; private void Play_Clicked(object sender, RoutedEventArgs e) { me.SetSource(new FileStream(file1), FileMode.Open))); me2.SetSource(new FileStream(file2), FileMode.Open))); var timer = new DispatcherTimer { Interval = TimeSpan.FromMilliseconds(1) }; timer.Tick += RefreshData; timer.Start(); } First file should be played at 00:00 sec. and the second in 00:02 second. void RefreshData(object sender, EventArgs e) { if(me.CurrentState != MediaElementState.Playing) { startTime = DateTime.Now; me.Play(); return; } var elapsed = DateTime.Now - startTime; if(me2.CurrentState != MediaElementState.Playing && elapsed >= TimeSpan.FromSeconds(2)) { me2.Play(); ((DispatcherTimer)sender).Stop(); } } The tracks played every time different and not simultaneous as they should (as one sound).

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• Best wrapper for simultaneous API requests?

  - by bluebit

  I am looking for the easiest, simplest way to access web APIs that return either JSON or XML, with concurrent requests. For example, I would like to call the twitter search API and return 5 pages of results at the same time (5 requests). The results should ideally be integrated and returned in one array of hashes. I have about 15 APIs that I will be using, and already have code to access them individually (using simple a NET HTTP request) and parse them, but I need to make these requests concurrent in the easiest way possible. Additionally, any error handling for JSON/XML parsing is a bonus.

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• Web Services: more frequent "small" calls, or less frequent "big" calls

  - by Klay

  In general, is it better to have a web application make lots of calls to a web service getting smaller chunks of data back, or to have the web app make fewer calls and get larger chunks of data? In particular, I'm building a Silverlight app that needs to get large amounts of data back from the server in response to a query created by a user. Each query could return anywhere from a few hundred records to a few thousand. Each record has around thirty fields of mostly decimal-type data. I've run into the situation before where the payload size of the response exceeded the maximum allowed by the service. I'm wondering whether it's better (more efficient for the server/client/web service) to cut this payload vertically--getting all values for a single field with each call--or horizontally--getting batches of complete records with each call. Or does it matter?

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• cdc-acm driver: This device cannot do calls on its own. It is not a modem

  - by Sorcrer

  I am using Beagleboard-xm with 3.12 Kernel and ubuntu rootfs from Robert Nelson's site. I use a Telit HE910 GPS+GSM modem along with my project .So as per the HW user guide i have to apply a logic high for 5s on the input of this modem for enabling it So when I does this by toggling the gpio pin for 5s using a script I'm getting some messages on the terminal I am sure this message comes from the driver in usb/class/cdc-acm.c but couldn't find the reason behind this? How can I solve this issue?? root@arm:~# ./modem_on.sh Turning on Telit modem ...... going to sleep and toggle [ 70.791381] cdc_acm 1-2:1.0: This device cannot do calls on its own. It is not a modem. [ 74.390258] cdc_acm 1-2:1.0: This device cannot do calls on its own. It is not a modem. [ 74.406890] cdc_acm 1-2:1.2: This device cannot do calls on its own. It is not a modem. [ 74.462188] cdc_acm 1-2:1.4: This device cannot do calls on its own. It is not a modem. [ 74.478363] cdc_acm 1-2:1.6: This device cannot do calls on its own. It is not a modem. [ 74.495269] cdc_acm 1-2:1.8: This device cannot do calls on its own. It is not a modem. [ 74.510040] cdc_acm 1-2:1.10: This device cannot do calls on its own. It is not a modem. [ 74.530090] cdc_acm 1-2:1.12: This device cannot do calls on its own. It is not a modem. [ 74.619720] cdc_acm 1-2:1.0: This device cannot do calls on its own. It is not a modem. [ 74.634429] cdc_acm 1-2:1.2: This device cannot do calls on its own. It is not a modem. [ 74.649475] cdc_acm 1-2:1.4: This device cannot do calls on its own. It is not a modem. [ 74.664459] cdc_acm 1-2:1.6: This device cannot do calls on its own. It is not a modem. [ 74.678741] cdc_acm 1-2:1.8: This device cannot do calls on its own. It is not a modem. [ 74.693389] cdc_acm 1-2:1.10: This device cannot do calls on its own. It is not a modem. [ 74.708099] cdc_acm 1-2:1.12: This device cannot do calls on its own. It is not a modem. Script complete .......... The realted necessary portion of dmesg is below [ 30.623107] init: plymouth-upstart-bridge main process ended, respawning [ 70.629943] usb 1-2: new high-speed USB device number 2 using ehci-omap [ 70.782501] usb 1-2: config 1 interface 0 altsetting 0 endpoint 0x81 has an invalid bInterval 255, changing to 11 [ 70.782592] usb 1-2: New USB device found, idVendor=058b, idProduct=0041 [ 70.782623] usb 1-2: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [ 70.791381] cdc_acm 1-2:1.0: This device cannot do calls on its own. It is not a modem. [ 70.801483] cdc_acm 1-2:1.0: ttyACM0: USB ACM device [ 73.041625] usb 1-2: USB disconnect, device number 2 [ 74.209930] usb 1-2: new high-speed USB device number 3 using ehci-omap [ 74.369049] usb 1-2: New USB device found, idVendor=1bc7, idProduct=0021 [ 74.369110] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 74.369140] usb 1-2: Product: Telit Wireless Module [ 74.369171] usb 1-2: Manufacturer: Telit wireless solutions [ 74.369201] usb 1-2: SerialNumber: 357164042197668 [ 74.390258] cdc_acm 1-2:1.0: This device cannot do calls on its own. It is not a modem. [ 74.400207] cdc_acm 1-2:1.0: ttyACM0: USB ACM device [ 74.406890] cdc_acm 1-2:1.2: This device cannot do calls on its own. It is not a modem. [ 74.416900] cdc_acm 1-2:1.2: ttyACM1: USB ACM device [ 74.462188] cdc_acm 1-2:1.4: This device cannot do calls on its own. It is not a modem. [ 74.472259] cdc_acm 1-2:1.4: ttyACM2: USB ACM device [ 74.478363] cdc_acm 1-2:1.6: This device cannot do calls on its own. It is not a modem. [ 74.488372] cdc_acm 1-2:1.6: ttyACM3: USB ACM device [ 74.495269] cdc_acm 1-2:1.8: This device cannot do calls on its own. It is not a modem. [ 74.505279] cdc_acm 1-2:1.8: ttyACM4: USB ACM device [ 74.510040] cdc_acm 1-2:1.10: This device cannot do calls on its own. It is not a modem. [ 74.520141] cdc_acm 1-2:1.10: ttyACM5: USB ACM device [ 74.530090] cdc_acm 1-2:1.12: This device cannot do calls on its own. It is not a modem. [ 74.540283] cdc_acm 1-2:1.12: ttyACM6: USB ACM device [ 74.619720] cdc_acm 1-2:1.0: This device cannot do calls on its own. It is not a modem. [ 74.629455] cdc_acm 1-2:1.0: ttyACM0: USB ACM device [ 74.634429] cdc_acm 1-2:1.2: This device cannot do calls on its own. It is not a modem. [ 74.644042] cdc_acm 1-2:1.2: ttyACM1: USB ACM device [ 74.649475] cdc_acm 1-2:1.4: This device cannot do calls on its own. It is not a modem. [ 74.659027] cdc_acm 1-2:1.4: ttyACM2: USB ACM device [ 74.664459] cdc_acm 1-2:1.6: This device cannot do calls on its own. It is not a modem. [ 74.674133] cdc_acm 1-2:1.6: ttyACM3: USB ACM device [ 74.678741] cdc_acm 1-2:1.8: This device cannot do calls on its own. It is not a modem. [ 74.688415] cdc_acm 1-2:1.8: ttyACM4: USB ACM device [ 74.693389] cdc_acm 1-2:1.10: This device cannot do calls on its own. It is not a modem. [ 74.703186] cdc_acm 1-2:1.10: ttyACM5: USB ACM device [ 74.708099] cdc_acm 1-2:1.12: This device cannot do calls on its own. It is not a modem. [ 74.717895] cdc_acm 1-2:1.12: ttyACM6: USB ACM device `

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• how do i use strace to know about system calls in my C program

  - by Adi

  Hi all, I wanted to know how can i use strace function to trace system calls in my C program and also use it for debugging my code. regs adi

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• IPhone SDK handling calls

  - by Yasir Hussain

  Is there any way to handle call events in IPhone? i.e. Log calls and sms in my app, block unwanted numbers, etc. I know the IPhone SDK doesn't provide that but I have been googling this and what I got was an app called iBlackList. Although it runs on jail-broken phones but it does my required functionality. I wonder how? Has anyone idea about how these tasks can be accomplished?

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• Proxied calls not working as expected

  - by AndyH

  I have been modifying an application to have a cleaner client/server split to allow for load splitting and resource sharing etc. Everything is written to an interface so it was easy to add a remoting layer to the interface using a proxy. Everything worked fine. The next phase was to add a caching layer to the interface and again this worked fine and speed was improved but not as much as I would have expected. On inspection it became very clear what was going on. I feel sure that this behavior has been seen many times before and there is probably a design pattern to solve the problem but it eludes me and I'm not even sure how to describe it. It is easiest explained with an example. Let's imagine the interface is interface IMyCode { List<IThing> getLots( List<String> ); IThing getOne( String id ); } The getLots() method calls getOne() and fills up the list before returning. The interface is implemented at the client which is proxied to a remoting client which then calls the remoting server which in turn calls the implementation at the server. At the client and the server layers there is also a cache. So we have :- Client interface | Client cache | Remote client | Remote server | Server cache | Server interface If we call getOne("A") at the client interface, the call is passed to the client cache which faults. This then calls the remote client which passes the call to the remote server. This then calls the server cache which also faults and so the call is eventually passed to the server interface which actually gets the IThing. In turn the server cache is filled and finally the client cache also. If getOne("A") is again called at the client interface the client cache has the data and it gets returned immediately. If a second client called getOne("B") it would fill the server cache with "B" as well as it's own client cache. Then, when the first client calls getOne("B") the client cache faults but the server cache has the data. This is all as one would expect and works well. Now lets call getLots( [ "C", "D" ] ). This works as you would expect by calling getOne() twice but there is a subtlety here. The call to getLots() cannot directly make use of the cache. Therefore the sequence is to call the client interface which in turn calls the remote client, then the remote server and eventually the server interface. This then calls getOne() to fill the list before returning. The problem is that the getOne() calls are being satisfied at the server when ideally they should be satisfied at the client. If you imagine that the client/server link is really slow then it becomes clear why the client call is more efficient than the server call once the client cache has the data. This example is contrived to illustrate the point. The more general problem is that you cannot just keep adding proxied layers to an interface and expect it to work as you would imagine. As soon as the call goes 'through' the proxy any subsequent calls are on the proxied side rather than 'self' side. Have I failed to learn or not learned something correctly? All this is implemented in Java and I haven't used EJBs. It seems that the example may be confusing. The problem is nothing to do with cache efficiencies. It is more to do with an illusion created by the use of proxies or AOP techniques in general. When you have an object whose class implements an interface there is an assumption that a call on that object might make further calls on that same object. For example, public String getInternalString() { return InetAddress.getLocalHost().toString(); } public String getString() { return getInternalString(); } If you get an object and call getString() the result depends where the code is running. If you add a remoting proxy to the class then the result could be different for calls to getString() and getInternalString() on the same object. This is because the initial call gets 'deproxied' before the actual method is called. I find this not only confusing but I wonder how I can control this behavior especially as the use of the proxy may be by a third party. The concept is fine but the practice is certainly not what I expected. Have I missed the point somewhere?

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• libssh2 and simultaneous connections

  - by Florian Margaine

  I'm writing a node.js C++ module using the C library libssh2. The module is supposed to be a bridge to connect to SSH over HTTPS. Right now, I'm still in the design/learning phase of v8 API and C++, and I have a design question: libssh2 is a C library, all its methods are global. From what I see in the examples, libssh2 can only handle one connection at a time. If I want to allow simultaneous connections to different SSH servers, do I have to fork a process to completely separate the libssh2 "instances", or is forking a thread enough? I don't know enough of the separation limit used there. Any idea on how to handle this is appreciated.

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• Google Analytics Content Experiments for non-simultaneous tests

  - by mnort9

  I really like how Google Analytics displays the results of content experiments. However, it seems the tool only works for simultaneous tests. I'd like to use the tool without implementing the page variation code into my site. For example, I want to test copy on an ecommerece category page. The original page variation would be the current page for the past 2500 visits. After making the copy changes, the new variation would be for the next 2500 visits. I realize I can simply record the metrics before and after each variation, but I'd like to take advantage of Google's presentation of the experiment. Is it possible to use the Content Experiments in this way?

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• Image editor that allows multiple, separate, simultaneous crop selections to be saved? (looking for

  - by Rob

  Is there an image editor that allows you to select several crop regions and save each one as an individual file? Rather than having to load up the original image each time and do the cropping of each area and saving. This would be useful if you are using the master, original image for several new purposes, or if you are scanning in several separate items at once.

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• C system calls open / read / write / close problem.

  - by Andrei Ciobanu

  Hello, given the following code (it's supposed to write "hellowolrd" in a "helloworld" file, and then read the text): #include <fcntl.h> #include <sys/types.h> #include <sys/stat.h> #define FNAME "helloworld" int main(){ int filedes, nbytes; char buf[128]; /* Creates a file */ if((filedes=open(FNAME, O_CREAT | O_EXCL | O_WRONLY | O_APPEND, S_IRUSR | S_IWUSR)) == -1){ write(2, "Error1\n", 7); } /* Writes hellow world to file */ if(write(filedes, FNAME, 10) != 10) write(2, "Error2\n", 7); /* Close file */ close(filedes); if((filedes = open(FNAME, O_RDONLY))==-1) write(2, "Error3\n", 7); /* Prints file contents on screen */ if((nbytes=read(filedes, buf, 128)) == -1) write(2, "Error4\n", 7); if(write(1, buf, nbytes) != nbytes) write(2, "Error5\n", 7); /* Close rile afte read */ close(filedes); return (0); } The first time i run the program, the output is: helloworld After that every time I to run the program, the output is: Error1 Error2 helloworld I don't understand why the text isn't appended, as I've specified the O_APPEND file. Is it because I've included O_CREAT ? It the file is already created, shouldn't O_CREAT be ignored ?

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• Problem with function calls [javascript]

  - by Samuel

  <script language="javascript"> function toggle(id) { alert('call'); if (document.getElementById(id).style.display == "none") { alert('now visible'); document.getElementById(id).style.display = ""; } else { alert('now invisible'); document.getElementById(id).style.display = "none"; } } </script> </head> <body onload="toggle('image1');alert('test_body');toggle('image2')"> <script language="javascript"> alert('test_pre_function'); toggle('image1'); alert('test_after_function'); toggle('image2'); </script> Looks like a lot of code but it's pretty simple so i think most of you won't have troubles with it. toggle() should toggle the display status of divs containing images. When the user enters the site the divs should hide, when everything is loaded the divs should show up. (onload) Strangely enough, the funtion in the body (not in the body tag) only work half, i get and alert 'test_pre_function' and i get an alert 'call' (out of the function), but that's it. The code in the body tag runs just fine. I find this weird because it's supposed to do exactly the same twice and one time it runs, another time not, so i guess i must have made some stupid mistake. Thanks for any help!

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• Queuing rpc calls

  - by alfa64

  i'm designing a system wich listen to json rpc calls from clients, piles it up inside a list, and if it gets full it should store them in a DB and keep recieving calls. My original plan is to listen to the rpc calls from Perl with the json-rpc and put them in the array. The clients do some long polling in another server to get responses as they appear. What is this blocking/noblocking thing? Should i do a script for node.js to listen to the calls? What do you think is a good practice in this case? The objective is to listen as much calls as possible.

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• Problem with simultaneous key presses in Sony -Viao laptop

  - by Microkernel

  I got a new sony viao EB14 laptop last week. This laptop has a problem with the keyboard. While playing games involving 3 or more simultaneous key presses, the keyboard fails to respond to more than 2 simultaneous key presses. Please help.

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• Emacs protection against simultaneous editing by same user

  - by Peter Eisentraut

  Emacs has elaborate protection against simultaneous editing by two different users. If there a way to have that same facility for protecting against simultaneous editing by the same user? With lots of windows and workspaces open, it's easy to reopen a file that you already have open somewhere else. But because it does not detect a lock conflict when you open the file, you will only learn about the collision when you save.

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• Can we run two simultaneous non-nested loops in Perl?

  - by Mike

  Part of my code goes like this: while(1){ my $winmm = new Win32::MediaPlayer; $winmm->load('1.mp3'); $winmm->play; $winmm->volume(100); Do Some Stuff; last if some condition is met; } Problem is: I want the music to be always on when I'm in the Do Some Stuff stage in the while loop. But the length of the music is so short that it will come to a full stop before I go to the next stage, so I want the music to repeat itself, but the Win32::Mediaplayer module does not seem to have a repeat mode, so I'm thinking of doing an infinite loop for the music playing part. Like this: while(1){ my $winmm = new Win32::MediaPlayer; $winmm->load('1.mp3'); $winmm->play; $winmm->volume(100); } while(2){ Do some stuff; last if some condition is met } But based on my current Perl knowledge if I'm in the while(1) part, I can never go to the while(2) part. Even if it comes to a nested loop, I have to do something to break out of the inside loop before going to the other part of the outside loop. The answer to my question "Can we run two simultaneous non-nested loops in Perl?" may be a NO, but I assume there is some way of handling such situation. Correct me if I'm wrong. Thanks as always for any comments/suggestions :) UPDATE I really appreciate the help from everyone. Thanks :) So the answer to my question is a YES, not a NO. I'm happy that I've learned how to use fork() and threads to solve a real problem :)

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• Cannot FTP without simultaneous SSH connection?

  - by Lucas

  I'm trying to set up an old box as a backup server (running 10.04.4 LTS). I intend to use 3rd party software on my PC to periodically connect to my server via FTP(S) and to mirror certain files. For some reason, all FTP connection attempts fail UNLESS I'm simultaneously connected via SSH. For example, if I use putty to test the connection to port 21, the system hangs and times out. I get: 220 Connected to LeServer USER lucas 331 Please specify the password. PASS [password] <cursor> However, when I'm simultaneously logged in (in another session) everything works: 220 Connected to LeServer USER lucas 331 Please specify the password. PASS [password] 230 Login successful. Basically, this means that my software will never be able to connect on its own, as intended. I know that the correct port is open because it works (sometimes) and nmap gives me: Starting Nmap 5.00 ( http://nmap.org ) at 2012-03-20 16:15 CDT Interesting ports on xx.xxx.xx.x: Not shown: 995 closed ports PORT STATE SERVICE 21/tcp open ftp 22/tcp open ssh 53/tcp open domain 139/tcp open netbios-ssn 445/tcp open microsoft-ds Nmap done: 1 IP address (1 host up) scanned in 0.15 seconds My only hypothesis is that this has something to do with iptables. Maybe it's allowing only established connections? I don't think that's how I set it up, but maybe? Here's my iptables rules for INPUT: lucas@rearden:~$ sudo iptables -L INPUT Chain INPUT (policy DROP) target prot opt source destination fail2ban-ssh tcp -- anywhere anywhere multiport dports ssh ufw-before-logging-input all -- anywhere anywhere ufw-before-input all -- anywhere anywhere ufw-after-input all -- anywhere anywhere ufw-after-logging-input all -- anywhere anywhere ufw-reject-input all -- anywhere anywhere ufw-track-input all -- anywhere anywhere ACCEPT tcp -- anywhere anywhere tcp dpt:ftp I'm using vsftpd. Any thoughts/resources on how I could fix this? L

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• Simultaneous remote connections

  - by user3215

  Is there any package for Ubuntu which allows me to connect to remote computer without disturbing or terminating others who have already connected to that server or who are accessing the computer directly?. I remember I did this in Windows Server 2003 installing Terminal Server when I was doing my course which allowed multiple clients to connect to the server simultaneously with no disturbance to clients and even direct access to server. Is there any package like this for Ubuntu desktops?

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• Simultaneous Animation for a GameObject - Unity3D

  - by Fahim Ali Zain

  Its my second week with Unity. I am doing a 2D game and I have a small GameObject which should change its sprite along with following a definite path defined in Animation Curves. I did both of them in separate .anim files since the transform animation had many keyframes, i thought it wont be good to put the '2' sprite keyframe repeatedly along side the transform keyframe. But the problem is, I cant get it both working together at the same time. I dont want any blending because the animation is timed well already. Also, I tried deleting the sprite change animation and tried it under script changing the SpriteRenderer.Sprite property under Update(); but it works only when the Animator component is disabled in the GameObject. Any Solutions ? :)

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• Simultaneous AI in turn based games

  - by Eduard Strehlau

  I want to hack together a roguelike. Now I thought about entity and world representation and got to a quite big problem. If you want all the AI to act simultaneously you would normally(in cellular automa for examble) just copy the cell buffer and let all action of indiviual cells depend on the copy. Actions which are not valid anymore after some cell before the cell you are currently operating on changed the original enviourment(blocking the path) are just ignored or reapplied with the "current"(between turns) environment. After all cells have acted you copy the current map to the buffer again. Now for an environment with complex AI and big(datawise) entities the copying would take too long. So I thought you could put every action and entity makes into a que(make no changes to the environment) and execute the whole que after everyone took their move. Every interaction on this que are realy interacting entities, so if a entity tries to attack another entity it sends a message to it, the consequences of the attack would be visible next turn, either by just examining the entity or asking the entity for data. This would remove problems like what happens if an entity dies middle in the cue but got actions or is messaged later on(all messages would go to null, and the messages from the entity would either just be sent or deleted(haven't decided yet) But what would happen if a monster spawns a fireball which by itself tracks the player(in the same turn). Should I add the fireball to the enviourment beforehand, so make a change to the environment before executing the action list or just add the ball to the "need updated" list as a special case so it doesn't exist in the environment and still operates on it, spawing after evaluating the action list? Are there any solutions or papers on this subject which I can take a look at? EDIT: I don't need information on writing a roguelike I need information on turn based ai in respective to a complex enviourment.

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• Simulating simultaneous entities

  - by Steven Jeuris

  Consider the need to simulate a set of entitities in an accurate way. All entities exist in an artificial timeline. Within 'steps' of this timeline, all entities can do certain operations. It is imperative that timed events, are handled accurately, and not in processing order. So simple threading isn't a proper simulation, nor is procedurally walking across all entities. Processing may be slow, accuracy is key here. I have some ideas how to implement this myself, but most likely something like this has been done before. Are there any frameworks available for these purposes? Is there any particular paradigm more suitable?

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