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• Lazy/deferred loading of a CollectionViewSource?

  - by Shimmy

  When you create a CollectionViewSource in the Resources section, is the set Source loaded when the resources are initalized (i.e. when the Resources holder is inited) or when data is bound? Is there a xamly way to make a CollectionViewSource lazy-load? deferred-load? explicit-load?

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• Postfix - suspend domain from which deferred status was received?

  - by Al Bundy

  Is there a possibility to make Postfix stop trying (for a period of time) to send emails to a domain from which it received a deferred response? Currently my Postfix goes through each address in the queue. Please see the below example. At 09:48:32 the status=deferred appears. After this Postfix should stop trying to send stuff to the yahoo.com domain. Jun 6 09:48:20 mailer postfix/smtp[8644]: C779A233C0: to=<[email protected]>, relay=mta7.am0.yahoodns.net[98.138.112.35]:25, delay=37163, delays=36519/638/1.2/4.9, dsn=2.0.0, status=sent (250 ok dirdel 5/0) Jun 6 09:48:20 mailer postfix/smtp[8644]: C779A233C0: to=<[email protected]>, relay=mta7.am0.yahoodns.net[98.138.112.35]:25, delay=37163, delays=36519/638/1.2/4.9, dsn=2.0.0, status=sent (250 ok dirdel 5/0) Jun 6 09:48:20 mailer postfix/smtp[8644]: C779A233C0: to=<[email protected]>, relay=mta7.am0.yahoodns.net[98.138.112.35]:25, delay=37163, delays=36519/638/1.2/4.9, dsn=2.0.0, status=sent (250 ok dirdel 5/0) Jun 6 09:48:30 mailer postfix/smtp[8643]: C779A233C0: to=<[email protected]>, relay=mta7.am0.yahoodns.net[63.250.192.46]:25, delay=37173, delays=36519/645/1.4/7.4, dsn=2.0.0, status=sent (250 ok dirdel 5/0) Jun 6 09:48:30 mailer postfix/smtp[8643]: C779A233C0: to=<[email protected]>, relay=mta7.am0.yahoodns.net[63.250.192.46]:25, delay=37173, delays=36519/645/1.4/7.4, dsn=2.0.0, status=sent (250 ok dirdel 5/0) Jun 6 09:48:30 mailer postfix/smtp[8643]: C779A233C0: to=<[email protected]>, relay=mta7.am0.yahoodns.net[63.250.192.46]:25, delay=37173, delays=36519/645/1.4/7.4, dsn=2.0.0, status=sent (250 ok dirdel 5/0) Jun 6 09:48:30 mailer postfix/smtp[8643]: C779A233C0: to=<[email protected]>, relay=mta7.am0.yahoodns.net[63.250.192.46]:25, delay=37173, delays=36519/645/1.4/7.4, dsn=2.0.0, status=sent (250 ok dirdel 5/0) Jun 6 09:48:30 mailer postfix/smtp[8643]: C779A233C0: to=<[email protected]>, relay=mta7.am0.yahoodns.net[63.250.192.46]:25, delay=37173, delays=36519/645/1.4/7.4, dsn=2.0.0, status=sent (250 ok dirdel 5/0) Jun 6 09:48:32 mailer postfix/smtp[8644]: C779A233C0: host mta6.am0.yahoodns.net[98.138.112.38] said: 421 4.7.0 [TS01] Messages from x.x.x.250 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html (in reply to MAIL FROM command) Jun 6 09:48:32 mailer postfix/smtp[8644]: C779A233C0: lost connection with mta6.am0.yahoodns.net[98.138.112.38] while sending RCPT TO Jun 6 09:48:33 mailer postfix/smtp[8644]: C779A233C0: to=<[email protected]>, relay=mta7.am0.yahoodns.net[98.138.112.35]:25, delay=37176, delays=36519/655/2.5/0.18, dsn=4.7.0, status=deferred (host mta7.am0.yahoodns.net[98.138.112.35] said: 421 4.7.0 [TS01] Messages from x.x.x.250 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html (in reply to MAIL FROM command)) Jun 6 09:48:33 mailer postfix/smtp[8644]: C779A233C0: to=<[email protected]>, relay=mta7.am0.yahoodns.net[98.138.112.35]:25, delay=37176, delays=36519/655/2.5/0.18, dsn=4.7.0, status=deferred (host mta7.am0.yahoodns.net[98.138.112.35] said: 421 4.7.0 [TS01] Messages from x.x.x.250 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html (in reply to MAIL FROM command)) Jun 6 09:48:34 mailer postfix/smtp[8644]: C779A233C0: to=<[email protected]>, relay=mta7.am0.yahoodns.net[98.138.112.35]:25, delay=37176, delays=36519/655/2.5/0.18, dsn=4.7.0, status=deferred (host mta7.am0.yahoodns.net[98.138.112.35] said: 421 4.7.0 [TS01] Messages from x.x.x.250 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html (in reply to MAIL FROM command)) Jun 6 09:48:34 mailer postfix/smtp[8644]: C779A233C0: to=<[email protected]>, relay=mta7.am0.yahoodns.net[98.138.112.35]:25, delay=37176, delays=36519/655/2.5/0.18, dsn=4.7.0, status=deferred (host mta7.am0.yahoodns.net[98.138.112.35] said: 421 4.7.0 [TS01] Messages from x.x.x.250 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html (in reply to MAIL FROM command)) Jun 6 09:48:34 mailer postfix/smtp[8644]: C779A233C0: to=<[email protected]>, relay=mta7.am0.yahoodns.net[98.138.112.35]:25, delay=37176, delays=36519/655/2.5/0.18, dsn=4.7.0, status=deferred (host mta7.am0.yahoodns.net[98.138.112.35] said: 421 4.7.0 [TS01] Messages from x.x.x.250 temporarily deferred due to user complaints - 4.16.55.1; see http://postmaster.yahoo.com/421-ts01.html (in reply to MAIL FROM command)) Jun 6 09:48:34 mailer postfix/error[8661]: C779A233C0: to=<[email protected]>, relay=none, delay=37177, delays=36519/658/0/0.07, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.138.112.35] while sending RCPT TO) Jun 6 09:48:34 mailer postfix/error[8661]: C779A233C0: to=<[email protected]>, relay=none, delay=37177, delays=36519/658/0/0.18, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.138.112.35] while sending RCPT TO) Jun 6 09:48:34 mailer postfix/error[8661]: C779A233C0: to=<[email protected]>, relay=none, delay=37177, delays=36519/658/0/0.35, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.138.112.35] while sending RCPT TO) Jun 6 09:48:34 mailer postfix/error[8661]: C779A233C0: to=<[email protected]>, relay=none, delay=37177, delays=36519/658/0/0.4, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.138.112.35] while sending RCPT TO) Jun 6 09:48:34 mailer postfix/error[8661]: C779A233C0: to=<[email protected]>, relay=none, delay=37177, delays=36519/658/0/0.46, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.138.112.35] while sending RCPT TO) Jun 6 09:48:35 mailer postfix/error[8661]: C779A233C0: to=<[email protected]>, relay=none, delay=37179, delays=36519/660/0/0.16, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.138.112.35] while sending RCPT TO) Jun 6 09:48:35 mailer postfix/error[8661]: C779A233C0: to=<[email protected]>, relay=none, delay=37179, delays=36519/660/0/0.22, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.138.112.35] while sending RCPT TO) Jun 6 09:48:36 mailer postfix/error[8661]: C779A233C0: to=<[email protected]>, relay=none, delay=37179, delays=36519/660/0/0.31, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.138.112.35] while sending RCPT TO) Jun 6 09:48:36 mailer postfix/error[8661]: C779A233C0: to=<[email protected]>, relay=none, delay=37179, delays=36519/660/0/0.36, dsn=4.4.2, status=deferred (delivery temporarily suspended: lost connection with mta7.am0.yahoodns.net[98.138.112.35] while sending RCPT TO)

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• Google Web Toolkit Deferred Binding Issue

  - by snctln

  I developed a web app using GWT about 2 years ago, since then the application has evolved. In its current state it relies on fetching a single XML file and parsing the information from it. Overall this works great. A requirement of this app is that it needs to be able to be ran from the filesystem (file:///..) as well as the traditional model of running from a webserver (http://...) Fetching this file from a webserver works exactly as expected using a RequestBuilder object. When running the app from the filesystem Firefox, Opera, Safari, and Chrome all behave as expected. When running the app from the filesystem using IE7 or IE8 the RequestBuilder.send() call fails, the information about the error suggests that there is a problem accessing the file due to violating the same origin policy. The app worked as expected in IE6 but not in IE7 or IE8. So I looked at the source code of RequestBuilder.java and saw that the actual request was being executed with an XMLHttpRequest GWT object. So I looked at the source code for XMLHttpRequest.java and found out some information. Here is the code (starts at line 83 in XMLHttpRequest.java) public static native XMLHttpRequest create() /*-{ if ($wnd.XMLHttpRequest) { return new XMLHttpRequest(); } else { try { return new ActiveXObject('MSXML2.XMLHTTP.3.0'); } catch (e) { return new ActiveXObject("Microsoft.XMLHTTP"); } } }-*/; So basically if an XMLHttpRequest cannot be created (like in IE6 because it is not available) an ActiveXObject is used instead. I read up a little bit more on the IE implementation of XMLHttpRequest, and it appears that it is only supported for interacting with files on a webserver. I found a setting in IE8 (Tools-Internet Options-Advanced-Security-Enable native XMLHTTP support), when I uncheck this box my app works. I assume this is because I am more of less telling IE to not use their implementation of XmlHttpRequest, so GWT just uses an ActiveXObject because it doesn't think the native XmlHttpRequest is available. This fixes the problem, but is hardly a long term solution. I can currently catch a failed send request and verify that it was trying to fetch the XML file from the filesystem using normal GWT. What I would like to do in this case is catch the IE7 and IE8 case and have them use a ActiveXObject instead of a native XmlHttpRequest object. There was a posting on the GWT google group that had a supposed solution for this problem (link). Looking at it I can tell that it was created for an older version of GWT. I am using the latest release and think that this is more or less what I would like to do (use GWT deferred binding to detect a specific browser type and run my own implementation of XMLHttpRequest.java in place of the built in GWT implementation). Here is the code that I am trying to use package com.mycompany.myapp.client; import com.google.gwt.xhr.client.XMLHttpRequest; public class XMLHttpRequestIE7or8 extends XMLHttpRequest { // commented out the "override" so that eclipse and the ant build script don't throw errors //@Override public static native XMLHttpRequest create() /*-{ try { return new ActiveXObject('MSXML2.XMLHTTP.3.0'); } catch (e) { return new ActiveXObject("Microsoft.XMLHTTP"); } }-*/; // have an empty protected constructor so the ant build script doesn't throw errors // the actual XMLHttpRequest constructor is empty as well so this shouldn't cause any problems protected XMLHttpRequestIE7or8() { } }; And here are the lines that I added to my module xml <replace-with class="com.mycompany.myapp.client.XMLHttpRequestIE7or8"> <when-type-is class="com.google.gwt.xhr.client.XMLHttpRequest"/> <any> <when-property-is name="user.agent" value="ie7" /> <when-property-is name="user.agent" value="ie8" /> </any> </replace-with> From what I can tell this should work, but my code never runs. Does anyone have any idea of what I am doing wrong? Should I not do this via deferred binding and just use native javascript when I catch the fail case instead? Is there a different way of approaching this problem that I have not mentioned? All replies are welcome.

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• Use depth bias for shadows in deferred shading

  - by cubrman

  We are building a deferred shading engine and we have a problem with shadows. To add shadows we use two maps: the first one stores the depth of the scene captured by the player's camera and the second one stores the depth of the scene captured by the light's camera. We then ran a shader that analyzes the two maps and outputs the third one with the ready shadow areas for the current frame. The problem we face is a classic one: Self-Shadowing: A standard way to solve this is to use the slope-scale depth bias and depth offsets, however as we are doing things in a deferred way we cannot employ this algorithm. Any attempts to set depth bias when capturing light's view depth produced no or unsatisfying results. So here is my question: MSDN article has a convoluted explanation of the slope-scale: bias = (m × SlopeScaleDepthBias) + DepthBias Where m is the maximum depth slope of the triangle being rendered, defined as: m = max( abs(delta z / delta x), abs(delta z / delta y) ) Could you explain how I can implement this algorithm manually in a shader? Maybe there are better ways to fix this problem for deferred shadows?

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• Deferred Open Source licensing

  - by Thomas W.

  Are there established models for releasing an initially proprietary piece of software under FLOSS conditions after a defined period or a certain point of time? The main problem here is that all parties involved must be able to trust that the Open Source licensing will actually take place at the defined time and no party can further defer or cancel this process. Clearly such a model has its problems, for example it's problematic to deal with contributions from "outside", legally and technically. Ghostscript is a prominent example where a deferred model has been used and abandoned. However, if certain parties involved will insist on keeping the software proprietary, at least for a certain period of time, then the only options are a deferred Open Source licensing model or no Open Source licensing at all. I think I read about services that serve as trusted parties who take care of Open Sourcing the software. However, I was not successful in spotting any of those.

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• What are deferred callbacks?

  - by tentimes

  I understand the idea of a callback, where I pass a function into another function and that function then uses the supplied function at will. I am struggling to understand deferred callbacks, even after googling it. Could someone provide a simple explanation please? I program in Ruby, but also know C/C++ a bit, but most of all I was a experienced assembly language programmer. So I am wondering is it a bit like a stack of callback addresses that get pop'd? I am hoping to learn jquery or node.js and these deferred callbacks seem integral to both. I understand basic threading principles (though mutex object makes my head hurt ;)

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• How do I reconstruct depth in deferred rendering using an orthographic projection?

  - by Jeremie

  I've been trying to get my world space position of my pixel but I4m missing something. I'm using a orthographic view for a 2.5d game. My depth is linear and this is my code. float3 lightPos = lightPosition; float2 texCoord = PostProjToScreen(PSIn.lightPosition)+halfPixel; float depth = tex2D(depthMap, texCoord); float4 position; position.x = texCoord.x *2-1; position.y = (1-texCoord.y)*2-1; position.z = depth.r; position.w = 1; position = mul(position, inViewProjection); //position.xyz/=position.w; // I comment it but even without it it doesn't work float4 normal = (tex2D(normalMap, texCoord)-.5f) * 2; normal = normalize(normal); float3 lightDirection = normalize(lightPos-position); float att = saturate(1.0f - length(lightDirection) /attenuation); float lightning = saturate (dot(normal, lightDirection)); lightning*= brightness; return float4(lightColor* lightning*att, 1); I'm using a sphere but it's not working the way I want. I reproject the texture properly onto the sphere but the light coordinates in the pixel shader seems to be stuck at zero even if when I move the light volume update properly.

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• Prevent deferred creation of controls.

  - by Scott Chamberlain

  Here is a test framework to show what I am doing, just create a new project add a tabbed control, on tab 1 put a button on tab 2 put a check box (default names) and paste this code for its code public partial class Form1 : Form { private List<bool> boolList = new List<bool>(); BindingSource bs = new BindingSource(); public Form1() { InitializeComponent(); boolList.Add(false); bs.DataSource = boolList; checkBox1.DataBindings.Add("Checked", bs, ""); } bool updating = false; private void button1_Click(object sender, EventArgs e) { updating = true; boolList[0] = true; bs.ResetBindings(false); Application.DoEvents(); updating = false; } private void checkBox1_CheckedChanged(object sender, EventArgs e) { if (!updating) MessageBox.Show("CheckChanged fired outside of updating"); } } The issue is if you run the program and look at tab 2 then press the button on tab 1 the program works as expected, however if you press the button on tab 1 then look at tab 2 the event for the checkbox will not fire untill you look at tab 2. The reason for this is the controll on tab 2 is not in the "created" state, so its binding to change the checkbox from unchecked to checked does not happen until after the control has been "Created". checkbox1.CreateControl() does not do anything because according to MSDN CreateControl does not create a control handle if the control's Visible property is false. You can either call the CreateHandle method or access the Handle property to create the control's handle regardless of the control's visibility, but in this case, no window handles are created for the control's children. I tried getting the value of Handle(there is no CreateHandle for Button) but still the same result. Any suggestions other than have the program quickly flash all of my tabs that have data-bound check boxes when it first loads?

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• Ajax Post Request Returns JSON but Deferred Fails

  - by imrane

  I have a cross-domain POST request to http://api.local/user/auth - my API endpoint. I allow Cross Domain requests in my api with CORS. Using Chrome if that makes a difference. I get a valid server JSON response with 200 Status Code but I am using deferreds from a backbone model like so: @model.save() .fail(-> console.log 'sync fail') .success -> console.log 'sync OK' And I consistently get a 'sync fail' instead of the expected 'sync OK' Thoughts?

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• Deferred execution and eager evaluation

  - by babu M

  Hi Could you please give me an example for Deferred execution with eager evaluation in C#? I read from MSDN that deferred execution in LINQ can be implemented either with lazy or eager evaluation...i could find examples in the internet for Deferred execution with lazy evaluation ,however i could not find any example for Deferred execution with eager evaluation....please help me....its urgent... Moreover,how deferred execution differs from lazy evaluation?In my point of view,both are looking same.Could you please provide any example for this too?

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• Scene Graph for Deferred Rendering Engine

  - by Roy T.

  As a learning exercise I've written a deferred rendering engine. Now I'd like to add a scene graph to this engine but I'm a bit puzzled how to do this. On a normal (forward rendering engine) I would just add all items (All implementing IDrawable and IUpdateAble) to my scene graph, than travel the scene-graph breadth first and call Draw() everywhere. However in a deferred rendering engine I have to separate draw calls. First I have to draw the geometry, then the shadow casters and then the lights (all to different render targets), before I combine them all. So in this case I can't just travel over the scene graph and just call draw. The way I see it I either have to travel over the entire scene graph 3 times, checking what kind of object it is that has to be drawn, or I have to create 3 separate scene graphs that are somehow connected to each other. Both of these seem poor solutions, I'd like to handle scene objects more transparent. One other solution I've thought of was traveling trough the scene graph as normal and adding items to 3 separate lists, separating geometry, shadow casters and lights, and then iterating these lists to draw the correct stuff, is this better, and is it wise to repopulate 3 lists every frame?

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• RSA encryption results in server execution timeout

  - by Nilambari

  Hi, I am using PHP Crypt_RSA (http://pear.php.net/package/Crypt_RSA) for encrypting and decrypting the contents. Contents are of 1kb size. Following are the results: keylength = 1024 Encryption function takes time: 225 secs keylength = 2048 Encryption function takes time: 115 secs I need to reduce this execution time as most of the live apache servers have 120 sec limit for execution time. How to reduce this execution time? RSA alorithm docs says the only 1024 - 2048 keys are generated. I ACTUALLY tried to generate larger key, but it always results in execution timeout. How do i work on reducing encryption - decryption execution time? Thanks, Nila

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• Deferred Shading - Toolkit

  - by AliveDevil

  I recently managed to get some lights rendered in a scene by using a buffer and a for-loop. The problem with this method is the performance drop if more lights are used. I tried to convert Deferred Rendering in XNA4.0 | ROY-T.NL but it is not working, because I am not using any models. I know I have to render color, normals and lights seperate but I don't know how I could get it working. For understanding my structure better I'm using a world-class which holds some chunks. These chunks are loading all vertices from their items. These items have a property which returns the vertices. The item is returning VertexPositionNormalTexture[]. The chunk loads these Vertices and combines them to one large array of VertexPositionNormalTexture via someList.AsParallel().SelectMany(m => m).ToArray()). m is a VertexPositionNormalTexture. someList is List<VertexPositionNormalTexture>. I got my own shader to draw these vertices how I want them to be drawn. The first thing I would try is setting up two RenderTarget2D for rendering the color and normal part. With two different shaders. Than I would have to render the lights and there's the problem: I don't know how. I set up a structure to simplify working with lights but it didn't really help. public struct Light { public Vector3 Position; public Color4 Color; public float Range; public float Intensity; public Light( Vector3 position, Color color, float range, float intensity ) : this() { this.Position = position; this.Color = color; this.Range = range; this.Intensity = intensity; } public float[] Definition { get { return new[] { Position.X, Position.Y, Position.Z, Color.Red, Color.Green, Color.Blue, Intensity, Range }; } } } The next part is equally different because I don't know how to combine the colorMap, normalMap and textureMap to one finalMap. Some information to the system: I'm using SharpDX (Nightly from some months ago) and the SharpDX.Toolkit (I don't want to mess up with Direct3DDevice and similar things). Can someone help me with this problem? If things are missing or I provided insufficient information tell me, I need to get deferred shading working. Things I'm not able to do: create a rendertarget which holds all lights, merge colorMap, normalMap and lightMap to one finalMap and presenting this to the user.

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• What should I name instances of a twisted.internet.defer.Deferred?

  - by slacy

  I'm writing code using Twisted, and having trouble coming up with a sensible variable name for my twisted internet deferred's. Here are my candidates: d : Too generic, too short, violates pylint rule C0103. def : Conflicts with function defintion builtin. defer : Conflicts with module twisted.internet.defer deferred : OK but pretty long cb : Still too short, violates pylint C0103, conflicts with many callback method names. cback : Too Weird? callback : Conflicts with method Deferred.callback() I'm looking for other suggestions. It seems like most of the Twisted example code uses "d" which is fine for simple invocations, but when you're passing Deferred's around to methods and storing them as member variables, it's really far too descriptive.

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• To find an execution line-counter for Java IDE

  - by Masi

  Is there any plugin to some IDE that show the number of times a line is run in the code? Eclipse's ECLemma does not seem to have a setting to show execution times at the left-hand-side bar, like in the service WebCat.

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• Code coverage (c++ code execution path)

  - by Poni

  Let's say I have this code: int function(bool b) { // execution path 1 int ret = 0; if(b) { // execution path 2 ret = 55; } else { // execution path 3 ret = 120; } return ret; } I need some sort of a mechanism to make sure that the code has gone in any possible path, i.e execution paths 1, 2 & 3 in the code above. I thought about having a global function, vector and a macro. This macro would simply call that function, passing as parameters the source file name and the line of code, and that function would mark that as "checked", by inserting to the vector the info that the macro passed. The problem is that I will not see anything about paths that did not "check". Any idea how do I do this? How to "register" a line of code at compile-time, so in run-time I can see that it didn't "check" yet? I hope I'm clear.

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• how to set timer for calculate execution time

  - by ratty

  i like to set timer for calculating execution time in c# for particular process in my execution. how can i do this

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• Deferred rendering with both Clockwise and CounterClockwise culling

  - by user1423893

  I have a deferred rendering system that works well with objects that appear solid and drawn using CounterClockwise culling. I have a problem with Clockwise culled objects that are supposed to represent hollow that display their inside faces only. The image below shows a CounterClockwise culled object (left) Clockwise culled object (right). The Clockwise culled object faces display what would be displayed on the CounterClockwise face. How can I get the lighting to light the inner faces for Clockwise culled objects and continue lighting the outer CounterClockwise faces as normal? My lighting method is below private void DeferredLighting(GameTime gameTime) { // Set the render target for the lights game.GraphicsDevice.SetRenderTarget(lightMap); // Clear the render target to (0, 0, 0, 0) game.GraphicsDevice.Clear(Color.Transparent); // Set the render states game.GraphicsDevice.BlendState = BlendState.Additive; game.GraphicsDevice.DepthStencilState = DepthStencilState.None; game.GraphicsDevice.RasterizerState = RasterizerState.CullCounterClockwise; // Set sampler state to Point as the Surface type requires it in XNA 4.0 game.GraphicsDevice.SamplerStates[0] = SamplerState.PointClamp; // Set the camera properties for all lights BaseLight.SetCameraProperties(game.ActiveCamera); // Draw the lights int numLights = lights.Count; for (int i = 0; i < numLights; ++i) { if (lights[i].Diffuse.W > 0f) { lights[i].Render(gameTime, ref normalMap, ref depthMap, ref sgrMap); } } // Resolve the render target game.GraphicsDevice.SetRenderTarget(null); } I have tried adjusting the render states but no combination works for both objects.

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• Twisted: why is it that passing a deferred callback to a deferred thread makes the thread blocking a

  - by surtyaarthoughts

  I unsuccessfully tried using txredis (the non blocking twisted api for redis) for a persisting message queue I'm trying to set up with a scrapy project I am working on. I found that although the client was not blocking, it became much slower than it could have been because what should have been one event in the reactor loop was split up into thousands of steps. So instead, I tried making use of redis-py (the regular blocking twisted api) and wrapping the call in a deferred thread. It works great, however I want to perform an inner deferred when I make a call to redis as I would like to set up connection pooling in attempts to speed things up further. Below is my interpretation of some sample code taken from the twisted docs for a deferred thread to illustrate my use case: #!/usr/bin/env python from twisted.internet import reactor,threads from twisted.internet.task import LoopingCall import time def main_loop(): print 'doing stuff in main loop.. do not block me!' def aBlockingRedisCall(): print 'doing lookup... this may take a while' time.sleep(10) return 'results from redis' def result(res): print res def main(): lc = LoopingCall(main_loop) lc.start(2) d = threads.deferToThread(aBlockingRedisCall) d.addCallback(result) reactor.run() if __name__=='__main__': main() And here is my alteration for connection pooling that makes the code in the deferred thread blocking : #!/usr/bin/env python from twisted.internet import reactor,defer from twisted.internet.task import LoopingCall import time def main_loop(): print 'doing stuff in main loop.. do not block me!' def aBlockingRedisCall(x): if x<5: #all connections are busy, try later print '%s is less than 5, get a redis client later' % x x+=1 d = defer.Deferred() d.addCallback(aBlockingRedisCall) reactor.callLater(1.0,d.callback,x) return d else: print 'got a redis client; doing lookup.. this may take a while' time.sleep(10) # this is now blocking.. any ideas? d = defer.Deferred() d.addCallback(gotFinalResult) d.callback(x) return d def gotFinalResult(x): return 'final result is %s' % x def result(res): print res def aBlockingMethod(): print 'going to sleep...' time.sleep(10) print 'woke up' def main(): lc = LoopingCall(main_loop) lc.start(2) d = defer.Deferred() d.addCallback(aBlockingRedisCall) d.addCallback(result) reactor.callInThread(d.callback, 1) reactor.run() if __name__=='__main__': main() So my question is, does anyone know why my alteration causes the deferred thread to be blocking and/or can anyone suggest a better solution?

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• convincing C# compiler that execution will stop after a member returns

  - by Sarah Vessels

  I don't think this is currently possible or if it's even a good idea, but it's something I was thinking about just now. I use MSTest for unit testing my C# project. In one of my tests, I do the following: MyClass instance; try { instance = getValue(); } catch (MyException ex) { Assert.Fail("Caught MyException"); } instance.doStuff(); // Use of unassigned local variable 'instance' To make this code compile, I have to assign a value to instance either at its declaration or in the catch block. However, Assert.Fail will never, to the best of my knowledge, allow execution to proceed past it, hence instance will never be used without a value. Why is it then that I must assign a value to it? If I change the Assert.Fail to something like throw ex, the code compiles fine, I assume because it knows that exception will disallow execution to proceed to a point where instance would be used uninitialized. So is it a case of runtime versus compile-time knowledge about where execution will be allowed to proceed? Would it ever be reasonable for C# to have some way of saying that a member, in this case Assert.Fail, will never allow execution after it returns? Maybe that could be in the form of a method attribute. Would this be useful or an unnecessary complexity for the compiler?

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• postfix smtp_fallback_relay for deferred messages to a single domain

  - by EdwardTeach

  I use Postfix to send messages to a mail server outside my organization which frequently rejects/defers my mail. My Postfix server sees that these messages are deferred and tries again, eventually getting through. Final delivery can take up to an hour, which makes my users unhappy. In comparison, mail from my Postfix server to other hosts works normally. I have now found out about a second, unofficial MX for this domain that does not reject/defer mail. This second MX does not appear when doing a DNS MX query for the domain. Therefore, for the problem domain I would like to use this second MX as a fallback. That is: whenever mail is deferred by the primary MX, try again on the unofficial second MX. I see that there is already a postfix configuration "smtp_fallback_relay". However the documentation seems to indicate that I can not restrict usage of the fallback to a single domain. The documentation also doesn't mention deferred message handling. So is there a way to configure a single-domain, deferred-retry fallback host in Postfix? For reference, I am including my postconf output (the host names and ip addresses are fake): alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases, hash:/etc/postfix/legacy_mailman, ldap:/etc/postfix/ldap-aliases.cf append_dot_mydomain = no biff = no config_directory = /etc/postfix default_destination_concurrency_limit = 2 inet_interfaces = all inet_protocols = all local_destination_concurrency_limit = 2 local_recipient_maps = $alias_maps mailbox_size_limit = 0 mydestination = myhost.my.network, localhost.my.network, localhost, my.network myhostname = myhost.my.network mynetworks = 127.0.0.0/8, [::ffff:127.0.0.0]/104, [::1]/128, 10.10.10.0/24 myorigin = my.network readme_directory = no recipient_delimiter = + relay_domains = $mydestination relayhost = smtp_fallback_relay = the.problem.host smtp_header_checks = smtpd_banner = $myhostname ESMTP $mail_name virtual_alias_maps = hash:/etc/postfix/virtual

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• PLINQ delayed execution

  - by tbischel

  I'm trying to understand how parallelism might work using PLINQ, given delayed execution. Here is a simple example. string[] words = { "believe", "receipt", "relief", "field" }; bool result = words.AsParallel().Any(w => w.Contains("ei")); With LINQ, I would expect the execution to reach the "receipt" value and return true, without executing the query for rest of the values. If we do this in parallel, the evaluation of "relief" may have began before the result of "receipt" has returned. But once the query knows that "receipt" will cause a true result, will the other threads yield immediately? In my case, this is important because the "any" test may be very expensive, and I would want to free up the processors for execution of other tasks.

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• Limit a program's execution time in C (Monte Carlo technique)

  - by rrs90

  I am working on a project which has no determined algorithm to solve using C language. I am Using Monte Carlo technique for solving that problem. And the number of random guesses I want to limit to the execution time specified by the user. This means I want to make full use of the execution time limit defined by the user (as a command line argument) to make as many random iterations as possible. Can I check the execution time elapsed so far for a loop condition. Eg: for(trials=0;execution_time P.S. I am using code blocks 10.05 for coding and GNU compiler.

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• Different execution plan for similar queries

  - by Graham Clements

  I am running two very similar update queries but for a reason unknown to me they are using completely different execution plans. Normally this wouldn't be a problem but they are both updating exactly the same amount of rows but one is using an execution plan that is far inferior to the other, 4 secs vs 2 mins, when scaled up this is causing me a massive problem. The only difference between the two queries is one is using the column CLI and the other DLI. These columns are exactly the same datatype, and are both indexed exactly the same, but for the DLI query execution plan, the index is not used. Any help as to why this is happening is much appreciated. -- Query 1 UPDATE a SET DestKey = ( SELECT TOP 1 b.PrefixKey FROM refPrefixDetail AS b WHERE a.DLI LIKE b.Prefix + '%' ORDER BY len(b.Prefix) DESC ) FROM CallData AS a -- Query 2 UPDATE a SET DestKey = ( SELECT TOP 1 b.PrefixKey FROM refPrefixDetail b WHERE a.CLI LIKE b.Prefix + '%' ORDER BY len(b.Prefix) DESC ) FROM CallData AS a

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• Remote execution in a domain environment

  - by T. Crancker

  I have a windows domain environment and it contains only Server 2008 Os's. I'm trying to execute a script or a program from 1 server on multiple servers, but I can't configure or install any applications. I was trying to user powershell v2.0 (invoke-command) but its not configured and I cant configure it. I'm looking for an alternative maybe WMI. Psexec and rcmd are not installed on any servers. Any advise could help a lot.

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