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• Free training at Northwest Cadence

  - by Martin Hinshelwood

  Even though I have only been at Northwest Cadence for a short time I have already done so much. What I really wanted to do was let you guys know about a bunch of FREE training that NWC offers. These sessions are at a fantastic time for the UK as 9am PST (Seattle time) is around 5pm GMT. Its a fantastic way to finish off your Fridays and with the lack of love for developers in the UK set to continue I would love some of you guys to get some from the US instead. There are really two offerings. The first is something called Coffee talks that take you through an hours worth of detail in a specific category. Coffee Talks These coffee talks have some superb topics and you can get excellent interaction with the presenter as they are kind of informal. Date Day Time Topic Register Here 01/04/11 Tuesday 8:30AM – 9:30AM PST Real World Business and Technical Benefits of ALM with TFS 2010 150656 01/28/11 Friday 9:00AM - 10:00AM PST The Full Testing Experience Professional Quality Assurance with Visual Studio 2010 152810 02/11/11 Friday 9:00AM - 10:00AM PST Visual Source Safe to Team Foundation Server 152844 02/25/11 Friday 2:00PM - 3:00PM PST The Full Testing Experience Professional Quality Assurance with Visual Studio 2010 152816 03/11/11 Friday 9:00AM - 10:00AM PST Lab Manager The Ultimate “No More No Repro” Tool 152809 03/25/11 Friday 9:00AM - 10:00AM PST The Full Testing Experience Professional Quality Assurance with Visual Studio 2010 152838 04/08/11 Friday 9:00AM - 10:00AM PST Visual Source Safe to Team Foundation Server 152846 04/22/11 Friday 9:00AM - 10:00AM PST The Full Testing Experience Professional Quality Assurance with Visual Studio 2010 152839 05/06/11 Friday 2:00PM - 3:00PM PST Real World Business and Technical Benefits of ALM with TFS 2010 150657 05/20/11 Friday 9:00AM - 10:00AM PST The Full Testing Experience Professional Quality Assurance with Visual Studio 2010 152842 06/03/11 Friday 9:00AM - 10:00AM PST Visual Source Safe to Team Foundation Server 152847 06/17/11 Friday 9:00AM - 10:00AM PST The Full Testing Experience Professional Quality Assurance with Visual Studio 2010 152843   ALM Training Engagement Program Microsoft has released a new program to bring free Visual Studio 2010 Training Sessions to select customers on Microsoft Visual Studio products and how Application Lifecycle Management (ALM) solutions can help drive greater business impact. For more details on this program, please see the process chart below.  To get started send an email to us; This training is paid for by Microsoft and you would need to commit to 4 sessions in order to get accepted into the program. So these have more hoops to jump through to get them, but the content is much more formal and centres around adoption.

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• how to assign web server and domain a public ip adress

  - by kdavis8

  i have installed an ISO image of windows server 2008 r2 onto my VMware workstation, as a virtual server. I am trying to host my own web server for testing purposes.I have Internet service with sprint and i called them to obtain my public ip address. Now that i have my public ip address how to i assign it to my server? I also have a web domain name that i would like to point it at that web server. Do i give it the public ip address or do i give it the name of the server?

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• Announcement Oracle Solaris 11.1 Availability!

  - by uwes

  On 25th of October Oracle announced the availability of Oracle Solaris 11.1. Highlights include: 8x faster database startup and shutdown and online resizing of the database SGA with a new optimized shared memory interface between the database and Oracle Solaris 11.1 Up to 20% throughput increases for Oracle Real Application Clusters by offloading lock management into the Oracle Solaris kernel Expanded support for Software Defined Networks (SDN) with Edge Virtual Bridging enhancements to maximize network resource utilization and manage bandwidth in cloud environments 4x faster Solaris Zone updates with parallel operations shorten maintenance windows New built-in memory predictor monitors application memory use and provides optimized memory page sizes and resource location to speed overall application performance. More information could be found under the following links: Oracle Solaris 11.1 Data Sheet  What's New in Oracle Solaris 11.1 Oracle Solaris 11.1 FAQs Oracle.com Oracle Solaris page Oracle Technology Network Oracle Solaris page Resources for downloading: Download Solaris 11.1 Order Solaris 11.1 media kit Existing customers can quickly and simply update using the network based repository

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• E-Business Suite, ADF, Mobile and Eclipse: Oracle OpenWorld is Here!

  - by Juan Camilo Ruiz

  Oracle OpenWorld 2012 is around the corner! Lots of exciting news and content awaits for all attendees next week - the theme of my participation: ADF and E-Business Suite integration, together with ADF development in Oracle Enterprise Eclipse Package and JDeveloper.If you are coming to San Francisco and are a reader of this blog, you might be wondering what I'll be doing next week and also what should you attend? So, the following is the list of activities where I'll be participating or that I recommend you should not miss:First and foremost: On Thursday Oct. 4: Using Oracle ADF with Oracle E-Business Suite: The Full Integration View.  11.15 a.m - Moscone West 3003:  This is an emerging hot topic among both ADF and Oracle E-Business Suite Customers. In this session I'll be doing a presentation with Sara Woodhull from the Applications Technology Group (ATG) in Oracle E-Business Suite and Siva Puthurkattil from Lake County, Illinois. Sunday, Sept. 30:  I'll be hanging out at the ADF EMG User Day, learning directly from our users and Gurus. Monday, Oct. 1: Don't miss Chris Tonas's keynote for developers - at 10:45 am. Salon 8 at the Marriot - The Future of Development for Oracle Fusion—From Desktop to Mobile to Cloud. Then: At 12.15 p.m. Moscone West 3014 - Extend Oracle Fusion Apps to Tablets/Smartphones with Oracle Mobile Technology Followed by: At 1.45 p.m. Moscone West 3002/3004 -  Extend Oracle Applications to Mobile Devices with Oracle’s Mobile Technologies I'll be participating in a couple of Hands-On Labs: Build Mobile Applications for Oracle E-Business Suite 1:45 PM- Marriott Marquis - Salon 10A And: Introduction to ADF 3.15 p.m - Marrriott Marquis - Salon 3/4. Tuesday, Oct. 2: I'll be at the Oracle Enterprise Pack for Eclipse demo booth showing some nice demos on ADF development with Eclipse. Wednesday, Oct. 3: Mobile Apps for Oracle E-Business Suite with Oracle ADF Mobile and Oracle SOA Suite 10:15 AM - Moscone West - 3001. Let's have a beer at the Oracle ADF Developer Meetup. OTN Louge 4:30 p.,m - 5.30 p.m! Thursday, Oct. 4: After my session, come to experience ADF development in Eclipse at the Oracle ADF for Java EE Developers with Oracle Enterprise Pack for Eclipse HandsOn Lab 12.45 p,m - Marriot room 3/4. All the Oracle OpenWorld related sessions can be found here: ADF - http://goo.gl/eJFNi Mobile: http://goo.gl/mGoRM E-Business Suite: http://goo.gl/5NqMd

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• extrapolating object state based on updates

  - by user494461

  I have a networked multi-user collaborative application. To maintain a consistent virtual world, I send updates for objects from a master peer to a guest peer. The update state contains x,y,z coordinates of object center and his rotation matrix(CHAI3d api used a 3x3 matrix) with 30Hz frequency. I want to reduce this update rate and want to send with a reduced update rate. I want a predictor on both peers. When the predicted value is outside, say a error value of 10% in comparison to master peers objects original state the master peer triggers a state update. Now for position I used velocity,position updates so that the guest peer can extrapolate position. Like velocity for position what parameter should I use for rotation extrapolition?

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• VMWare Kernel Modules will not compile or update on Ubuntu 12.04

  - by IsaacS

  Kernel Module Update was required when opening VMWare client (vmplayer) then following error occurs. Any idea would be appreciated. Unable to start services. See log file /tmp/vmware-root/setup-NNN.log for details (Note: NNN looks like random numbers) On GUI that show progress of updating, "Virtual Netowork Device" show red flag appears. Content of .log file is here: http://pastebin.com/wEKT5UHf This page suggests installing linux-headers-generic and build-essential, which are already installed on mine (thus no good). This could be 1st execution of vmplayer on my machine since I upgraded to Ubuntu 12.04 from 11.10. Environment: VMware Player 4.0.3 build-703057

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• The Spotlight is on You

  - by Claudia McDonald

  On the field or off the field, in ballet slippers or singing your heart out on stage, offering a stellar performance every time is key to holding the attention of your audience and having them come back hungry for more. Similarly, showing up to a new business meeting wearing pink tights and a tutu might be one way to holding the attention of your customer, but offering them an unmatched and ground-breaking software solution certainly will get their attention! Simply put, the Oracle Exastack program enables both ISV's and OEM's to rapidly build and deliver faster, more reliable applications. It comes as no surprise that the success of the Oracle Exastack program is centered on establishing Oracle Exadata Database Machine and Oracle Exalogic Elastic Cloud as the highest performance, lowest cost platforms available in the industry today.  But here is where the real standing-ovation-worthy facts come in. The Oracle Exadata Database Machine is the only database machine that provides extreme performance for both data warehousing and online transaction processing (OLTP) workloads, making it the ideal platform for consolidating onto private clouds. Whereas the Oracle Exalogic Elastic Cloud is an engineered hardware and software system tested and tuned by Oracle to provide the best foundation for cloud computing, while allowing Java applications, Oracle Applications and other enterprise applications to run with extreme performance. – And the crowd goes wild, ladies and gentlemen! In just four months alone, our partners have already achieved over 150 Oracle Exastack Ready milestones for Oracle Solaris, Oracle Linux, Oracle Database and Oracle WebLogic Server.  As Judson has said, “With the Oracle Exastack program, Oracle is helping partners test, tune and optimize their applications to deliver optimal performance and reliability, accelerating innovation and delivering superior value to customers." And get this, not only are their applications running faster and more efficiently, they are actually being delivered at a lower cost to customers than ever before – extreme performance well deserving of 3 consecutive arabesques! If you haven’t already, check out what some of our partners are saying about the Oracle Exastack program in this video, and find out all that is available to you today. By participating in the Oracle Exastack program, partners now have the ability to achieve Oracle Exadata Optimized, Oracle Exalogic Optimized, Oracle Exadata Ready and Oracle Exalogic Ready status for their solutions. New Oracle Exastack labs, provide OPN members with access to Oracle technical resources, on-premise facilities and remote lab environments. With Oracle Exastack Optimized, partners experience faster and more reliable applications to run on the Oracle Exadata Database Machine, as well as the long awaited Oracle Exalogic Elastic Cloud. Savvy OPN members are leveraging the Oracle Exastack Optimized program toward their advancement to Platinum or Diamond level in OPN. Partners are achieving Oracle Exadata Ready and Oracle Exalogic Ready giving them a competitive advantage and signaling to customers that their applications readily support Oracle Exadata Database Machine or Oracle Exalogic Elastic Cloud to deliver extreme performance. Get your dancing shoes on, The OPN Communications Team

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• Does the LGPL allow me to do this?

  - by user1229892

  I am planning to develop a commercial software using a LGPL software. In the LGPL software that I am using some functions in a class are not fully implemented. I want to modify the LGPL code so that the class and not-implemented functions are made visible outside the dll by adding dllexport infront of class and by adding virtual keyword infront of function. Then I plan to implement those functions in my proprietary software. I am ready to distribute the modified LGPL code but not proprietary software that implements functions in the way I want. Does that violate LGPL terms and conditions?

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• Interview with Geoff Bones, developer on SQL Storage Compress

  - by red(at)work

  How did you come to be working at Red Gate? I've been working at Red Gate for nine months; before that I had been at a multinational engineering company. A number of my colleagues had left to work at Red Gate and spoke very highly of it, but I was happy in my role and thought, 'It can't be that great there, surely? They'll be back!' Then one day I visited to catch up them over lunch in the Red Gate canteen. I was so impressed with what I found there, that, three days later, I'd applied for a role as a developer. And how did you get into software development? My first job out of university was working as a systems programmer on IBM mainframes. This was quite a while ago: there was a lot of assembler and loading programs from tape drives and that kind of stuff. I learned a lot about how computers work, and this stood me in good stead when I moved over the development in the 90s. What's the best thing about working as a developer at Red Gate? Where should I start? One of the great things as a developer at Red Gate is the useful feedback and close contact we have with the people who use our products, either directly at trade shows and other events or through information coming through the product managers. The company's whole ethos is built around assisting the user, and this is in big contrast to my previous development roles. We aim to produce tools that people really want to use, that they enjoy using, and, as a developer, this is a great thing to aim for and a great feeling when we get it right. At Red Gate we also try to cut out the things that distract and stop us doing our jobs. As a developer, this means that I can focus on the code and the product I'm working on, knowing that others are doing a first-class job of making sure that the builds are running smoothly and that I'm getting great feedback from the testers. We keep our process light and effective, as we want to produce great software more than we want to produce great audit trails. Tell us a bit about the products you are currently working on. You mean HyperBac? First let me explain a bit about what HyperBac is. At heart it's a compression and encryption technology, but with a few added features that open up a wealth of really exciting possibilities. Right now we have the HyperBac technology in just three products: SQL HyperBac, SQL Virtual Restore and SQL Storage Compress, but we're only starting to develop what it can do. My personal favourite is SQL Virtual Restore; for example, I love the way you can use it to run independent test databases that are all backed by a single compressed backup. I don't think the market yet realises the kind of things you do once you are using these products. On the other hand, the benefits of SQL Storage Compress are straightforward: run your databases but use only 20% of the disk space. Databases are getting larger and larger, and, as they do, so does your ROI. What's a typical day for you? My days are pretty varied. We have our daily team stand-up meeting and then sometimes I will work alone on a current issue, or I'll be pair programming with one of my colleagues. From time to time we give half a day up to future planning with the team, when we look at the long and short term aims for the product and working out the development priorities. I also get to go to conferences and events, which is unusual for a development role and gives me the chance to meet and talk to our customers directly. Have you noticed anything different about developing tools for DBAs rather than other IT kinds of user? It seems to me that DBAs are quite independent minded; they know exactly what the problem they are facing is, and often have a solution in mind before they begin to look for what's on the market. This means that they're likely to cherry-pick tools from a range of vendors, picking the ones that are the best fit for them and that disrupt their environments the least. When I've met with DBAs, I've often been very impressed at their ability to summarise their set up, the issues, the obstacles they face when implementing a tool and their plans for their environment. It's easier to develop products for this audience as they give such a detailed overview of their needs, and I feel I understand their problems.

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• How to do more with Oracle VM Templates

  - by uwes

  On Oracle's Virtualization Blog you can find an interesting post regarding working and using Oracle VM Templates, title is "Opening The Oracle VM Templates Blackbox". Monica Kumar gives a brief explanation what Oracle VM Guest Additions are and how they can help to work smarter with Templates. At the end you will find a hint to join an up coming webcast (October 24th), where you can get more knowledge from experts like Robbie de Meyer or Saar Maoz. Register for the live Webcast. View the whitepaper on Oracle VM Templates Automated Virtual Machine Provisioning.

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• Implementing synchronous MediaTypeFormatters in ASP.NET Web API

  - by cibrax

  One of main characteristics of MediaTypeFormatter’s in ASP.NET Web API is that they leverage the Task Parallel Library (TPL) for reading or writing an model into an stream. When you derive your class from the base class MediaTypeFormatter, you have to either implement the WriteToStreamAsync or ReadFromStreamAsync methods for writing or reading a model from a stream respectively. These two methods return a Task, which internally does all the serialization work, as it is illustrated bellow. public abstract class MediaTypeFormatter { public virtual Task WriteToStreamAsync(Type type, object value, Stream writeStream, HttpContent content, TransportContext transportContext); public virtual Task<object> ReadFromStreamAsync(Type type, Stream readStream, HttpContent content, IFormatterLogger formatterLogger); }   .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } However, most of the times, serialization is a safe operation that can be done synchronously. In fact, many of the serializer classes you will find in the .NET framework only provide sync methods. So the question is, how you can transform that synchronous work into a Task ?. Creating a new task using the method Task.Factory.StartNew for doing all the serialization work would be probably the typical answer. That would work, as a new task is going to be scheduled. However, that might involve some unnecessary context switches, which are out of our control and might be affect performance on server code specially.   If you take a look at the source code of the MediaTypeFormatters shipped as part of the framework, you will notice that they actually using another pattern, which uses a TaskCompletionSource class. public Task WriteToStreamAsync(Type type, object value, Stream writeStream, HttpContent content, TransportContext transportContext) {   var tsc = new TaskCompletionSource<AsyncVoid>(); tsc.SetResult(default(AsyncVoid));   //Do all the serialization work here synchronously   return tsc.Task; }   /// <summary> /// Used as the T in a "conversion" of a Task into a Task{T} /// </summary> private struct AsyncVoid { } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } They are basically doing all the serialization work synchronously and using a TaskCompletionSource for returning a task already done. To conclude this post, this is another approach you might want to consider when using serializers that are not compatible with an async model. Update: Henrik Nielsen from the ASP.NET team pointed out the existence of a built-in media type formatter for writing sync formatters. BufferedMediaTypeFormatter http://t.co/FxOfeI5x

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• How to configure apache / php / postfix website emails when using vhosts?

  - by Alistair Buxton

  I have a LAMP webserver configured to serve multiple websites. Each virtual host has various PHP applications, mainly Wordpress. When users sign up to the Wordpress sites, email is sent by PHP through to postfix, and then on to the receiver. The problem is that postfix is identifying itself to the remote server with the contents of /etc/hostname, which is not a fully qualified domain name. Some mail servers reject this and the mail bounces. Additionally, the return path is being set to one of the vitual host domains, seemingly at random. I could set /etc/hostname to one of the website domain names, but then the emails from the other websites would have a wrong server in the headers, and this would not fix the return-path issue. Possibly related, apache2 says "could not determine the server's fully qualified domain name" on startup. How do I fix this so that each website can send email without revealing the other websites hosted on the server?

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• Webcast Replay: OVCA Launch Channel Update

  - by Claudia Caramelli-Oracle

  Last 28 May we held a webcast about Oracle Virtual Compute Appliance (OVCA) launch update for the channel. A brief product overview of OVCA has been followed by some great OPN program content, resell criteria, OPN Incentive Program and Demo Equipment Program details. You can download the slides HERE, but remember, you need to be a registered member of the community to be able to access the workspace. If you are not a member yet, you can register here. We look forward to welcoming you to another webcast soon!

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• How can I force X to start in a computer without a monitor?

  - by Javier Rivera

  I have I computer that have no monitor attached. When I boot it X fails to start because there is no monitor detected. If I boot it with a monitor attached and after X is started I remove the monitor everything works fine. Details and Background: This computer is a kind of hardware consolidation server. It's only purpose is to run two Virtual Box VM's that run Windows XP and some important but seldom used (once or twice a month) programs. For a couple of time it has been lying in a corner with an old monitor attached to it and working great. But space in the office was getting scarce and I moved the computer to the server room. There is no monitor attached to it there (no space), and sometimes the computer is rebooted. When it boots without monitor X is not started, the vms don't start and I get called to solve the problem.

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• sqlite3 timestamp (current_timestamp) one hour off

  - by Eiriks

  I run a small crawler on a virtual ubuntu server, initiated by crontab hourly. Datetime is inserted by defaulting the date filed to TIMESTAMP DEFAULT CURRENT_TIMESTAMP. Table creation looks like this: CREATE TABLE links (page TEXT, link TEXT, date TIMESTAMP DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY(page,link)); The datetime gets stored fine, but it one hour off (one hour behind) Norwegian time (GMT +1). The server is located where-ever, I just need it to be on GMT+1. By typing datein the ssh session I get: Wed Dec 19 17:26:02 CET 2012 and that is correct (just now). So where does sqlite3 get it's time from? What must I do to set the time so that sqlite3 gets the time right?

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• Do subdomains need to be defined through domain registerar?

  - by Johnny

  I have bought a new domain name from GoDaddy. Let's say it is abcd.com. On GoDaddy's DNS Managing page, I changed A(Host) part to @ = 74.125.232.215 which is www.google.co.uk's IP address. Now if I type www.abcd.com, it directly goes to www.google.co.uk. But if I type http://test.abcd.com, it cannot be loaded. Do I need to define every subdomain through GoDaddy? Is this how it work? P.S. Amazon EC2 directly generates a subdomain for users to reach their virtual PCs. It cannot be domain registerar dependant. P.S.2. Same question for using "www2" at the start of url.

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• Announcement: Oracle Solaris 11.1

  - by uwes

  On October 3rd at Oracle OpenWorld John Fowler announced Oracle Solaris 11.1 . This first update to Oracle Solaris 11 increases uptime for the Oracle Database: 8x faster database shutdown and start-up Helps DBAs find and resolve I/O issues increasing performance 1.2x Oracle RAC throughput Oracle Solaris 11.1 drives up network utilization by extending network virtualization to include Edge Virtual Bridging and Data Center Bridging that help manage network bandwidth for high priority services and applications. Learn more and share these valuable tools with your customers to encourage them to deploy Oracle Solaris 11.1 Read Press Release here Oracle Solaris 11.1 Data Sheet (PDF) What's New in Solaris 11.1 Oracle Solaris 11.1 FAQs Join the the online web event Oracle Solaris 11 Innovations for your Data Center on November 7, 2012

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• Why enumerator structs are a really bad idea

  - by Simon Cooper

  If you've ever poked around the .NET class libraries in Reflector, I'm sure you would have noticed that the generic collection classes all have implementations of their IEnumerator as a struct rather than a class. As you will see, this design decision has some rather unfortunate side effects... As is generally known in the .NET world, mutable structs are a Very Bad Idea; and there are several other blogs around explaining this (Eric Lippert's blog post explains the problem quite well). In the BCL, the generic collection enumerators are all mutable structs, as they need to keep track of where they are in the collection. This bit me quite hard when I was coding a wrapper around a LinkedList<int>.Enumerator. It boils down to this code: sealed class EnumeratorWrapper : IEnumerator<int> { private readonly LinkedList<int>.Enumerator m_Enumerator; public EnumeratorWrapper(LinkedList<int> linkedList) { m_Enumerator = linkedList.GetEnumerator(); } public int Current { get { return m_Enumerator.Current; } } object System.Collections.IEnumerator.Current { get { return Current; } } public bool MoveNext() { return m_Enumerator.MoveNext(); } public void Reset() { ((System.Collections.IEnumerator)m_Enumerator).Reset(); } public void Dispose() { m_Enumerator.Dispose(); } } The key line here is the MoveNext method. When I initially coded this, I thought that the call to m_Enumerator.MoveNext() would alter the enumerator state in the m_Enumerator class variable and so the enumeration would proceed in an orderly fashion through the collection. However, when I ran this code it went into an infinite loop - the m_Enumerator.MoveNext() call wasn't actually changing the state in the m_Enumerator variable at all, and my code was looping forever on the first collection element. It was only after disassembling that method that I found out what was going on The MoveNext method above results in the following IL: .method public hidebysig newslot virtual final instance bool MoveNext() cil managed { .maxstack 1 .locals init ( [0] bool CS$1$0000, [1] valuetype [System]System.Collections.Generic.LinkedList`1/Enumerator CS$0$0001) L_0000: nop L_0001: ldarg.0 L_0002: ldfld valuetype [System]System.Collections.Generic.LinkedList`1/Enumerator EnumeratorWrapper::m_Enumerator L_0007: stloc.1 L_0008: ldloca.s CS$0$0001 L_000a: call instance bool [System]System.Collections.Generic.LinkedList`1/Enumerator::MoveNext() L_000f: stloc.0 L_0010: br.s L_0012 L_0012: ldloc.0 L_0013: ret } Here, the important line is 0002 - m_Enumerator is accessed using the ldfld operator, which does the following: Finds the value of a field in the object whose reference is currently on the evaluation stack. So, what the MoveNext method is doing is the following: public bool MoveNext() { LinkedList<int>.Enumerator CS$0$0001 = this.m_Enumerator; bool CS$1$0000 = CS$0$0001.MoveNext(); return CS$1$0000; } The enumerator instance being modified by the call to MoveNext is the one stored in the CS$0$0001 variable on the stack, and not the one in the EnumeratorWrapper class instance. Hence why the state of m_Enumerator wasn't getting updated. Hmm, ok. Well, why is it doing this? If you have a read of Eric Lippert's blog post about this issue, you'll notice he quotes a few sections of the C# spec. In particular, 7.5.4: ...if the field is readonly and the reference occurs outside an instance constructor of the class in which the field is declared, then the result is a value, namely the value of the field I in the object referenced by E. And my m_Enumerator field is readonly! Indeed, if I remove the readonly from the class variable then the problem goes away, and the code works as expected. The IL confirms this: .method public hidebysig newslot virtual final instance bool MoveNext() cil managed { .maxstack 1 .locals init ( [0] bool CS$1$0000) L_0000: nop L_0001: ldarg.0 L_0002: ldflda valuetype [System]System.Collections.Generic.LinkedList`1/Enumerator EnumeratorWrapper::m_Enumerator L_0007: call instance bool [System]System.Collections.Generic.LinkedList`1/Enumerator::MoveNext() L_000c: stloc.0 L_000d: br.s L_000f L_000f: ldloc.0 L_0010: ret } Notice on line 0002, instead of the ldfld we had before, we've got a ldflda, which does this: Finds the address of a field in the object whose reference is currently on the evaluation stack. Instead of loading the value, we're loading the address of the m_Enumerator field. So now the call to MoveNext modifies the enumerator stored in the class rather than on the stack, and everything works as expected. Previously, I had thought enumerator structs were an odd but interesting feature of the BCL that I had used in the past to do linked list slices. However, effects like this only underline how dangerous mutable structs are, and I'm at a loss to explain why the enumerators were implemented as structs in the first place. (interestingly, the SortedList<TKey, TValue> enumerator is a struct but is private, which makes it even more odd - the only way it can be accessed is as a boxed IEnumerator!). I would love to hear people's theories as to why the enumerators are implemented in such a fashion. And bonus points if you can explain why LinkedList<int>.Enumerator.Reset is an explicit implementation but Dispose is implicit... Note to self: never ever ever code a mutable struct.

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• How do I change my resolution to 1600*900 for a wide screen monitor?

  - by Madhu

  How do I change my resolution to 1600*900 for a wide screen monitor in Oneiric? My Hardware configuration is as below: madhu@madhu-Home:~$ lspci 00:00.0 Host bridge: Silicon Integrated Systems [SiS] 671MX 00:01.0 PCI bridge: Silicon Integrated Systems [SiS] AGP Port (virtual PCI-to-PCI bridge) 00:02.0 ISA bridge: Silicon Integrated Systems [SiS] SiS968 [MuTIOL Media IO] (rev 01) 00:02.5 IDE interface: Silicon Integrated Systems [SiS] 5513 [IDE] (rev 01) 00:03.0 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f) 00:03.1 USB Controller: Silicon Integrated Systems [SiS] USB 1.1 Controller (rev 0f) 00:03.3 USB Controller: Silicon Integrated Systems [SiS] USB 2.0 Controller 00:04.0 Ethernet controller: Silicon Integrated Systems [SiS] 191 Gigabit Ethernet Adapter (rev 02) 00:05.0 IDE interface: Silicon Integrated Systems [SiS] SATA Controller / IDE mode (rev 03) 00:06.0 PCI bridge: Silicon Integrated Systems [SiS] PCI-to-PCI bridge 00:07.0 PCI bridge: Silicon Integrated Systems [SiS] PCI-to-PCI bridge 00:0f.0 Audio device: Silicon Integrated Systems [SiS] Azalia Audio Controller 00:1f.0 PCI bridge: Silicon Integrated Systems [SiS] PCI-to-PCI bridge 01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS] 771/671 PCIE VGA Display Adapter (rev 10) madhu@madhu-Home:~$ cat /etc/X11/xorg.conf

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• shader3 not enabled error in Eve Online Crucible

  - by Matt Vercoe

  I'm a complete noob at this, and have been trying everything to run Eve Online within Ubuntu 11.10. I have installed through Winetricks no problem, and have enabled the virtual windows desktop within Winetricks. My problem is that after the splash screen for Eve, I get an error message telling me that shader 3 is not enabled. I have an old GEForce 7300LE, but it does support shader 3. I have also tried a few different drivers with no luck. I have tried looking within the NVidia X setting, but can't find anything. Running Eve on Windows 7 is the only reason I'm still using windows, so any help to run it on Ubuntu would be very appreciated, as I'm pulling my hair out trying to figure out something which should be simple.

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• Why is the console hanging randomly?

  - by Josh M.

  Ubuntu 10.10 Server x64 installed as Virtual Box VM. Fresh install plus postgresql and tomcat6 installed via aptitude. Rebooted the server and now when I run some command the console hangs. For instance, I run "sudo shutdown now" and then nothing happens but I am not returned to the prompt. I hit CTRL+C and nothing happens except ^C appears on the following line. I can type whatever and it will show up inline. I switch to tty2 and try to login and I only get as far as [username][enter] and that console hangs. One other thing - after "sudo reboot" the console appears to hang (just like above) when shutting down tomcat6. Any idea what's going on or what I should check? Thanks!

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• Microsoft Ramps up Security in Windows 8

  To the average consumer, improvements in the realm of security may not have the most appeal with it comes to a new working environment such as Windows 8. After all, the operating system's future release is expected to offer such flashy bells and whistles as a nifty Metro interface, a tile-based Start screen that provides a quick jump to different functions, and much more. Although these stylish features may be what jumps out at first, it is going to be hard to deny the usefulness and virtual necessity of Windows 8's new security features. The number of consumers who have turned to the intern...

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• ubuntu is very slow

  - by johnny smithens

  Hello all. I am new with Ubuntu, and it is very slow(even in Ubuntu 2D). The performance is degraded for almost any task. I just reinstalled with amd64, and tried updating the Nvidia drivers with Nvidia Xserver. but it made no difference. This is the output of free -m: total used free shared buffers cached Mem: 3006 1318 1688 0 61 699 -/+ buffers/cache: 556 2449 Swap: 3064 0 3064 tl;dr - total: 3006, used: 1318 When I see the virtual console with Ctrl+Alt+F2, I see constantly: Assuming Drive Cache: write through; asking for cache data failed; It is very frustrating. Thanks in advance!

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• Webcast: Introducing the New Oracle VM Blade Cluster Reference Configuration

  - by Ferhat Hatay

  The Fastest Way to Virtualize Your Datacenter Join our webcast “Best Practices for Speeding Virtual Infrastructure Deployment with Oracle VM” Tues., January 25, 2011 9 a.m. PT / 12 p.m. ET Presented by: Marc Shelley, Senior Manager, Oracle Blades Product Management Tom Lisjac, Senior Member, Oracle Technical Staff Register now for our live webcast! The Oracle VM blade cluster reference configuration addresses the key challenges associated with deploying a virtualization infrastructure. It eliminates or significantly reduces the assembly and integration of the following components BY UP TO 98%: Servers Storage Network Connections Virtualization Software Operating Systems Attend this fact-filled, how-to Webcast with Oracle experts to learn the best practices for deploying the reference configuration for Oracle VM Server for x86 and Sun Blade and Sun Fire x86 rack mount servers. Virtualization is easier than ever with this new configuration. Register now for our live webcast! For more information, see: Oracle white paper: Accelerating deployment of virtualized infrastructures with the Oracle VM blade cluster reference configuration Oracle technical white paper: Best Practices and Guidelines for Deploying the Oracle VM Blade Cluster Reference Configuration

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• How to get Visual Studio 2012 working on Ubuntu 12.04.1?

  - by kamil

  I am trying to get visual studio working in Unity (via Wine) without using any virtual machine or other Desktop Environment alternatives. I am convinced Visual Studio is the ultimate IDE for .Net programming languages. I'm not necessarily for dual booting. I have been working more than 10 years on visual studio and I prefer it over other IDEs. I have tried other IDEs but they didn't work too well for me. Does anyone know a way to get this working natively?

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