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  • Box Selection and Multi-Line Editing with VS 2010

    - by ScottGu
    This is the twenty-second in a series of blog posts I’m doing on the VS 2010 and .NET 4 release. I’ve already covered some of the code editor improvements in the VS 2010 release.  In particular, I’ve blogged about the Code Intellisense Improvements, new Code Searching and Navigating Features, HTML, ASP.NET and JavaScript Snippet Support, and improved JavaScript Intellisense.  Today’s blog post covers a small, but nice, editor improvement with VS 2010 – the ability to use “Box Selection” when performing multi-line editing.  This can eliminate keystrokes and enables some slick editing scenarios. [In addition to blogging, I am also now using Twitter for quick updates and to share links. Follow me at: twitter.com/scottgu] Box Selection Box selection is a feature that has been in Visual Studio for awhile (although not many people knew about it).  It allows you to select a rectangular region of text within the code editor by holding down the Alt key while selecting the text region with the mouse.  With VS 2008 you could then copy or delete the selected text. VS 2010 now enables several more capabilities with box selection including: Text Insertion: Typing with box selection now allows you to insert new text into every selected line Paste/Replace: You can now paste the contents of one box selection into another and have the content flow correctly Zero-Length Boxes: You can now make a vertical selection zero characters wide to create a multi-line insert point for new or copied text These capabilities can be very useful in a variety of scenarios.  Some example scenarios: change access modifiers (private->public), adding comments to multiple lines, setting fields, or grouping multiple statements together. Great 3 Minute Box-Selection Video Demo Brittany Behrens from the Visual Studio Editor Team has an excellent 3 minute video that shows off a few cool VS 2010 multi-line code editing scenarios with box selection:   Watch it to learn a few ways you can use this new box selection capability to optimize your typing in VS 2010 even further: Hope this helps, Scott P.S. You can learn more about the VS Editor by following the Visual Studio Team Blog or by following @VSEditor on Twitter.

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  • MySQL Enterprise Monitor 2.3.12 Is Now Available!

    - by Andy Bang
    We are pleased to announce that MySQL Enterprise Monitor 2.3.12 is now available for download on the My Oracle Support (MOS) web site. It will also be available via the Oracle Software Delivery Cloud in approximately 1-2 weeks. This is a maintenance release that contains several new features and fixes a number of bugs. You can find more information on the contents of this release in the changelog: http://dev.mysql.com/doc/mysql-monitor/2.3/en/mem-news-2-3-12.html You will find binaries for the new release on My Oracle Support: https://support.oracle.com Choose the "Patches & Updates" tab, and then use the "Product or Family (Advanced Search)" feature. And from the Oracle Software Delivery Cloud (in about 1-2 weeks): http://edelivery.oracle.com/ Choose "MySQL Database" as the Product Pack and you will find the Enterprise Monitor along with other MySQL products. If you haven't looked at 2.3 recently, please do so now and let us know what you think. Thanks and Happy Monitoring! - The MySQL Enterprise Tools Development Team

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  • VGA monitor won't detect on NVIDIA Quadro NVS 4200M

    - by tanmayk
    I am on a Dell Latitude E6420 and just installed 12.04. When I plug in my external monitor's VGA cable, the laptop doesn't detect any new monitor. Here's the output of my lspci: 00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09) 00:01.0 PCI bridge: Intel Corporation Xeon E3-1200/2nd Generation Core Processor Family PCI Express Root Port (rev 09) 00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04) 00:16.3 Serial controller: Intel Corporation 6 Series/C200 Series Chipset Family KT Controller (rev 04) 00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (rev 04) 00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 04) 00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04) 00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b4) 00:1c.1 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2 (rev b4) 00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b4) 00:1c.3 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 4 (rev b4) 00:1c.5 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 6 (rev b4) 00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 04) 00:1f.0 ISA bridge: Intel Corporation QM67 Express Chipset Family LPC Controller (rev 04) 00:1f.2 RAID bus controller: Intel Corporation 82801 Mobile SATA Controller [RAID mode] (rev 04) 00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 04) 01:00.0 VGA compatible controller: NVIDIA Corporation GF119 [Quadro NVS 4200M] (rev a1) 01:00.1 Audio device: NVIDIA Corporation HDMI Audio stub (rev a1) 03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205 (rev 34) 0b:00.0 SD Host controller: O2 Micro, Inc. Device 8221 (rev 05) 0b:00.1 Mass storage controller: O2 Micro, Inc. Device 8231 (rev 03) I tried installing the Quadro NVS 4200M from the nvidia website but got stuck in TTY after the installation finished. Any ideas as to how I can get the external monitor to work? Thanks!

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  • Need a PCIe desktop graphics card for dual-monitor

    - by Graham
    I have a mid-2008 workstation with two HD monitors supporting HDMI and DVI inputs. Since Ubuntu 11.10, I have experienced no end of trouble with my NVidia Quadro NVS 290 in TwinView dual-monitor output. Others have similar desktop TwinView woes. I want a new graphics card. Previously I asked for a graphics card recommendation and response was Nvidia Geforce GTS 450... but really I'm looking for someone who has actually got a working dual-monitor desktop to tell me what card they use so I can get something that is known to work. So please, people who have no-issues with their 64-bit Ubuntu 12.04 Unity 3D desktop spread across two HD-resolution external monitors (either DVI or HDMI connector), and who also run Google Chrome (which throws a spanner due to its own GPU compositing)... please let me know what graphics card you have so I can buy one. Gathering Options These seem to be the Nvidia cards featuring dual DVI. But they all seem to be gaming cards - what has dual-DVI, good support, but is not a massive gaming card? Nvidia GTS 450 (previously recommended) - 2x DVI Nvidia GTX 550 Ti (used by System76) - 2x DVI Nvidia GT 430 (used by System76) - 1xDVI, 1xHDMI Nvidia GT 640 (found on NVidia site) - 1xDVI, 1xHDMI (also GT 620, GT 630) Has anyone had a good desktop dual-monitor Unity 3D experience with ATI cards?

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  • Second monitor not detected

    - by configurator
    Note: I've seen this question quite a lot, but in all the cases I could find with answers, the answer was either "I don't know" or "use nvidia-settings (which is irrelevant to me)." I'm using Intel Sandybridge Desktop graphics, with a P8H61-M LE motherboard. How do I get Ubuntu to detect my second monitor? Clicking "Detect Displays" here doesn't do anything. Here's some system info: $ lspci | grep VGA 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) $ uname -a Linux clyde 3.5.0-13-generic #13-Ubuntu SMP Tue Aug 28 08:31:47 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux $ hardinfo [copied from the UI] -Display- Resolution : 1920x1080 pixels Vendor : The X.Org Foundation Version : 1.12.3 -Monitors- Monitor 0 : 1920x1080 pixels -Extensions- BIG-REQUESTS Composite DAMAGE DOUBLE-BUFFER DPMS DRI2 GLX Generic Event Extension MIT-SCREEN-SAVER MIT-SHM RANDR RECORD RENDER SECURITY SGI-GLX SHAPE SYNC X-Resource XC-MISC XFIXES XFree86-DGA XFree86-VidModeExtension XINERAMA XInputExtension XKEYBOARD XTEST XVideo -OpenGL- Vendor : Intel Open Source Technology Center Renderer : Mesa DRI Intel(R) Sandybridge Desktop Version : 3.0 Mesa 8.1-devel Direct Rendering : Yes I've tried upgrading everything from ppa:xorg-edgers/ppa and ppa:glasen/intel-driver. I've also installed various tools I've found in other threads (e.g. hardinfo) but they weren't really helpful to me as I don't know what to make of the data. How do I get Ubuntu to detect my second monitor?

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  • UML Diagrams of Multi-Threaded Applications

    - by PersonalNexus
    For single-threaded applications I like to use class diagrams to get an overview of the architecture of that application. This type of diagram, however, hasn’t been very helpful when trying to understand heavily multi-threaded/concurrent applications, for instance because different instances of a class "live" on different threads (meaning accessing an instance is save only from the one thread it lives on). Consequently, associations between classes don’t necessarily mean that I can call methods on those objects, but instead I have to make that call on the target object's thread. Most literature I have dug up on the topic such as Designing Concurrent, Distributed, and Real-Time Applications with UML by Hassan Gomaa had some nice ideas, such as drawing thread boundaries into object diagrams, but overall seemed a bit too academic and wordy to be really useful. I don’t want to use these diagrams as a high-level view of the problem domain, but rather as a detailed description of my classes/objects, their interactions and the limitations due to thread-boundaries I mentioned above. I would therefore like to know: What types of diagrams have you found to be most helpful in understanding multi-threaded applications? Are there any extensions to classic UML that take into account the peculiarities of multi-threaded applications, e.g. through annotations illustrating that some objects might live in a certain thread while others have no thread-affinity; some fields of an object may be read from any thread, but written to only from one; some methods are synchronous and return a result while others are asynchronous that get requests queued up and return results for instance via a callback on a different thread.

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  • Hack a Linksys Router into a Ambient Data Monitor

    - by Jason Fitzpatrick
    If you have a data source (like a weather report, bus schedule, or other changing data set) you can pull it and display it with an ambient data monitor; this fun build combines a hacked Linksys router and a modified toy bus to display transit arrival times. John Graham-Cumming wanted to keep an eye on the current bus arrival time tables without constantly visiting the web site to check them. His workaround turns a hacked Linksys router, a display, a modified London city bus (you could hack apart a more project-specific enclosure, of course), and a simple bit code that polls the bus schedule’s API, into a cool ambient data monitor that displays the arrival time, in minutes, of the next two buses that will pass by his stop. The whole thing could easily be adapted to another API to display anything from stock prices to weather temps. Hit up the link below for more information on the project. Ambient Bus Arrival Monitor Hacked from Linksys Router [via Make] Make Your Own Windows 8 Start Button with Zero Memory Usage Reader Request: How To Repair Blurry Photos HTG Explains: What Can You Find in an Email Header?

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  • Dual monitor setup can cause boot problem?

    - by kriszpontaz
    I have a two monitor setup, one 22" (1680x1050 res., 16:10) and another 19" (1280x1024 res. 5:4). I've installed ubuntu 11.10 beta2 x86, and the installation worked fine, the system boot was successful. I've upgraded ubuntu from the main server, and after restart, booting with the kernel 3.0.0-13, my system hangs up with a purple screen, and than nothing happens (the system boots successful with the kernel image 3.0.0-8). Nvidia current drivers not installed, but if i install it, the situation is the same. I have an Nvidia 9600GT installed. I tried to boot with one screen attached, I've tried each port, but no luck at all. With kernel image 3.0.0-8 the system successfully boots with each display attached, but the farther kernels (3.0.0-11; 3.0.0-12; ect.) all freezes, even one display, or multiple attached. I have two systems with ubuntu installed, and the other (with Ati HD 2400XT, latest closed drivers) don't have any issues like this, I wrote about. Update: The problem solved by reinstalling the operatin system, without automatically installing updates during install, with only one monitor attached. After completing installation, and clean reboot, i've installed closed nVidia drivers. After all, i found it's safe to connect another monitor to the system, it's not causing any problems. Probably the situation stays like this.

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  • Multi Threading - How to split the tasks

    - by Motig
    if I have a game engine with the basic 'game engine' components, what is the best way to 'split' the tasks with a multi-threaded approach? Assuming I have the standard components of: Rendering Physics Scripts Networking And a quad-core, I see two ways of multi-threading: Option A ('Vertical'): Using this approach I can allow one core for each component of the engine; e.g. one core for the Rendering task, one for the Physics, etc. Advantages: I do not need to worry about thread-safety within each component I can take advantage of special optimizations provided for single-threaded access (e.g. DirectX offers a flag that can be set to tell it that you will only use single-threading) Option B ('Horizontal'): Using this approach, each task may be split up into 1 <= n <= numCores threads, and executed simultaneously, one after the other. Advantages: Allows for work-sharing, i.e. each thread can take over work still remaining as the others are still processing I can take advantage of libraries that are designed for multi-threading (i.e. ... DirectX) I think, in retrospect, I would pick Option B, but I wanted to hear you guys' thoughts on the matter.

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  • MySQL Enterprise Monitor 2.3.11 Is Now Available!

    - by Andy Bang
    We are pleased to announce that MySQL Enterprise Monitor 2.3.11 is now available for download on the My Oracle Support (MOS) web site. It will also be available via the Oracle Software Delivery Cloud in approximately 1-2 weeks. This is a maintenance release that contains several new features and fixes a number of bugs. You can find more information on the contents of this release in the changelog: http://dev.mysql.com/doc/mysql-monitor/2.3/en/mem-news-2-3-11.html You will find binaries for the new release on My Oracle Support: https://support.oracle.com Choose the "Patches & Updates" tab, and then use the "Product or Family (Advanced Search)" feature. And from the Oracle Software Delivery Cloud (in about 1-2 weeks): http://edelivery.oracle.com/ Choose "MySQL Database" as the Product Pack and you will find the Enterprise Monitor along with other MySQL products. If you haven't looked at 2.3 recently, please do so now and let us know what you think. Thanks and Happy Monitoring! - The MySQL Enterprise Tools Development Team

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  • Dual Monitor in Ubuntu 11.10 is resetting the theme

    - by Mengu
    i'm experiencing a strange problem with dual monitors. when i set the dual monitor via "nvidia settings" and save the setting to xorg.conf, the default unity theme and icons are turning back to gtk default. i also get an error telling me "could not apply the stored configuration for monitors" here is my xorg.conf: # nvidia-settings: X configuration file generated by nvidia-settings # nvidia-settings: version 280.13 (buildd@yellow) Fri Aug 5 12:31:28 UTC 2011 Section "ServerLayout" Identifier "Layout0" Screen 0 "Screen0" 0 0 InputDevice "Keyboard0" "CoreKeyboard" InputDevice "Mouse0" "CorePointer" Option "Xinerama" "0" EndSection Section "Files" EndSection Section "InputDevice" # generated from default Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/psaux" Option "Emulate3Buttons" "no" Option "ZAxisMapping" "4 5" EndSection Section "InputDevice" # generated from default Identifier "Keyboard0" Driver "kbd" EndSection Section "Monitor" # HorizSync source: edid, VertRefresh source: edid Identifier "Monitor0" VendorName "Unknown" ModelName "Chi Mei Optoelectronics corp." HorizSync 30.0 - 75.0 VertRefresh 60.0 Option "DPMS" EndSection Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" BoardName "GeForce GT 540M" EndSection Section "Screen" Identifier "Screen0" Device "Device0" Monitor "Monitor0" DefaultDepth 24 Option "TwinView" "1" Option "TwinViewXineramaInfoOrder" "DFP-0" Option "metamodes" "DFP: nvidia-auto-select +0+0, CRT: 1680x1050 +1920+0" SubSection "Display" Depth 24 EndSubSection EndSection here is an example of what i'm talking about: http://i.stack.imgur.com/vrlW1.png how can i fix this? thanks in advance.

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  • Problems with dual monitor & resolutions, only in 14.04

    - by theLadder
    I installed Ubuntu 14.04 but i am having weird problems with my dual monitors and the resolutions. I also tried Xubuntu 14.04 and was having the same problem. I have one 32 inch LG TV with 1920x1080 and one monitor with 1280x1024 resolution. When i first start my 32 inch gets 1360x768, if i then try to change to 1920x1080, everythings looks fine and the prompt asking me if i want to keep settings comes up and starts the countdown, but after 2 seconds my computer freezes, and after a few more seconds it reboots itself. However, if i disable my smaller monitor first, i can change to 1920x1080 on my 32 inch without problems, but if i then activate the second monitor the same problem happens again. in Xubuntu 14.04 i can change the refresh rate, if i run the 32 inch at 30hz or 50hz everytying works, but i would like to be able to run it at 60hz. I'm currently running Xubuntu 13.10 without this problem. My graphics card is a ATI Radeon HD 4850. What is causing this problem, grahpics drivers? Kernel? Xorg? And how do i solve it?

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  • In Windows 7, why won't my display stay off despite the power settings saying it should?

    - by Jer
    I'm completely stumped by this. My simple use case is that when I'm in bed, I use a cordless mouse to browse the web, watch videos, etc. - the monitor is across the room. When I'm going to sleep, I want to shut the monitor off. I also want to be able to turn it back on in the morning. I just want to turn the monitor off and on using only the mouse. I thought of creating a power setting that turned the monitor off asap (the shortest amount of time is one minute; that's fine). I have one that does this. It worked great for almost a year on my old XP machine, and for about four months on my new Windows 7 laptop (which I essentially use as a desktop). All of a sudden a couple weeks ago, it just stopped working - my monitor won't turn off on its own anymore. Here are the settings: I tried other options. Based on the advice here I tried nircmd. This seemed great. I created a shortcut with the command line: "C:\Program Files\nircmd\nircmd.exe" cmdwait 1000 monitor off I click this, and in one second the monitor goes off. However about five seconds later it turns back on, and I've been extra careful to make sure the mouse isn't moving. I have no idea what's going on. Based on both of these things, my only guess is that something could be running in the background which somehow makes the computer think it's in use. I've tried killing as many programs as possible but I still get the same behavior. Any advice? I'm mainly curious about how to debug, but am open to other suggestions about turning the monitor off and on with just the mouse as well.

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  • Multi-monitor Usage

    - by logan2
    How many different applications do you use with a 2, 3, 4, 5 or more monitor setup? What's the most sophisticated multi-monitor setup you've seen? To be more specific, I would like to know exactly how you use your multi-monitor setup and how can I make better use of my own. How does someone take full advantage of a multi-monitor setup? And does having more monitors help your productivity?

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  • What does the "Maximum Frequency" number mean in the Windows Resource Monitor?

    - by nhinkle
    In the Windows Resource Monitor's CPU tab, there is a status box and graph for the "Maximum Frequency", right next to the "CPU Usage" values. What does this mean? The value is sometimes over 100% on my system... what could that imply? By looking at CPU-z's real-time report of the processor's clock speed, it seems to be loosely related to what frequency the CPU is running at, which would imply that it means "percent of maximum possible frequency the CPU is running at"; this would be of relevance on systems with SpeedStep and/or TurboBoost technology (or similar). Furthermore, setting the system to "power saving mode" lowers the "maximum frequency" value to around 60%, while setting it to "high performance" mode sets it to around 110%. However, the percentage does not seem to exactly correlate to the CPU speed being shown. What value is this actually representing then?

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  • Has anyone tried the "Secret LCD Monitor" hack? [closed]

    - by cornjuliox
    I'm genuinely curious to know, has anyone tried this hack? I can get LCD monitors for cheap at a place near where I live, and I'd like to try it myself, but I'd like to get more info on it before I do so to increase my chances of success. I'm looking for more info on the entire process, especially about any solvents I can use should I run into any glue problems. Questions for anyone that HAS tried it: Does it actually work, or is this some gag? If it works, is there any decrease in image quality or viewing angles? Since the polarization filters are essentially stuck to glasses, does that mean you're going to have to sit directly in front of the monitor at all times, and any shift in your position means that you won't be able to see the image? Does it improve/worsen ghosting or other LCD artifacts? Are there any problems with eye strain?

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  • What is the largest flatscreen monitor available for PC use?

    - by Avery Payne
    I'll qualify this specifically (by order of preference): must have the highest diagonal measurement, widescreen or "normal" aspect ratio doesn't matter here, just the diagonal. must have the highest resolution available, which means 72 inches of 1280x1024 won't cut it. must not have a TV tuner built into it, I'm not looking for a TV set, this is a monitor! must be available at a retail outlet that caters to the general public, i.e. Best Buy, Sears, Costco (all of these examples are in the U.S., although you can suggest something from whatever chain is in your area/nation/geography). Non-retail or non-physical venues like eBay, or businesses that only cater to other businesses, do not qualify under this requirement. I should be able to walk into this place and purchase it, not just whip up an order online. If you are unsure about this requirement, just ask yourself: can I physically see it before I open my wallet and purchase it?

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  • When computer turns on: keyboard/mouse/monitor don't work?

    - by dave
    the computer is barely good,at least i think..features Intel core 2 4 GB ram Nvidia Radeon 9600 512 mb Gigabite motherboad (the others i can't remember).. Used this computer for 3 years with no problem...The problem started one day after while it froze everything, then I shut down with removing the electricity power. A few hours later, I tried to log in to the computer but nothing moved. Nor keyboard nor mouse nor monitor worked, I was thinking that should be a delay so I left it some time. After a minute it turned off without my help around 30 seconds then it turned on automatically, but was the same problem like before and it goes again and again...any suggestions? If more info/specs required, let me know.

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  • How can I monitor network usage by process on Mac OS X?

    - by psmith
    Is there any way to find out which process using how much internet bandwidth on Mac OS X Lion? I'm on mobile internet now, which is not very fast, so it would be nice if I can tell that for example, Chrome using 10kB/s, and Skype using 2kB/s. I can see the total amount of traffic in Activity Monitor, but it is not enough for me. I'd like to use an existing application, not interested to write an app like this. And I'm not interested in the actual traffic, only the number of bytes transferred and received by each processes.

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  • Ubuntu Gnome 14.04 - 100% CPU usage alternating between cores

    - by AwDeOh
    I've noticed my Ubuntu Gnome 14.04 has been getting a bit sluggish lately - things like Gnome Shell overview animation are jerky where they were lightning fast, Elder Scrolls Online is stuttering and dropping to low FPS where I previously had a solid 50-60 fps. Out of interest I looked at the CPU History, and when running nothing but the system monitor, I was getting this: That was 15 minutes ago. The 100% load seemed to be alternating between the cores. PC specs: i3 2130 processor. 8gb DDR3 RAM. ASUS P8-Z77M motherboard. Samsung 128gb SSD I've been trying to reproduce the problem, and while I'm not getting the 100% any more at idle, the system monitor is showing an average load of about 20-30%, that's with just Chrome and the System Monitor open. Oddly, if I touch nothing, it'll average out to about 20% - if I start moving the mouse around and do some typing, it's closer to 40%. Is this normal? Any help appreciated, I wouldn't even know where to start here..

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  • Convincing Upper Management the need of larger monitors for Developers

    - by The Rubber Duck
    The company I work for has recently hired on several developers, and there are a limited number of monitors to go around. There are two types in the office - a standard 15" (thankfully flatscreen) and a widescreen 23". No developer has a machine capable of a dual monitor setup, and the largest monitors went to the people who got here first. Three or four new senior level developers only have a 15" monitor to work on. To make matters worse, there are perhaps a total of 25-30 DBAs/Testers/Admin types in the company who all have dual screen 23" setups. We have brought the issue to management, and they refuse to take away large monitors from people who have been here for years for the sake of new employees, even if they are senior level. We have pitched the idea of testers sacrificing a large monitor for one of our small ones, but they won't go for that either. What can I say to management to illustrate the need of monitors for developers?

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  • Erratic display behaviour on 12.04 using an Asus Zenbook

    - by Azarias R
    When I first plugged in my 23 inch monitor through the mini-VGA port, everything worked...both display were detected, and worked. On the second or third plug in, the internal display would turn off, and only the external display would work. When I try to 'detect monitor', I got "could not set the configuration for crtc 63" a few times. Now, when I plug in the external display, I get a screen full of orange color on the external display, and the laptop display turns off. The only way to get things back is to force turn off the laptop and restart. Unplugging/replugging monitor doesn't work, and seems like ubuntu crashes. Can anyone help?

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  • Does this use of Monitor.Wait/Pulse have a race condition?

    - by jw
    I have a simple producer/consumer scenario, where there is only ever a single item being produced/consumed. Also, the producer waits for the worker thread to finish before continuing. I realize that kind of obviates the whole point of multithreading, but please just assume it really needs to be this way (: This code doesn't compile, but I hope you get the idea: // m_data is initially null // This could be called by any number of producer threads simultaneously void SetData(object foo) { lock(x) // Line A { assert(m_data == null); m_data = foo; Monitor.Pulse(x) // Line B while(m_data != null) Monitor.Wait(x) // Line C } } // This is only ever called by a single worker thread void UseData() { lock(x) // Line D { while(m_data == null) Monitor.Wait(x) // Line E // here, do something with m_data m_data = null; Monitor.Pulse(x) // Line F } } Here is the situation that I am not sure about: Suppose many threads call SetData() with different inputs. Only one of them will get inside the lock, and the rest will be blocked on Line A. Suppose the one that got inside the lock sets m_data and makes its way to Line C. Question: Could the Wait() on Line C allow another thread at Line A to obtain the lock and overwrite m_data before the worker thread even gets to it? Supposing that doesn't happen, and the worker thread processes the original m_data, and eventually makes its way to Line F, what happens when that Pulse() goes off? Will only the thread waiting on Line C be able to get the lock? Or will it be competing with all the other threads waiting on Line A as well? Essentially, I want to know if Pulse()/Wait() communicate with each other specially "under the hood" or if they are on the same level with lock(). The solution to these problems, if they exist, is obvious of course - just surround SetData() with another lock - say, lock(y). I'm just curious if it's even an issue to begin with.

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