Search Results

Search found 18576 results on 744 pages for 'lock screen'.

facebook twitter digg google delicious technorati stumbleupon myspace wordpress linkedin gmail igoogle windows live tumblr viadeo yahoo buzz yahoo mail yahoo bookmarks favorites email print

Page 16/744 | < Previous Page | 12 13 14 15 16 17 18 19 20 21 22 23  | Next Page >

  • Well tested C/C++ lock free queue?

    - by uj
    I am looking for a well-tested, publicly available C/C++ implementation of a lock free queue. I need at least multiple-producers/single-consumer functionality. Multiple-consumers is even better, if exists. I'm targetting VC's _Interlocked... intrinsics, though anything which is straight forward to port would be fine. Could anyone give any pointers?

    Read the article

  • Dual Screen screen adjustments for wallpaper

    - by Rogue
    I have a dual screen setup one is horizontal one is vertical problem is that the wallpaper on the vertical one displays as horizontal so i have black space above and below the wallpaper. How can turn the wallpaper around so it displays correctly on the vertical screen.

    Read the article

  • Lock free multiple readers single writer

    - by dummzeuch
    I have got an in memory data structure that is read by multiple threads and written by only one thread. Currently I am using a critical section to make this access threadsafe. Unfortunately this has the effect of blocking readers even though only another reader is accessing it. There are two options to remedy this: use TMultiReadExclusiveWriteSynchronizer do away with any blocking by using a lock free approach For 2. I have got the following so far (any code that doesn't matter has been left out): type TDataManager = class private FAccessCount: integer; FData: TDataClass; public procedure Read(out _Some: integer; out _Data: double); procedure Write(_Some: integer; _Data: double); end; procedure TDataManager.Read(out _Some: integer; out _Data: double); var Data: TDAtaClass; begin InterlockedIncrement(FAccessCount); try // make sure we get both values from the same TDataClass instance Data := FData; // read the actual data _Some := Data.Some; _Data := Data.Data; finally InterlockedDecrement(FAccessCount); end; end; procedure TDataManager.Write(_Some: integer; _Data: double); var NewData: TDataClass; OldData: TDataClass; ReaderCount: integer; begin NewData := TDataClass.Create(_Some, _Data); InterlockedIncrement(FAccessCount); OldData := TDataClass(InterlockedExchange(integer(FData), integer(NewData)); // now FData points to the new instance but there might still be // readers that got the old one before we exchanged it. ReaderCount := InterlockedDecrement(FAccessCount); if ReaderCount = 0 then // no active readers, so we can safely free the old instance FreeAndNil(OldData) else begin /// here is the problem end; end; Unfortunately there is the small problem of getting rid of the OldData instance after it has been replaced. If no other thread is currently within the Read method (ReaderCount=0), it can safely be disposed and that's it. But what can I do if that's not the case? I could just store it until the next call and dispose it there, but Windows scheduling could in theory let a reader thread sleep while it is within the Read method and still has got a reference to OldData. If you see any other problem with the above code, please tell me about it. This is to be run on computers with multiple cores and the above methods are to be called very frequently. In case this matters: I am using Delphi 2007 with the builtin memory manager. I am aware that the memory manager probably enforces some lock anyway when creating a new class but I want to ignore that for the moment. Edit: It may not have been clear from the above: For the full lifetime of the TDataManager object there is only one thread that writes to the data, not several that might compete for write access. So this is a special case of MREW.

    Read the article

  • Strange monitor issue - screen goes black after a few seconds

    - by Scott Szretter
    My LCD monitor display is going black (turning off). It's a Samsung SYncMaster 2233 widescreen. I am trying to figure out if there is anything I can do about it, or if the monitor is junk. I have tried multiple computers, all have the same issue. I have tried a different vga cable, same issue. Power and video cables are tight / double checked. When I power on the monitor, the blue light turns on at the bottom. Then a second or two later the video comes up as expected and it looks fine. However, about 2-3 seconds after that, the screen goes black. The blue light is still on and solid at the bottom (blue light normally flashes when the monitor is sleeping). If I power cycle the monitor, same thing happens. With no computer connected or when I unplug the vga cable, I see the searching for signal message "digital", then the screen goes black. However it usually shows "digital" then "analog" after that and switches between the two a few times. The buttons on the side do not do anything, although they may be, I just can not see if they are or not. I can usually get the "digital" message by pressing the buttons on the side, but then it quickly goes black again. What is really strange is sometimes I can get it to work fine. I am not sure what the difference is. Last week I connected it up and it worked fine and it stayed fine for at least a week! I did not turn it off or anything, I just let the OS put the display to sleep. Then this week one morning I started having the screen going black issue again. Seems like something is either loose inside or beginning to fail. Do you think there is any hope for it? update: pushing the input select button causes the "digital" and "analog" messages to flash on the screen, but only for a few seconds then it goes black. When it was working properly, those messages would flash back and fourth for probably 10-20 seconds then a message would show saying check input signal, but now just a black screen.

    Read the article

  • Which is Better? The Start Screen in Windows 8 or the Old Start Menu? [Analysis]

    - by Asian Angel
    There has been quite a bit of controversy surrounding Microsoft’s emphasis on the new Metro UI Start Screen in Windows 8, but when it comes down to it which is really better? The Start Screen in Windows 8 or the old Start Menu? Tech blog 7 Tutorials has done a quick analysis to see which one actually works better (and faster) when launching applications and doing searches. Images courtesy of 7 Tutorials. You can view the results and a comparison table by visiting the blog post linked below. Windows 8 Analysis: Is the Start Screen an Improvement vs. the Start Menu? [7 Tutorials] How to Stress Test the Hard Drives in Your PC or Server How To Customize Your Android Lock Screen with WidgetLocker The Best Free Portable Apps for Your Flash Drive Toolkit

    Read the article

  • Inexpensive, simple screen recording application for mac

    - by donut
    I am more and more consistently running into the need to create screencasts (record my screen) for clients to show them how to use programs or websites. Up until now I've been using Jing and it's been wonderful. But I would like something that can give me something less annoying than a .swf. A .mov or, best of all, something that plays without fuss on Mac and Windows. Also, the 5-minute limit is annoying, but not show stopping. Basically, I'd like to be able to actually give them the file on a CD or something instead of relying on whatever host I use staying up for eternity. To sum up, here's what I require: Record a portion or all of the screen. Records audio from mic while recording screen. Exports files easily playable on Mac and Windows (requiring Quicktime is okay, but not ideal) Will work on Mac OS 10.5+ Allows recording videos of at least 5 minutes. Text in recorded videos is easily readable when exported. Bonuses points for: Records videos greater than 5 minutes Exported videos will work in Windows Media player without any fuss. I haven't upgraded to Snow Leopard yet but I know it has some screen recording stuff built in but I don't know if it would be sufficient or not. The reason I say, "simple" is because most of the applications I've seen do much more than I need (I mean, Jing is nearly perfect for my needs) and cost more than I would like to spend.

    Read the article

  • Why lock statements don't scale

    - by Alex.Davies
    We are going to have to stop using lock statements one day. Just like we had to stop using goto statements. The problem is similar, they're pretty easy to follow in small programs, but code with locks isn't composable. That means that small pieces of program that work in isolation can't necessarily be put together and work together. Of course actors scale fine :) Why lock statements don't scale as software gets bigger Deadlocks. You have a program with lots of threads picking up lots of locks. You already know that if two of your threads both try to pick up a lock that the other already has, they will deadlock. Your program will come to a grinding halt, and there will be fire and brimstone. "Easy!" you say, "Just make sure all the threads pick up the locks in the same order." Yes, that works. But you've broken composability. Now, to add a new lock to your code, you have to consider all the other locks already in your code and check that they are taken in the right order. Algorithm buffs will have noticed this approach means it takes quadratic time to write a program. That's bad. Why lock statements don't scale as hardware gets bigger Memory bus contention There's another headache, one that most programmers don't usually need to think about, but is going to bite us in a big way in a few years. Locking needs exclusive use of the entire system's memory bus while taking out the lock. That's not too bad for a single or dual-core system, but already for quad-core systems it's a pretty large overhead. Have a look at this blog about the .NET 4 ThreadPool for some numbers and a weird analogy (see the author's comment). Not too bad yet, but I'm scared my 1000 core machine of the future is going to go slower than my machine today! I don't know the answer to this problem yet. Maybe some kind of per-core work queue system with hierarchical work stealing. Definitely hardware support. But what I do know is that using locks specifically prevents any solution to this. We should be abstracting our code away from the details of locks as soon as possible, so we can swap in whatever solution arrives when it does. NAct uses locks at the moment. But my advice is that you code using actors (which do scale well as software gets bigger). And when there's a better way of implementing actors that'll scale well as hardware gets bigger, only NAct needs to work out how to use it, and your program will go fast on it's own.

    Read the article

  • (Google AppEngine) Memcache Lock Entry

    - by Friedrich
    Hi, i need a locking in memcache. Since all operations are atomic that should be an easy task. My idea is to use a basic spin-lock mechanism. So every object that needs locking in memcache gets a lock object, which will be polled for access. // pseudo code // try to get a lock int lock; do { lock = Memcache.increment("lock", 1); } while(lock != 1) // ok we got the lock // do something here // and finally unlock Memcache.put("lock", 0); How does such a solution perform? Do you have a better idea how to lock a memcache object? Best regards, Friedrich Schick

    Read the article

  • Python Locking Implementation (with threading module)

    - by Matty
    This is probably a rudimentary question, but I'm new to threaded programming in Python and am not entirely sure what the correct practice is. Should I be creating a single lock object (either globally or being passed around) and using that everywhere that I need to do locking? Or, should I be creating multiple lock instances in each of the classes where I will be employing them. Take these 2 rudimentary code samples, which direction is best to go? The main difference being that a single lock instance is used in both class A and B in the second, while multiple instances are used in the first. Sample 1 class A(): def __init__(self, theList): self.theList = theList self.lock = threading.Lock() def poll(self): while True: # do some stuff that eventually needs to work with theList self.lock.acquire() try: self.theList.append(something) finally: self.lock.release() class B(threading.Thread): def __init__(self,theList): self.theList = theList self.lock = threading.Lock() self.start() def run(self): while True: # do some stuff that eventually needs to work with theList self.lock.acquire() try: self.theList.remove(something) finally: self.lock.release() if __name__ == "__main__": aList = [] for x in range(10): B(aList) A(aList).poll() Sample 2 class A(): def __init__(self, theList,lock): self.theList = theList self.lock = lock def poll(self): while True: # do some stuff that eventually needs to work with theList self.lock.acquire() try: self.theList.append(something) finally: self.lock.release() class B(threading.Thread): def __init__(self,theList,lock): self.theList = theList self.lock = lock self.start() def run(self): while True: # do some stuff that eventually needs to work with theList self.lock.acquire() try: self.theList.remove(something) finally: self.lock.release() if __name__ == "__main__": lock = threading.Lock() aList = [] for x in range(10): B(aList,lock) A(aList,lock).poll()

    Read the article

  • Java synchronized method lock on object, or method?

    - by wuntee
    If I have 2 synchronized methods in the same class, but each accessing different variables, can 2 threads access those 2 methods at the same time? Does the lock occur on the object, or does it get as specific as the variables inside the synchronized method? Example: class x{ private int a; private int b; public synchronized void addA(){ a++; } public synchronized void addB(){ b++; } } Can 2 threads access the same instance of class x performing x.addA() and x.addB() at the same time?

    Read the article

  • How can I lock screen on lxde

    - by maniat1k
    Like gnome Control + alt + L In Lxde how can i do that? What I have to intall to do this? thanks --searching for a solution on my own but... ok if I do alt+f2 and type xscreensaver-command -lock that's a small solution. tryed to do an small script but it's not working.. this is what I do vi lock.sh #!/bin/bash xscreensaver-command -lock exit 0 chmod +x lock.sh but this doesnt work.. ideas?

    Read the article

  • Server 2008 locks me out when not using the machine for 10 minutes after installing SP2

    - by Daniel Magliola
    I have recently installed Service Pack 2 on my Windows Server 2008 machine (which I use actively for development, and i'm always logged on to). Now, after this installation, when I don't use the machine for some time (let's say, 10 minutes), it locks itself so I have to press Ctrl+Alt+Del and log back in. I have already checked the Screen Saver settings, and it's "None", as it always has been. I also looked into power settings and everything looks right (20 mins to turn off monitor, and i haven't found any settings regarding locking me in there). Do you have any idea what I can do so that it won't lock me out after not using the machine for a while? Thanks! Daniel

    Read the article

  • /var/lib/dpkg/lock.....help!

    - by Pycnopodia
    I had to reinstall the entire OS a little while ago and I have been trying to reinstall all of the programs I had before but I got a bit a of a problem now. I was trying to download dropbox from synaptic but it cannot finish the process and as a result I cannot update anything anymore. The line that comes out is: E: Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable) E: Unable to lock the administration directory (/var/lib/dpkg/), is another process using it? I have tried: sudo apt-get install -f sudo apt-get -f install sudo rm /var/lib/dpkg/lock sudo apt-get -f update sudo dpkg --clear-selections sudo dpkg --configure -a But nothing seems to work. So is there a way to solve this?? Thanks

    Read the article

  • A software to lock regions of a screen to prevent any windows from overlapping

    - by cybervaldez
    I've just installed nexus dock (a similar application like rocketdock), after playing with the preferences i've come across a very curious option (under position & behavior) that says: Prevent maximized windows from overlapping the dock. With it enabled, any application I maximize(and i do mean any) won't overlap the dock, it's really great. So i'm thinking perhaps there's a software that does this kind of feature which is really ideal for keeping my workspace really organized. I really hate repositioning and resizing my windows everytime. Of course there's always the manual way of doing these but it's just too much of a bother when someone from the family uses the computer. Do you know any software that does this? even a software that can just save/remember window positions would also be nice too.

    Read the article

  • How can I print-screen just one window and not my entire desktop?

    - by Michael Durrant
    I could swear I've always been able to do alt-printscreen to get 'just that window' but right now I am getting my entire desktop. Any idea why this would be or what I can do to get my ability to do small window screen shots? I've tried a lot of combination with the ctrl, alt, shift and print-screen keys but no luck, nothing happens in response. One option: shift-ctrl print-screen lets me do a selection using a cross hair to size out the screen capture but I don't know where this gets saved. I'm not being given the choice and it's not in Desktop or Pictures. I use an external keyboard, but I've tried using the laptop's own keyboard and no difference. I am running Ubuntu 12.04 and the laptop is a Samsung Ultrabook 900 Update: I rebooted and it "fixed" it - for now. However this is not the first time I've seen this so I'm still curious as to why it happens, what I can do to fix w/o reboot and if other share the same problem.

    Read the article

  • Figuring out the resource a lock in SQL Server 2000 affects

    - by Michael Lang
    I am adding a simple web-interface to show data from a commercial off the shelf (COTS) application. This COTS issues locks on any record the user is actively looking at (whether they intend to edit and update it or not). I have found sp_lock and the Microsoft sp_lock2 scripts and can see the locks, so that's all well and good. However, I cannot figure out how I can tell if a specific record I am about to update has been affected by one of these locks. If I submit the update request and there is in fact a lock, the web-interface will wait indefinitely until the user closes the window in the COTS. How can I either: a) determine before issuing an update that the record has been locked OR b) issue an update that will immediately return with a LOCKED status rather than indefinitely waiting on the COTS user to close their window on that record?

    Read the article

  • Android font out of view on small screen

    - by user581949
    Hi Everyone I have several text views that take up the majority of the screen in landscape view in a relativelayout and the font size i have set is quite big (150dp). The text views are all timers and the furthest to the right is the "seconds" textview. My problem is that when testing on a phone with a small screen res the seconds are way outside the limit of the screen and can't be seen. They are in perfect place on normal to large screen resolutions just not on a small screen. Is there any way i can force the "seconds" text view to stay on screen, without adjusting the font size or margins between each text view? Even if it means looking cramped on a small screen i can live with that. Any help is greatly appreciated. Thanks This is the corresponding code:

    Read the article

  • Windows 7 Boot Screen Resolution/Aspect Ratio

    - by Joe
    I have been using my Windows 7 PC with my 46" Samsung HDTV with 1920x1080 resolution. The boot screen seems to always be at 1024x768 resolution and the aspect ratio doesn't match the 1080p ratio. I read on a msdn blog that microsoft only made the boot screen in one type of resolution so that cannot be changed. The result is that on my TV the boot screen seems to look stretched out. Is there a way to make change the aspect ratio or crop it in someway? Is there any method at all to make it look normal or just better without being stretchy looking?

    Read the article

  • "No more PTYs" when trying to start screen

    - by Attila Oláh
    When I try to start 'screen' or 'byobu', I get the following error message: $ screen No more PTYs. Sorry, could not find a PTY. [screen is terminating] I seem to have enough though: $ ls /dev/pts $ cat /proc/sys/kernel/pty/nr 0 $ cat /proc/sys/kernel/pty/max 4096 Some more info: $ uname -a Linux cube.mydedi.net 2.6.18-194.8.1.el5.028stab070.5 #1 SMP Fri Sep 17 19:10:36 MSD 2010 x86_64 x86_64 x86_64 GNU/Linux If you need any more info please comment. This is on a low-end VPS, but it used to work just fine, until it stopped working. Everything else seems to be fine though.

    Read the article

  • Black screen on Ubuntu 12.04

    - by user1648371
    I've just upgraded to Ubuntu 12.04 and I'm experiencing some problems. The first thing I noticed is that when I click the Workspace switcher all I get is a black screen (I can guess where the different workspaces are located and clicked on them, not a practical solution though). In addition when I lock the screen or suspend the laptop (a Vaio VPCEB4M1E) I get a shifted screen (I see the right most vertical stripe on the left size of the monitor and nothing about all the rest, to put it clearly I can see the gear that allows me to turn the pc off, etc, but not much more..) when I go to the additional driver menu I see the "ATI/AMD proprietary FGLRX graphics driver" are installed and the post-release update version is available. I don't know if the problem is driver related, so before doing anything I'd like to get some suggestions from you guys. Thanks you!

    Read the article

  • GNU Screen: «unknown command 'vert_split'» though C-a | works

    - by etuardu
    Hi, in GNU-screen (4.00.03jw4 FAU 2-May-06) I'm able to perform a vertical split pressing C-a | (i.e. Ctrl+a, then pipe). Since I'd like to have the screen vertically splitted at the program startup, I put "vert_split" in my .screenrc file, but when I start it I can read «unknown command 'vert_split'» for few seconds in the status bar, and the screen is indeed not splitted. I can't find a solution for this in the manual. Can someone please help me? Thank you.

    Read the article

  • Recommendations for screen-capture tool that retains menus and mouse pointer

    - by Chris Farmer
    There are several screen capture tool questions already on this site, but I think I have a slight tweak to the usual. I'd like a handy screen capture utility that can: Run in Windows 7 Capture a sub-region of the screen Show the current state of the mouse cursor and any active menus I'd like to use it for writing docs that refer to specific application menu items. I like the built-in snipping tool in Windows 7, but the act of using it dismisses my menus, and it doesn't get the mouse cursor either. Do any such tools exist? EDIT: Ahh, I wasn't familiar with the "delayed capture" options of these tools, but they all seem to fit the bill. Thanks!

    Read the article

facebook twitter digg google delicious technorati stumbleupon myspace wordpress linkedin gmail igoogle windows live tumblr viadeo yahoo buzz yahoo mail yahoo bookmarks favorites email print

< Previous Page | 12 13 14 15 16 17 18 19 20 21 22 23  | Next Page >