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• How do I prevent IIS 8 from stopping idle ASP.NET applications?

  - by Lambo Jayapalan

  I have an asp.net application running on Windows 2012 in IIS 8 that has a very time consuming application start process (essentially the code running in the Application_Start() event can take up to 2 minutes). Thus I'd like to minimize the number of times the application is started so that the user can avoid a long wait. I've enabled Preload in the application settings, and I've set the Start Mode to AlwaysRunning in the application pool. Yet the application still ends after not being used for a while, resulting in a very long time for the first visit to the website after the application shuts down. Does anyone have any ideas on how I can prevent this? Thanks

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• deleting old unused images

  - by Ayyash

  As we move on with our content-based websites, lots of images get dumped in our images folder, but we rarely come across self-committed monkyes that delete their files once they do not need it, which means, we end up with a huge list of images in one folder, and it is very tricky to clean it up. My question is (and i dont know if this is the right website to ask it), is there a tool that allows me to find out if an image has been requested by web in the last (n) months? my other general question is, how do you do it? how do you take control of your images folders? what policy do you enforce on developers to clean up? what measures do you take in order to decide what goes and what stays if you end up with an out-of-control situation? my suggestion was to rename the images folder, create a new one, copy the basic ones and wait for someone to complain about a broken image! :) i find this to be the most efficient.

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• Computer is totally crashed

  - by Napster

  my computer kept restarting on its own at random times varying from 1 minutes, to 20 minutes(then goind in a constant restart loop every ~10 seconds). I had to turn it off and wait minutes or hours before attempting to restarting to go further in the boot process. Now, it just does not turn on. I posted this before: Computer crashes every 2 to 10 minutes but I did not have the time to check the temperature. I don't want to pay to get it checked up, but I want to know what is wrong. Is the processor fried? Thank you

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• serving static assets via http is really slow compared to sshfs (apache2/nginx)

  - by s1lv3r

  After migrating to a new VPS I had some users complaining about slow loading images on their sites. After creating some test files with dd I realized that I can download all files via sshfs with full speed while downloads via web are painfully slow. The larger the file is and the longer the transfer takes, the slower the transfer speed gets. I thought I had some problems with Apache and just spend the whole evening with replacing Apache2 against nginx for static file serving - with no effect at all. No I/O wait states in top. Tons of RAM free, no high CPU utilization and hdparm shows a decent I/O performance at all times. I just have no idea anymore, what's happening on this server. This is a link to a demo file: http://master.dealux.de/file.tgz Anybody an idea what I can check out?

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• What is the S.M.A.R.T. page?

  - by Mads Skjern

  I've just listened to Steve Gibson talk about his SpinRite software, on the Security Now podcast episode 336 (transscript). At 33:20 he says: I can show and do show on the SMART page that sectors are being relocated and that errors are being corrected. That SMART analysis page sometimes scares people because it shows, wait a minute, this thing says we're correcting so many errors per megabyte. What is this SMART page? 1) Some information saved on the HD by SMART, that I can access with a SMART tool like smartmontools? 2) A page (tab) in his SpinRite software? In any case, can I see, in any way, what sectors are marked as bad, without using SpinRite? Preferably using smartmontools!

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• Amazon EC2 pem file stopped working suddenly

  - by Jashwant

  I was connecting to Amazon EC2 through SSH and it was working well. But all of a sudden, it stopped working. I am not able to connect anymore with the same key file. What can go wrong ? Here's the debug info. ssh -vvv -i ~/Downloads/mykey.pem [email protected] OpenSSH_6.1p1 Debian-4, OpenSSL 1.0.1c 10 May 2012 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug2: ssh_connect: needpriv 0 debug1: Connecting to ec2-54-222-60-78.eu.compute.amazonaws.com [54.229.60.78] port 22. debug1: Connection established. debug3: Incorrect RSA1 identifier debug3: Could not load "/home/jashwant/Downloads/mykey.pem" as a RSA1 public key debug1: identity file /home/jashwant/Downloads/mykey.pem type -1 debug1: identity file /home/jashwant/Downloads/mykey.pem-cert type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1.1 debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1.1 pat OpenSSH_5* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.1p1 Debian-4 debug2: fd 3 setting O_NONBLOCK debug3: load_hostkeys: loading entries for host "ec2-54-222-60-78.eu.compute.amazonaws.com" from file "/home/jashwant/.ssh/known_hosts" debug3: load_hostkeys: found key type ECDSA in file /home/jashwant/.ssh/known_hosts:4 debug3: load_hostkeys: loaded 1 keys debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug2: kex_parse_kexinit: ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],[email protected],[email protected],ssh-rsa,ssh-dss debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected] debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected] debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: none,[email protected],zlib debug2: kex_parse_kexinit: none,[email protected],zlib debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: kex_parse_kexinit: ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1 debug2: kex_parse_kexinit: ssh-rsa,ssh-dss,ecdsa-sha2-nistp256 debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected] debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected] debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96 debug2: kex_parse_kexinit: none,[email protected] debug2: kex_parse_kexinit: none,[email protected] debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: debug2: kex_parse_kexinit: first_kex_follows 0 debug2: kex_parse_kexinit: reserved 0 debug2: mac_setup: found hmac-md5 debug1: kex: server->client aes128-ctr hmac-md5 none debug2: mac_setup: found hmac-md5 debug1: kex: client->server aes128-ctr hmac-md5 none debug1: sending SSH2_MSG_KEX_ECDH_INIT debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug1: Server host key: ECDSA d8:05:8e:fe:37:2d:1e:2c:f1:27:c2:e7:90:7f:45:48 debug3: load_hostkeys: loading entries for host "ec2-54-222-60-78.eu.compute.amazonaws.com" from file "/home/jashwant/.ssh/known_hosts" debug3: load_hostkeys: found key type ECDSA in file /home/jashwant/.ssh/known_hosts:4 debug3: load_hostkeys: loaded 1 keys debug3: load_hostkeys: loading entries for host "54.229.60.78" from file "/home/jashwant/.ssh/known_hosts" debug3: load_hostkeys: found key type ECDSA in file /home/jashwant/.ssh/known_hosts:5 debug3: load_hostkeys: loaded 1 keys debug1: Host 'ec2-54-222-60-78.eu.compute.amazonaws.com' is known and matches the ECDSA host key. debug1: Found key in /home/jashwant/.ssh/known_hosts:4 debug1: ssh_ecdsa_verify: signature correct debug2: kex_derive_keys debug2: set_newkeys: mode 1 debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug2: set_newkeys: mode 0 debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug2: key: jashwant@jashwant-linux (0x7f827cbe4f00) debug2: key: /home/jashwant/Downloads/mykey.pem ((nil)) debug1: Authentications that can continue: publickey debug3: start over, passed a different list publickey debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password debug3: authmethod_lookup publickey debug3: remaining preferred: keyboard-interactive,password debug3: authmethod_is_enabled publickey debug1: Next authentication method: publickey debug1: Offering RSA public key: jashwant@jashwant-linux debug3: send_pubkey_test debug2: we sent a publickey packet, wait for reply debug1: Authentications that can continue: publickey debug1: Trying private key: /home/jashwant/Downloads/mykey.pem debug1: read PEM private key done: type RSA debug3: sign_and_send_pubkey: RSA 9b:7d:9f:2e:7a:ef:51:a2:4e:fb:0c:c0:e8:d4:66:12 debug2: we sent a publickey packet, wait for reply debug1: Authentications that can continue: publickey debug2: we did not send a packet, disable method debug1: No more authentication methods to try. Permission denied (publickey). I've already googled everything and checked : Public DNS is same (It hasnt changed), Username is ubuntu as it's a Ubuntu AMI ( Used the same earlier), Permission is 400 on mykey.pem file ssh port is enabled via security groups ( Used the same ealier )

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• Which Linux book for aspiring sysadmin?

  - by Ramy

  I have a co-worker who insists that he will never buy a book unless it is considered "THE" book. So, in this vein, I thought I'd ask what the ultimate Linux book is. I wouldn't quite call myself a complete beginner since I can get around in Linux in general pretty well. But, beyond that, I'm also looking for a book with an eye towards becoming a Sys Admin someday. I saw a Junior Sys Admin position open up recently but with the requisite 2-3 years experience, I may have to wait a little while longer before I'm ready to apply for such a position. Having said all that, I'll summarize my question: What is the ultimate Linux book for someone who is ok with the basic tasks of getting around in Linux but also wants to aim towards full Sys Admin status someday? A few examples of the books I'm considering: Linux-Administration-Beginners-Guide-Fifth Linux-System-Administration Linux-System-Administration EDIT: Before you close this question as a dup, I'd like to say that I'm looking for something that goes deeper than this: Book for linux newbies I already have "Linux in a nutshell"

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• File Saving Sometimes Fails

  - by YellPika

  When I attempt to save files, it sometimes (randomly) fails. In Blender, I sometimes get "Version Backup Failed: File Saved With @". In Visual Studio, building sometimes fails with an error message indicating that the target file/exe cannot be overwritten. If I wait a bit, I can save fine. It's almost as if programs are taking an abnormal amount of time to 'let go' of the files. What could be causing this behaviour? This seems to be caused by Windows Live Mesh monitoring my files, and locking them whenever it uploads the new versions (BAD considering the amount of times I save my files, even redundantly). Any suggestions to work around this behaviour? Should I switch to a better service to sync my files?

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• Rebuilding /etc/rc?.d/ links

  - by timday

  A regular filesystem check on a Debian Lenny system triggered an fsck, and that nuked a handful of links in the /etc/rc?.d hierarchy (unfortunately I didn't keep a list). The system seems to boot and run normally, but I'm worried its storing up trouble for the future. Is there an easy (fairly automatic) way of rebuilding this piece of the system ? As I understand it, the links are generally manipulated by package postinst scripts using update-rc.d (and I haven't made any changes from the installed defaults). Without any better ideas, my plan is one of: Diff a listing with another similar system to identify which packages need their links repairing. Wait until the system is upgraded to Squeeze (hopefully not too long :^) and assume the mass package upgrade will restore all the missing links.

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• mini linux for browsing media playing

  - by Martin Beckett

  I'm looking for a small linux install (<100Mb) that can just run a browser and ideally a media player. It's to fit in a spare recovery partition on my laptop and be a quick boot for non-work stuff when I'm on the road. I have used Puppy-linux and DSL before but they have lots of stuff I don't need. Is there something like these that just concentrates on running a browser in the way xbmc does for videos? ps. The size requirement was to fit in the existing 100Mb win7 recovery partition, but that can be resized. The main idea was something that booted very quickly without the 10min wait while windows does all the corporate stuff and realizes it isn't on the LAN - and could be shutdown instantly.

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• bash process uses 90% CPU, comes back on computer restart

  - by Sano

  I’ve replaced the old HDD of my late 2008 unibody MacBook (8 GB of RAM, running OS X 10.7.4) with an OCZ Vertex 3 SSD. After doing this, I've installed Lion and restored my data from a Time Machine backup. Everything is fine, except for a process named “bash” that permanently uses about 90 % CPU. If I kill it via Activity Monitor, everything goes back to normal, but unfortunately the process comes back every time I restart the computer. I've tried do zap the PRAM, reinstall 10.7.4 from the combo package, and even simply wait for more than 2 hours, but the problem is still here.

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• Ways to polling server status

  - by Yijinsei

  Hi guys, I create the same question is stackoverflow, but I was recommended to post my question here. So I apologies for those who saw this post twice. I am try to create a JSP page that will show all the status in a group of local servers. Currently I create a schedule class that will constantly poll to check the status of the server with 30 second interval, with 5 second delay to wait for each server reply, and provide the JSP page with the information. However I find this way to be not accurate as it will take some time before the information of the schedule class to be updated. Do you guys have a better way to check the status of several server within a local network?

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• Java script Gallery - how to show a next image with an arrow - shiftImg(1)

  - by Srikanth Naidu

  //html file Image slideshow </script>   Loading image. Please wait 1     1/12 2/12 3/12 4/12 5/12 6/12 7/12 8/12   // //JS File var displayWaitMessage=true; // Display a please wait message while images are loading? var activeImage = false; var imageGalleryLeftPos = false; var imageGalleryWidth = false; var imageGalleryObj = false; var maxGalleryXPos = false; var slideSpeed = 0; var imageGalleryCaptions = new Array(); function startSlide(e) { if(document.all)e = event; var id = this.id; this.getElementsByTagName('IMG')[0].src = 'images/' + this.id + '_over.gif'; if(this.id=='arrow_right'){ slideSpeedMultiply = Math.floor((e.clientX - this.offsetLeft) / 5); slideSpeed = -1*slideSpeedMultiply; slideSpeed = Math.max(-10,slideSpeed); }else{ slideSpeedMultiply = 10 - Math.floor((e.clientX - this.offsetLeft) / 5); slideSpeed = 1*slideSpeedMultiply; slideSpeed = Math.min(10,slideSpeed); if(slideSpeed<0)slideSpeed=10; } } function releaseSlide() { var id = this.id; this.getElementsByTagName('IMG')[0].src = 'images/' + this.id + '.gif'; slideSpeed=0; } function gallerySlide() { if(slideSpeed!=0){ var leftPos = imageGalleryObj.offsetLeft; leftPos = leftPos/1 + slideSpeed; if(leftPos>maxGalleryXPos){ leftPos = maxGalleryXPos; slideSpeed = 0; } if(leftPos<minGalleryXPos){ leftPos = minGalleryXPos; slideSpeed=0; } imageGalleryObj.style.left = leftPos + 'px'; } setTimeout('gallerySlide()',20); } function showImage() { if(activeImage){ activeImage.style.filter = 'alpha(opacity=50)'; activeImage.style.opacity = 0.5; } this.style.filter = 'alpha(opacity=100)'; this.style.opacity = 1; activeImage = this; } function initSlideShow() { document.getElementById('arrow_left').onmousemove = startSlide; document.getElementById('arrow_left').onmouseout = releaseSlide; document.getElementById('arrow_right').onmousemove = startSlide; document.getElementById('arrow_right').onmouseout = releaseSlide; imageGalleryObj = document.getElementById('theImages'); imageGalleryLeftPos = imageGalleryObj.offsetLeft; imageGalleryWidth = document.getElementById('galleryContainer').offsetWidth - 80; maxGalleryXPos = imageGalleryObj.offsetLeft; minGalleryXPos = imageGalleryWidth - document.getElementById('slideEnd').offsetLeft; var slideshowImages = imageGalleryObj.getElementsByTagName('IMG'); for(var no=0;no<slideshowImages.length;no++){ slideshowImages[no].onmouseover = showImage; } var divs = imageGalleryObj.getElementsByTagName('DIV'); for(var no=0;no<divs.length;no++){ if(divs[no].className=='imageCaption')imageGalleryCaptions[imageGalleryCaptions.length] = divs[no].innerHTML; } gallerySlide(); } function showPreview(imagePath,imageIndex){ var subImages = document.getElementById('previewPane').getElementsByTagName('IMG'); if(subImages.length==0){ var img = document.createElement('IMG'); document.getElementById('previewPane').appendChild(img); }else img = subImages[0]; if(displayWaitMessage){ document.getElementById('waitMessage').style.display='inline'; } document.getElementById('largeImageCaption').style.display='none'; img.onload = function() { hideWaitMessageAndShowCaption(imageIndex-1); }; img.src = imagePath; } function hideWaitMessageAndShowCaption(imageIndex) { document.getElementById('waitMessage').style.display='none'; document.getElementById('largeImageCaption').innerHTML = imageGalleryCaptions[imageIndex]; document.getElementById('largeImageCaption').style.display='block'; } function shiftImg(imageIndex){ } window.onload = initSlideShow;

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• Can someone explain the "use-cases" for the default munin graphs?

  - by exhuma

  When installing munin, it activates a default set of plugins (at least on ubuntu). Alternatively, you can simply run munin-node-configure to figure out which plugins are supported on your system. Most of these plugins plot straight-forward data. My question is not to explain the nature of the data (well... maybe for some) but what is it that you look for in these graphs? It is easy to install munin and see fancy graphs. But having the graphs and not being able to "read" them renders them totally useless. I am going to list standard plugins which are enabled by default on my system. So it's going to be a long list. For completeness, I am also going to list plugins which I think to understand and give a short explanation as to what I think it's used for. Pleas correct if I am wrong with any of them. So let me split this questions in three parts: Plugins where I don't even understand the data Plugins where I understand the data but don't know what I should look out for Plugins which I think to understand Plugins where I don't even understand the data These may contain questions that are not necessarily aimed at munin alone. Not understanding the data usually mean a gap in fundamental knowledge on operating systems/hardware.... ;) Feel free to respond with a "giyf" answer. These are plugins where I can only guess what's going on... I hardly want to look at these "guessing"... Disk IOs per device (IOs/second)What's an IO. I know it stands for input/output. But that's as far as it goes. Disk latency per device (Average IO wait)Not a clue what an "IO wait" is... IO Service TimeThis one is a huge mess, and it's near impossible to see something in the graph at all. Plugins where I understand the data but don't know what I should look out for IOStat (blocks/second read/written)I assume, the thing to look out for in here are spikes? Which would mean that the device is in heavy use? Available entropy (bytes)I assume that this is important for random number generation? Why would I graph this? So far the value has always been near constant. VMStat (running/I/O sleep processes)What's the difference between this one and the "processes" graph? Both show running/sleeping processes, whereas the "Processes" graph seems to have more details. Disk throughput per device (bytes/second read/written) What's thedifference between this one and the "IOStat" graph? inode table usageWhat should I look for in this graph? Plugins which I think to understand I'll be guessing some things here... correct me if I am wrong. Disk usage in percent (percent)How much disk space is used/remaining. As this is approaching 100%, you should consider cleaning up or extend the partition. This is extremely important for the root partition. Firewall Throughput (packets/second)The number of packets passing through the firewall. If this is spiking for a longer period of time, it could be a sign of a DOS attack (or we are simply recieving a large file). It can also give you an idea about your firewall performance. If it's levelling out and you need more "power" you should consider load balancing. If it's levelling out and see a correlation with your CPU load, it could also mean that your hardware is not fast enough. Correlations with disk usage could point to excessive LOG targets in you FW config. eth0 errors (packets in/out)Network errors. If this value is increasing, it could be a sign of faulty hardware. eth0 traffic (bits/second in/out)Raw network traffic. This should correlate with Firewall throughput. number of threadsAn ever-increasing value might point to a process not properly closing threads. Investigate! processesBreakdown of active processes (including sleeping). A quick spike in here might point to a fork-bomb. A slowly, but ever-increasing value might point to an application spawning sub-processes but not properly closing them. Investigate using ps faux. process priorityThis shows the distribution of process priorities. Having only high-priority processes is not of much use. Consider de-prioritizing some. cpu usageFairly straight-forward. If this is spiking, you may have an attack going on, or a process is hogging the CPU. Idf it's slowly increasing and approaching max in normal operations, you should consider upgrading your hardware (or load-balancing). file table usageNumber of actively open files. If this is reaching max, you may have a process opening, but not properly releasing files. load averageShows an summarized value for the system load. Should correlate with CPU usage. Increasing values can come from a number of sources. Look for correlations with other graphs. memory usageA graphical representation of you memory. As long as you have a lot of unused+cache+buffers you are fine. swap in/outShows the activity on your swap partition. This should always be 0. If you see activity on this, you should add more memory to your machine!

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• Windows Server 2008 hangs up while booting

  - by Jim R

  Windows Server 2008 hangs up while booting after Windows update applied several updates. The server is a virtual instance on a Server 2008 Hyper-V host. Other virtual servers are fine, but have not been updated. The normal boot shows the horizontal barber poll forever. When I do a safe boot it also hangs up. With a "Please Wait..." after loading many '.sys' files. The last successfully loaded file listed is: '\Windows\system32\drivers\crcdisk.sys' That is the extent of what I have been able to determine.

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• Using boost locks for RAII access to a semaphore

  - by dan

  Suppose I write a C++ semaphore class with an interface that models the boost Lockable concept (i.e. lock(); unlock(); try_lock(); etc.). Is it safe/recommended to use boost locks for RAII access to such an object? In other words, do boost locks (and/or other related parts of the boost thread library) assume that the Lockable concept will only be modeled by mutex-like objects which are locked and unlocked from the same thread? My guess is that it should be OK to use a semaphore as a model for Lockable. I've browsed through some of the boost source and it "seems" OK. The locks don't appear to store explicit references to this_thread or anything like that. Moreover, the Lockable concept doesn't have any function like whichThreadOwnsMe(). It also looks like I should even be able to pass a boost::unique_lock<MySemaphore> reference to boost::condition_variable_any::wait. However, the documentation is not explicitly clear about the requirements. To illustrate what I mean, consider a bare-bones binary semaphore class along these lines: class MySemaphore{ bool locked; boost::mutex mx; boost::condition_variable cv; public: void lock(){ boost::unique_lock<boost::mutex> lck(mx); while(locked) cv.wait(lck); locked=true; } void unlock(){ { boost::lock_guard<boost::mutex> lck(mx); if(!locked) error(); locked=false; } cv.notify_one(); } // bool try_lock(); void error(); etc. } Now suppose that somewhere, either on an object or globally, I have MySemaphore sem; I want to lock and unlock it using RAII. Also I want to be able to "pass" ownership of the lock from one thread to another. For example, in one thread I execute void doTask() { boost::unique_lock<MySemaphore> lock(sem); doSomeWorkWithSharedObject(); signalToSecondThread(); waitForSignalAck(); lock.release(); } While another thread is executing something like { waitForSignalFromFirstThread(); ackSignal(); boost::unique_lock<MySemaphore>(sem,boost::adopt_lock_t()); doMoreWorkWithSameSharedObject(); } The reason I am doing this is that I don't want anyone else to be able to get the lock on sem in between the time that the first thread executes doSomeWorkWithSharedObject() and the time the second executes doMoreWorkWithSameSharedObject(). Basically, I'm splitting one task into two parts. And the reason I'm splitting the task up is because (1) I want the first part of the task to get started as soon as possible, (2) I want to guarantee that the first part is complete before doTask() returns, and (3) I want the second, more time-consuming part of the task to be completed by another thread, possibly chosen from a pool of slave threads that are waiting around to finish tasks that have been started by master threads. NOTE: I recently posted this same question (sort of) here http://stackoverflow.com/questions/2754884/unlocking-a-mutex-from-a-different-thread-c but I confused mutexes with semaphores, and so the question about using boost locks didn't really get addressed.

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• router w/ WOL out-of-the-box, or is known to work with open firmware

  - by Jaroslav Záruba

  I'm looking for a new WiFi router, and one key feature for me is WOL. Seems like many routers won't do this w/ factory firmware. Given my last router (Asus WL-520g) turned into a disco-brick couple hours after flashed to dd-wrt I'd prefer if the new one supported WOL out-of-the-box. other required features would be: dyndns service support port forwarding sometimes it is called "virtual server" I guess NAT loopback so I can access services running in my own network using dyndns hostname or public IP w/o getting too old (for example DIR-615 with factory firmware lets you wait literally minutes) did I mention WiFi? preferably w/ some range extending technology, if such stuff works at all

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• ADFS 2.0 Farm - How do I perform an immediate sync

  - by Matt

  Hi, We're using ADFS 2.0 on a windows 2008 server, it's in a farm and has the default polling interval of 5 minutes. We're making a change tonight and would rather sync immediately than wait for the other guy to update, especially as we might be making multiple changes. This Technet article mentions that I can change the polling interval or do an immediate sync between my servers: http://technet.microsoft.com/en-us/library/ee913581%28WS.10%29.aspx I checked the powershell commandlets for ADFS and I can only seem to find one that let's me set the polling interval, but not perform a 1 time immediate sync Searched the usual suspects, but just can't find a ADFS-SyncMyStuffNow command... Anyone?

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• [C++] Producer/Consumer Implementation -- Feedback Wanted

  - by bobber205

  I'm preparing for an interview in a few weeks and I thougth I would give threads in boost a go, as well as do the simple producer/consumer problem I learned in school. Haven't done it quite awhile so I was curious what you guys think of this? What should I add to make it a better example etc. Thanks for the feedback! :) ////////////////////////////////////////////////////////////////////////// boost::mutex bufferMutex; deque<int> buffer; const int maxBufferSize = 5; ////////////////////////////////////////////////////////////////////////// bool AddToBuffer(int i) { if (buffer.size() < maxBufferSize) { buffer.push_back(i); return true; } else { return false; } } bool GetFromBuffer(int& toReturn) { if (buffer.size() == 0) { return false; } else { toReturn = buffer[buffer.size()-1]; buffer.pop_back(); return true; } } struct Producer { int ID; void operator()() { while (true) { boost::mutex::scoped_lock lock(bufferMutex); int num = dice(); bool result = AddToBuffer(num); lock.unlock(); //safe area done if (result) { cout << "Producer " << this->ID << " Added " << num << endl; } else { cout << "!!Buffer was Full!!" << endl; } //Added //Now wait boost::xtime xt; xtime_get( &xt, boost::TIME_UTC); xt.nsec += 1000000 + 100000 * (rand() % 1000); boost::thread::sleep(xt); } } }; struct Consumer { int ID; void operator()() { while (true) { int returnedInt = 0; boost::mutex::scoped_lock lock(bufferMutex); bool result = GetFromBuffer(returnedInt); lock.unlock(); //safe area done if (result) { cout << "\tConsumer " << this->ID << " Took Out " << returnedInt << endl; } else { cout << "!!Buffer was Empty!!" << endl; } //Added //Now wait boost::xtime xt; xtime_get( &xt, boost::TIME_UTC); xt.nsec += 1000000 + 100000 * (rand() % 1000); boost::thread::sleep(xt); } } }; void main() { Producer p, p2; Consumer c, c2; p.ID = 1; p2.ID = 2; c.ID = 1; c2.ID = 2; boost::thread thread1(boost::ref(p)); boost::thread thread2(boost::ref(c)); boost::thread thread3(boost::ref(p2)); boost::thread thread4(boost::ref(c2)); int x; cin >> x; }

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• How to clear stuck locked maildrop pop3 process

  - by Joshua

  I am using cyrus for imap and pop One of my users is getting the following error: Unable to lock maildrop : Mailbox is locked by POP server. I can see where it starts in the log. I've read that there is no physical lock file anymore (i've tried looking for it anyways) and that the solution is to just wait for the timeout, or kill the offending pop3 process. I know that this is happening because of a lossy connection on the part of the affected user, and that pop3 can only have 1 session active at a time. I need to manually clear the lock and I am having trouble finding the offending pop process. I have tried lsof, but it doesn't say how long the individual files (sockets) have been opened for. I've reduced the tcp keepalive time down to 5 mins, but I still need to reset this guy's lock. I could use some pointers. Thanks!

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• How to recover from a drive failure in a RAID 5 configuration?

  - by Philip Fourie

  This morning a drive failed on our database server. The drive array (3 disks) is setup in a RAID 5 configuration. While we wait for a drive replacement we are preparing for a recovery strategy. Users are continuing to work on the system, albeit very slowly (don't know why??). How does one install the new drive - will the data for this drive automatically be rebuilt from the parity or is there another process we should follow? Edit: This is a hardware RAID controller. (Thanks for the answers so far, appreciated)

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• Can't connect to VPN in Windows XP mode

  - by darkstar13

  I have Windows 7 x32 installed on my laptop. I have also Windows XP mode installed. My setup is that my work-remote programs are in Windows XP mode because my VPN installer in Windows XP only. Lately, I have been having troubles getting on / logging in to VPN. I can access the internet in WinXP mode but When I ping the IP address of the target IP of my VPN network (or even just Google.com), I always get a 'Request Timeout'. However, when I ping the same IP address in command prompt in Windows 7, I get 100% data sent. Is there anything I need to adjust? Before, I have been able to connect instantly. Now, it's like trial and error, or I will have to wait for hours just to be able to enter logon credentials in Cisco VPN dialer. NAT is my network adapter in XP mode.

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• Dismissing systray balloons with the keyboard?

  - by rangerchris

  This is probably a supplementary question to how to access the systray using the keyboard... I've read that, and done some googling (google fu lacking, or there really is no answer), but I can't find a nice quick keyboard shortcut to dismiss those info balloons that apps in the system tray choose to display every now and then. The hints for access in the linked question can't be used to close the balloon (and least when I've tried them here). Now I know I can wait for a timeout and they'll go away but if I can just hit , that'd be fanstastic. So... anyone aware of a keyboard shortcut?

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• External optical drive won't plug 'n play...sometimes.

  - by Connor

  alright, I've looked a lot of different ways, but here goes. i have an external DVD burner that connects via USB and should be plug 'n play however sometimes when I connect it a message pops up requesting any CD or installation software it came with. It didn't come with any though. The confusing part is that if I wait a couple weeks and plug it in, then it works fine, but if I turn it off and back on the problem arises again. I've tried different computers, same problem. There's little to no customer support from the company, Ativa, and no drivers for the product. I'm hoping there's a registry trick for this. any help?

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• Windows 7, file properties, date modified, how do you show seconds?

  - by Jordan Weinstein

  Anyone know a way to immediately show the seconds of a file's date modified property in the GUI? So if you create a file, any file in any directory, right-click and choose Properties, the date modified (if it's recent) will say something like "dd/mm/yyy hh:mm, one minute ago" - reminder this is in Windows 7. Windows XP did it normally. Then they changed something. If you wait a while, eventually you'll see the seconds, I'm not sure how long a while is, but this is incredibly annoying if you want to troubleshoot something that relies on the seconds of timestamps... is there a setting? registry key I can change perhaps? I'm literally using Chrome, pasting in the path of the directory to be able to see the seconds quickly (as a workaround) but would be nice to be able to use Win7.

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