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  • Linux library that handles both GUI/textual mode user interfaces

    Hello, I am looking for some Linux library/programming language that can be used on a variety of Linux platforms and can operate in both textual and GUI mode interfaces. For example YCP (the Yast programming language) will display in GUI if in Gnome/KDE environment and run in text/ncurses mode when display is not available. The problem is that YCP is SUSE specific. Any ideas will be appreciated!

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  • Is this safe on a production server?

    - by Camran
    I have a database application (or search engine) which is called Solr. I connect to it via port 8983. I do this from php code, so I add and remove records from it via php. On my server I have a firewall. I have set this firewall to only allow connections to and from this port (8983) from the ip adress of my own server. In other words, only allow servers IP to access this port. Is that safe? Or am I thinking all wrong here? Will others be able to "simulate" my ip adress and act as the server? This is because otherwise others may add/remove records as they want from their own ip adresses... Thanks

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  • Is It Safe to Cast Away volatile?

    - by Yan Cheng CHEOK
    Most of the time, I am doing this way. class a { public: ~ a() { i = 100; // OK delete (int *)j; // Compiler happy. But, is it safe? // Error : delete j; } private: volatile int i; volatile int *j; }; int main() { a aa; } However, I saw an article here: https://www.securecoding.cert.org/confluence/display/seccode/EXP32-C.+Do+not+access+a+volatile+object+through+a+non-volatile+reference Casting away volatile allows access to an object through a non-volatile reference. This can result in undefined and perhaps unintended program behavior. So, what will be the workaround for my above code example?

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  • How can CopyOnWriteArrayList be thread-safe?

    - by Shooshpanchick
    I've taken a look into OpenJDK's sources of CopyOnWriteArrayList and it seems that all write operations are protected by the same lock and read operations are not protected at all. As I understand, under JMM all accesses to a variable (both read and write) should be protected by lock or reordering effects may occur. For example, set(int, E) method contains these lines (under lock): /* 1 */ int len = elements.length; /* 2 */ Object[] newElements = Arrays.copyOf(elements, len); /* 3 */ newElements[index] = element; /* 4 */ setArray(newElements); The get(int) method, on the other hand, only does return get(getArray(), index);. In my understanding of JMM, this means that get may observe the array in an inconsistent state if statements 1-4 are reordered like 1-2(new)-4-2(copyOf)-3. Do I understand JMM incorrectly or is there any other explanations on why CopyOnWriteArrayList is thread-safe?

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  • Will this make the object thread-safe?

    - by sharptooth
    I have a native Visual C++ COM object and I need to make it completely thread-safe to be able to legally mark it as "free-threaded" in th system registry. Specifically I need to make sure that no more than one thread ever accesses any member variable of the object simultaneously. The catch is I'm almost sure that no sane consumer of my COM object will ever try to simultaneously use the object from more than one thread. So I want the solution as simple as possible as long as it meets the requirement above. Here's what I came up with. I add a mutex or critical section as a member variable of the object. Every COM-exposed method will acquire the mutex/section at the beginning and release before returning control. I understand that this solution doesn't provide fine-grained access and this might slow execution down, but since I suppose simultaneous access will not really occur I don't care of this. Will this solution suffice? Is there a simpler solution?

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  • Thread-safe use of a singleton's members

    - by Anthony Mastrean
    I have a C# singleton class that multiple classes use. Is access through Instance to the Toggle() method thread-safe? If yes, by what assumptions, rules, etc. If no, why and how can I fix it? public class MyClass { private static readonly MyClass instance = new MyClass(); public static MyClass Instance { get { return instance; } } private int value = 0; public int Toggle() { if(value == 0) { value = 1; } else if(value == 1) { value = 0; } return value; } }

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  • application is crashing while user exits from fullscreen mode in mpmovieplayer

    - by ravoorinandan
    hi folks we do have a video file in our application,every thing is going fine except one,i.e the application crashes when user exits from fullscreen mode while the movie is playing and also when we pause the movie in fullscreen mode and minimize it,the video starts from the beginning i tried searching whether there is any notification available to notify but of no use plz help me out.thx in advance.

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  • Is there a pure HTML5 emacs mode?

    - by Marcelo Santos
    Question http://stackoverflow.com/questions/1082474/authoring-html5-in-emacs talks about nxml-mode but, from what I read, that can only be used for XHTML5, I want to use emacs with HTML5 (no XML syntax). Is there any mode with auto-indentation, tag/attribute completion, etc.?

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  • Simple C++ container class that is thread-safe for writing

    - by conradlee
    I am writing a multi-threaded program using OpenMP in C++. At one point my program forks into many threads, each of which need to add "jobs" to some container that keeps track of all added jobs. Each job can just be a pointer to some object. Basically, I just need the add pointers to some container from several threads at the same time. Is there a simple solution that performs well? After some googling, I found that STL containers are not thread-safe. Some stackoverflow threads address this question, but none that forms a consensus on a simple solution.

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  • [C++] Needed: A simple C++ container (stack, linked list) that is thread-safe for writing

    - by conradlee
    I am writing a multi-threaded program using OpenMP in C++. At one point my program forks into many threads, each of which need to add "jobs" to some container that keeps track of all added jobs. Each job can just be a pointer to some object. Basically, I just need the add pointers to some container from several threads at the same time. Is there a simple solution that performs well? After some googling, I found that STL containers are not thread-safe. Some stackoverflow threads address this question, but none form a consensus on a simple solution.

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  • Another thread safe queue implementation

    - by jensph
    I have a class, Queue, that I tried to make thread safe. It has these three member variables: std::queue<T> m_queue; pthread_mutex_t m_mutex; pthread_cond_t m_condition; and a push and pop implemented as: template<class T> void Queue<T>::push(T value) { pthread_mutex_lock( &m_mutex ); m_queue.push(value); if( !m_queue.empty() ) { pthread_cond_signal( &m_condition ); } pthread_mutex_unlock( &m_mutex ); } template<class T> bool Queue<T>::pop(T& value, bool block) { bool rtn = false; pthread_mutex_lock( &m_mutex ); if( block ) { while( m_queue.empty() ) { pthread_cond_wait( &m_condition, &m_mutex ); } } if( !m_queue.empty() ) { value = m_queue.front(); m_queue.pop(); rtn = true; } pthread_mutex_unlock( &m_mutex ); return rtn; } Unfortunately there are occasional issues that may be the fault of this code. That is, there are two threads and sometimes thread 1 never comes out of push() and at other times thread 2 never comes out of pop() (the block parameter is true) though the queue isn't empty. I understand there are other implementations available, but I'd like to try to fix this code, if needed. Anyone see any issues? The constructor has the appropriate initializations: Queue() { pthread_mutex_init( &mMutex, NULL ); pthread_cond_init( &mCondition, NULL ); } and the destructor, the corresponding 'destroy' calls.

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  • Is putting $_GET in headers safe? (PHP)

    - by ggfan
    In my profile.php script, I have a flag function that allows users to flag that user. If they flag a user, it sends data (user_id, reason, etc) to a file called flag.php which does all the banning and stuff. The data is sent to flag.php through header("Location: flag.php?user_id=___&reason=___") Then in flag.php, after it does all the banning, it redirects the user back to the profile through another header. The user never sees the flag.php. Is my flag.php safe? because they never see the script?

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  • javascript : make a new safe class constructor

    - by guilin ??
    sometimes we loss the new keyword when define new object, obj = new Clazz(); //correct obj = Clazz(); //wrong, but no syntax error, hard to debug. I want to write a function to help me create Class and make it new safe. var Class = function(constructor){ //when constructor // if not call by new return new constructor(); // else constructor(); } var MyClazz = Class(function(name){ this.name = name }, SuperClazz1, SuperClass2 ) MyClazz.extend({ show: function(){console.log(this.name)} }) obj1 = new MyClazz(); obj2 = MyClazz(); // obj1 should same as obj2 Is it possible, any exists module?

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  • [Android] Is disabling landscape mode unforgivable?

    - by Nicolas Raoul
    Our application could support landscape mode without any problem, but it is such a pain that we are thinking about forcing portrait mode. Question: Is it BAD? The main problem is that changing orientation generates random crashes on many screens. Avoiding those crashes would potentially allow us to spend more time on the core aspects of the app. Will the same crashes happen when users switch apps anyway? Also, are there landscape-oriented devices where our app will become useless?

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  • Optimal strategy to make a C++ hash table, thread safe

    - by Ajeet
    (I am interested in design of implementation NOT a readymade construct that will do it all.) Suppose we have a class HashTable (not hash-map implemented as a tree but hash-table) and say there are eight threads. Suppose read to write ratio is about 100:1 or even better 1000:1. Case A) Only one thread is a writer and others including writer can read from HashTable(they may simply iterate over entire hash table) Case B) All threads are identical and all could read/write. Can someone suggest best strategy to make the class thread safe with following consideration 1. Top priority to least lock contention 2. Second priority to least number of locks My understanding so far is thus : One BIG reader-writer lock(semaphore). Specialize the semaphore so that there could be eight instances writer-resource for case B, where each each writer resource locks one row(or range for that matter). (so i guess 1+8 mutexes) Please let me know if I am thinking on the correct line, and how could we improve on this solution.

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  • Is this method thread safe?

    - by user
    Are these methods getNewId() & fetchIdsInReserve() thread safe ? public final class IdManager { private static final int NO_OF_USERIDS_TO_KEEP_IN_RESERVE = 200; private static final AtomicInteger regstrdUserIdsCount_Cached = new AtomicInteger(100); private static int noOfUserIdsInReserveCurrently = 0; public static int getNewId(){ synchronized(IdManager.class){ if (noOfUserIdsInReserveCurrently <= 20) fetchIdsInReserve(); noOfUserIdsInReserveCurrently--; } return regstrdUserIdsCount_Cached.incrementAndGet(); } private static synchronized void fetchIdsInReserve(){ int reservedInDBTill = DBCountersReader.readCounterFromDB(....); // read column from DB if (noOfUserIdsInReserveCurrently + regstrdUserIdsCount_Cached.get() != reservedInDBTill) throw new Exception("Unreserved ids alloted by app before reserving from DB"); if (DBUpdater.incrementCounter(....)) //if write back to DB is successful noOfUserIdsInReserveCurrently += NO_OF_USERIDS_TO_KEEP_IN_RESERVE; } }

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  • Override <customErrors mode="Off"/> message from .NET Framework even when in web.config detailed err

    - by GrZeCh
    Hello, is this possible to override .NET Framework error: Server Error in '/' Application. Runtime Error Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine. ... <!-- Web.Config Configuration File --> <configuration> <system.web> <customErrors mode="Off"/> </system.web> </configuration> even if web.config (IIS7.5) is set to <httpErrors errorMode="Detailed"/> ? I'm asking because my default setting for IIS7 is <deployment retail="true" /> so no error is being showed and only adding additional error handling module to website will allow to see errors generated by this application and thats why I want to override this message to inform users about it. Any ideas? Thanks

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  • Postfix won't run while selinux in enforcing mode

    - by Dina Abu-khader
    I enabled selinux forcing mode on Fedora 15 , and I was able to get apache, mysql and memcached to work fine , but I couldn't get postfix to run . I got the following errors : systemd[1]: Unit postfix.service entered failed state. kernel: [146194.117602] type=1400 audit(1318924444.361:3809): avc: denied { module_request } for pid=15447 comm="postfix" kmod="net-pf-10" scontext=system_u:system_r:postfix_master_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=system kernel: [146194.145456] type=1400 audit(1318924444.389:3810): avc: denied { module_request } for pid=15452 comm="master" kmod="net-pf-10" scontext=system_u:system_r:postfix_master_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=system kernel: [146194.146585] type=1400 audit(1318924444.390:3811): avc: denied { module_request } for pid=15452 comm="master" kmod="net-pf-10" scontext=system_u:system_r:postfix_master_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=system kernel: [146194.390715] type=1400 audit(1318924444.633:3812): avc: denied { module_request } for pid=15479 comm="postsuper" kmod="net-pf-10" scontext=system_u:system_r:postfix_master_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=system kernel: [146194.451670] type=1400 audit(1318924444.694:3813): avc: denied { module_request } for pid=15516 comm="postlog" kmod="net-pf-10" scontext=system_u:system_r:postfix_master_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=system kernel: [146194.459587] type=1400 audit(1318924444.702:3814): avc: denied { module_request } for pid=15517 comm="master" kmod="net-pf-10" scontext=system_u:system_r:postfix_master_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=system kernel: [146194.460786] type=1400 audit(1318924444.703:3815): avc: denied { module_request } for pid=15517 comm="master" kmod="net-pf-10" scontext=system_u:system_r:postfix_master_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=system systemd[1]: PID 15517 read from file /var/spool/postfix/pid/master.pid does not exist. Your service or init script might be broken. systemd[1]: postfix.service: main process exited, code=exited, status=1 following steps were done : I reinstall postfix Created .autorelable and reboot restorecon -R -v /etc/postfix restorecon -R -v /var/lib/postfix Can someone tell me what am doing wrong ? Update It turns out that we have to disable the ipv6 in the main.cf and these errors were disappear. THank you

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  • Communicating via Command Mode with IBM HS22 IMM via AMM

    - by MikeyB
    On previous model blades that contained a BMC, I was able to communicate from our external management station via pass-through commands to the BMC to do things such as power blades on/off, set VPD parameters, reboot the BMC, etc. Now on the HS22, a bunch of things happen differently. For example, we can no longer use the same pass-through commands to write VPD information pages and have them persist across reboots of the IMM - it looks as though those VPD pages are populated from information contained in the IMM. How do we use the Advanced Settings Utility from an external host to communicate with HS22 IMMs? Alternatively, what TCP Command Mode commands do we need to send to the AMM to communicate with the IMM? For our purposes, we specifically cannot communicate with the IMM from the blade itself. Specific example: When I send a pass-thru IPMI command via the AMM to the blade BMC to write information (such as MTM, Serial) into VPD page 0x10, it persists on blades with a BMC (HS21 for example). I can send the same IPMI command to write data to the VPD page on the HS22, however it does not persist across reboots of the IMM. What IPMI commands do I need to send to the IMM? What IPMI commands are asu sending when it sets the MTM & Serial?

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  • Excel 2010 data validation warning (compatibility mode)

    - by Madmanguruman
    We have some legacy worksheets that were created in Excel 2003, which are used by LabVIEW-based test automation software. The current LabVIEW software can only handle the legacy .xls format, so we're forced to keep these worksheets as-is for the time being. We've migrated to Office 2010 and when working with these worksheets, I see this warning: "The following features in this workbook are not supported by earlier versions of Excel. These features may be lost or degraded when you save this workbook in the currently selected file format. Click Continue to save the workbook anyway. To keep all of your features, click Cancel and then save the file in one of the new file formats." "Significant loss of functionality" "One or more cells in this workbook contain data validation rules which refer to values on other worksheets. These data validation rules will not be saved." When I click 'Find', some cells that do indeed have validation rules are highlighted, but those rules are all on the same worksheet! We're using simple list-based validation, with some cells off to the side containing the valid values (for example, cell B4 has a List with Source "=$D$4:$E$4") This makes no sense to me whatsoever. One, the workbook was created in Excel 2003, so obviously we couldn't implement a feature that doesn't exist. Secondly, the modifications we're making don't involve changing the validation rules at all. Thirdly, the complaint that Excel is making is incorrect! All of the rules are on the same worksheet as the target. As if the story wasn't bizarre enough: I went ahead and saved the worksheet with Excel 2010. I then went to an old computer back in the lab and opened the document with Excel 2003. Guess what - the validations were untouched! My questions are: is this a legitimate bug in Excel 2010, or is this some exotic error in the legacy .xls worksheet that is confusing the heck out of Excel 2010? Has anyone else observed this issue working in compatibility mode?

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  • Adobe Acrobat Reader don't zoom out the page enough in "one page" mode

    - by mbaitoff
    I'm using Adobe Acrobat Reader version 9.4 under Debian Lenny. I'm experiencing a problem: when I push the "Show one page at a time" button, I expect the page to zoom such that pressing PgUp/PgDn would turn to the next/previous page. However, the zoom seems to be not enough - very thin bottom portion of the page doesn't fit inside the reader window, and pressing PgUp/PgDn gives the jitter of the same page, and I have to push twice to get to the next page. It is even worse in continuous page mode - a roll of pages begin to be non-synced with window boundaries, ending up with page break right in the middle of the view after several turns of the pages. This behaviour doesn't occur on windows version - I have a page properly zoomed in single/continuous modes, so that turning the pages is performed as page-at-once, as intended. How to make the Acrobat Reader fit the page to window properly? Thats how it looks before pressing PgDn (notice the bottom edge of the "paper" hidden beneath the bottom window edge): Thats how it looks after pressing PgDn (notice the "paper" bottom edge emerged from beneath the window edge, while the "paper" upper edge hides behind the upper window edge, showing that the document window size is not enough to contain the whole page):

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