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• Creating a QMainWindow from Java using JNI

  - by ebasconp

  Hi everybody: I'm trying to create a Qt main windows from Java using JNI directly and I got a threading error. My code looks like this: Test class: public class Test { public static void main(String... args) { System.out.println(System.getProperty("java.library.path")); TestWindow f = new TestWindow(); f.show(); } } TestWindow class: public class TestWindow { static { System.loadLibrary("mylib"); } public native void show(); } C++ impl: void JNICALL Java_testpackage_TestWindow_show (JNIEnv *, jobject) { int c = 0; char** a = NULL; QApplication* app = new QApplication(c, a); QMainWindow* mw = new QMainWindow(); mw->setWindowTitle("Hello"); mw->setGeometry(150, 150, 400, 300); mw->show(); QApplication::exec(); } and I get my window painted but frozen (it does not receive any event) and the following error message when instantiating the QMainWindow object: QCoreApplication::sendPostedEvents: Cannot send posted events for objects in another thread I know all the UI operations must done in the UI thread but in my example I created the QApplication in the only thread I have running, so, everything should work properly. I did some tests executing the code of my "show" method from a QMetaObject::invokeMethod stuff using Qt::QueuedConnection but nothing works properly. I know I could use Jambi... but I know that it could be done natively too and that is what I want to do :) Any ideas on this? Thanks in advance! Ernesto

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• Why is there no autorelease pool when I do performSelectorInBackground: ?

  - by Thanks

  I am calling a method that goes in a background thread: [self performSelectorInBackground:@selector(loadViewControllerWithIndex:) withObject:[NSNumber numberWithInt:viewControllerIndex]]; then, I have this method implementation that gets called by the selector: - (void) loadViewControllerWithIndex:(NSNumber *)indexNumberObj { NSAutoreleasePool *arPool = [[NSAutoreleasePool alloc] init]; NSInteger vcIndex = [indexNumberObj intValue]; Class c; UIViewController *controller = [viewControllers objectAtIndex:vcIndex]; switch (vcIndex) { case 0: c = [MyFirstViewController class]; break; case 1: c = [MySecondViewController class]; break; default: NSLog(@"unknown index for loading view controller: %d", vcIndex); // error break; } if ((NSNull *)controller == [NSNull null]) { controller = [[c alloc] initWithNib]; [viewControllers replaceObjectAtIndex:vcIndex withObject:controller]; [controller release]; } if (controller.view.superview == nil) { UIView *placeholderView = [viewControllerPlaceholderViews objectAtIndex:vcIndex]; [placeholderView addSubview:controller.view]; } [arPool release]; } Althoug I do create an autorelease pool there for that thread, I always get this error: 2009-05-30 12:03:09.910 Demo[1827:3f03] *** _NSAutoreleaseNoPool(): Object 0x523e50 of class NSCFNumber autoreleased with no pool in place - just leaking Stack: (0x95c83f0f 0x95b90442 0x28d3 0x2d42 0x95b96e0d 0x95b969b4 0x93a00155 0x93a00012) If I take away the autorelease pool, I get a whole bunch of messages like these. I also tried to create an autorelease pool around the call of the performSelectorInBackground:, but that doesn't help. I suspect the parameter, but I don't know why the compiler complains about an NSCFNumber. Am I missing something? My Instance variables are all "nonatomic". Can that be a problem? UPDATE: I may also suspect that some variable has been added to an autorelease pool of the main thread (maybe an ivar), and now it trys to release that one inside the wrong autorelease pool? If so, how could I fix that? (damn, this threading stuff is complex ;) )

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• Putting a C++ Vector as a Member in a Class that Uses a Memory Pool

  - by Deep-B

  Hey, I've been writing a multi-threaded DLL for database access using ADO/ODBC for use with a legacy application. I need to keep multiple database connections for each thread, so I've put the ADO objects for each connection in an object and thinking of keeping an array of them inside a custom threadInfo object. Obviously a vector would serve better here - I need to delete/rearrange objects on the go and a vector would simplify that. Problem is, I'm allocating a heap for each thread to avoid heap contention and stuff and allocating all my memory from there. So my question is: how do I make the vector allocate from the thread-specific heap? (Or would it know internally to allocate memory from the same heap as its wrapper class - sounds unlikely, but I'm not a C++ guy) I've googled a bit and it looks like I might need to write an allocator or something - which looks like so much of work I don't want. Is there any other way? I've heard vector uses placement-new for all its stuff inside, so can overloading operator new be worked into it? My scant knowledge of the insides of C++ doesn't help, seeing as I'm mainly a C programmer (even that - relatively). It's very possible I'm missing something elementary somewhere. If nothing easier comes up - I might just go and do the array thing, but hopefully it won't come to that. I'm using MS-VC++ 6.0 (hey, it's rude to laugh! :-P ). Any/all help will be much appreciated.

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• BackgroundWorker and instance variables

  - by Alastair Pitts

  One thing that's always confused me is how a BackgroundWorker seems to have thread-safe access to the instance variables of the surrounding class. Given a basic class: public class BackgroundProcessor { public List<int> Items { get; private set; } public BackgroundProcessor(IEnumerable<int> items) { Items = new List<int>(items); } public void DoWork() { BackgroundWorker worker = new BackgroundWorker(); worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted); worker.DoWork += new DoWorkEventHandler(worker_DoWork); worker.RunWorkerAsync(); } void worker_DoWork(object sender, DoWorkEventArgs e) { var processor = new ProcessingClass(); processor.Process(this.Points); //Accessing the instance variable } void worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { //Stuff goes here } } Am I erroneous in my assumption the the call to processor.Process(this.Points); is a thread-safe call? How don't I get a cross-thread access violation? I'm sure it's obvious, but it always has confused me.

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• Private Java class properties mysteriously reset between method calls....

  - by Michael Jones

  I have a very odd problem. A class property is mysteriously reset between method calls. The following code is executed so the constructor is called, then the parseConfiguration method is called. Finally, processData is called. The parseConfiguration method sets the "recursive" property to "true". However, as soon as it enters "processData", "recursive" becomes "false". This problem isn't isolated to a single class -- I have several examples of this in my code. How can this possibly be happening? I've tried initialising properties when they're declared outside any methods, I've tried initialising them in constructors... nothing works. The only complication I can think of here is that this class is invoked by an object that runs in a thread -- but here is one instance per thread, so surely no chance that threads are interfering. I've tried setting both methods to "synchronized", but this still happens. Please help! /** * This class or its superclasses are NOT threaded and don't extend Thread */ public class DirectoryAcquirer extends Manipulator { /** * @var Whether to recursively scan directories */ private boolean recursive = false; /** * Constructor */ public DirectoryAcquirer() { } /** * Constructor that initialises the configuration * * @param config * @throws InvalidConfigurationException */ public DirectoryAcquirer(HierarchicalConfiguration config) throws InvalidConfigurationException { super(config); } @Override protected void parseConfiguration() throws InvalidConfigurationException { // set whether to recurse into directories or not if (this.config.containsKey("recursive")) { // this.recursive gets set to "true" here this.recursive = this.config.getBoolean("recursive"); } } @Override public EntityCollection processData(EntityCollection data) { // here this.recursive is "false" this.logger.debug("processData: Entered method"); } }

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• [F#] Parallelize code in nested loops

  - by Juliet

  You always hear that functional code is inherently easier to parallelize than non-functional code, so I decided to write a function which does the following: Given a input of strings, total up the number of unique characters for each string. So, given the input [ "aaaaa"; "bbb"; "ccccccc"; "abbbc" ], our method will returns a: 6; b: 6; c: 8. Here's what I've written: (* seq<#seq<char>> -> Map<char,int> *) let wordFrequency input = input |> Seq.fold (fun acc text -> (* This inner loop can be processed on its own thread *) text |> Seq.choose (fun char -> if Char.IsLetter char then Some(char) else None) |> Seq.fold (fun (acc : Map<_,_>) item -> match acc.TryFind(item) with | Some(count) -> acc.Add(item, count + 1) | None -> acc.Add(item, 1)) acc ) Map.empty This code is ideally parallelizable, because each string in input can be processed on its own thread. Its not as straightforward as it looks since the innerloop adds items to a Map shared between all of the inputs. I'd like the inner loop factored out into its own thread, and I don't want to use any mutable state. How would I re-write this function using an Async workflow?

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• crash log in device

  - by seenu

  I need help to understand the crash log. The app works fine on my simulator but it crashes in device. my simulator is run with:-iPhone Simulator 225, iPhone OS 4.1 (iPhone 4/8B5091b) this is my device crash log:- Incident Identifier: CD0E8B93-5CF9-402C-9787-4B175C51A690 CrashReporter Key: 1961913be3204fe8cb5a39c1e00ac0f03a452876 Hardware Model: iPhone1,2 Process: My Game[1115] Path: /var/mobile/Applications/2968E5FB-96DD-443D-B386-D68F08E9345E/My Game.app/My Game Identifier: My Game Version: ??? (???) Code Type: ARM (Native) Parent Process: launchd [1] Date/Time: 2010-12-29 23:39:15.753 -0500 OS Version: **iPhone OS 4.2.1 (8C148)** Report Version: 104 Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x00000000, 0x00000000 Crashed Thread: 0 Thread 0 Crashed: 0 libSystem.B.dylib 0x35de3ad0 0x35d5a000 + 563920 1 libSystem.B.dylib 0x35de3abe 0x35d5a000 + 563902 2 libSystem.B.dylib 0x35de3ab2 0x35d5a000 + 563890 3 libSystem.B.dylib 0x35dfad5e 0x35d5a000 + 658782 4 libstdc++.6.dylib 0x374f2a00 0x3748d000 + 416256 5 libobjc.A.dylib 0x32d9d8d8 0x32d95000 + 35032 6 libstdc++.6.dylib 0x374f0100 0x3748d000 + 405760 7 libstdc++.6.dylib 0x374f0178 0x3748d000 + 405880 8 libstdc++.6.dylib 0x374f02a0 0x3748d000 + 406176 9 libobjc.A.dylib 0x32d9bf28 0x32d95000 + 28456 10 CoreFoundation 0x3759dabc 0x374f9000 + 674492 11 Foundation 0x351a3e6c 0x35151000 + 339564 12 My Game 0x0006325c 0x1000 + 402012 13 My Game 0x00003c98 0x1000 + 11416 14 My Game 0x00062108 0x1000 + 397576 15 My Game 0x00003b08 0x1000 + 11016 16 My Game 0x000074d8 0x1000 + 25816 17 CoreFoundation 0x375466fc 0x374f9000 + 317180 18 CoreFoundation 0x375465d6 0x374f9000 + 316886 19 My Game 0x0005c818 0x1000 + 374808 20 My Game 0x000596a4 0x1000 + 362148 21 CoreFoundation 0x37542a3c 0x374f9000 + 301628 22 My Game 0x000b692c 0x1000 + 743724 23 My Game 0x000b7550 0x1000 + 746832 24 My Game 0x000c2a7c 0x1000 + 793212 25 UIKit 0x358f4ea8 0x358d3000 + 138920 26 UIKit 0x358f44dc 0x358d3000 + 136412 27 UIKit 0x358d7c94 0x358d3000 + 19604 28 UIKit 0x358d73ac 0x358d3000 + 17324 29 GraphicsServices 0x33e77c80 0x33e72000 + 23680 30 CoreFoundation 0x3752f5c4 0x374f9000 + 222660 31 CoreFoundation 0x3752f582 0x374f9000 + 222594 32 CoreFoundation 0x3752182e 0x374f9000 + 165934 33 CoreFoundation 0x37521504 0x374f9000 + 165124 34 CoreFoundation 0x37521412 0x374f9000 + 164882 35 GraphicsServices 0x33e76d1c 0x33e72000 + 19740 36 UIKit 0x3591d574 0x358d3000 + 304500 37 UIKit 0x3591a550 0x358d3000 + 292176 38 My Game 0x000030a4 0x1000 + 8356 39 My Game 0x00003010 0x1000 + 8208 Thread 1: 0 libSystem.B.dylib 0x35d8f974 0x35d5a000 + 219508 1 libSystem.B.dylib 0x35e5e2fc 0x35d5a000 + 1065724 2 libSystem.B.dylib 0x35e5dd68 0x35d5a000 + 1064296 3 libSystem.B.dylib 0x35e5d788 0x35d5a000 + 1062792 4 libSystem.B.dylib 0x35de6970 0x35d5a000 + 575856 5 libSystem.B.dylib 0x35ddd2fc 0x35d5a000 + 537340 Thread 2: 0 libSystem.B.dylib 0x35d5b3b0 0x35d5a000 + 5040 1 libSystem.B.dylib 0x35d5d894 0x35d5a000 + 14484 2 CoreFoundation 0x37521f7c 0x374f9000 + 167804 3 CoreFoundation 0x37521780 0x374f9000 + 165760 4 CoreFoundation 0x37521504 0x374f9000 + 165124 5 CoreFoundation 0x37521412 0x374f9000 + 164882 6 WebCore 0x3318bd14 0x33070000 + 1162516 7 libSystem.B.dylib 0x35de5b44 0x35d5a000 + 572228 8 libSystem.B.dylib 0x35dd77a4 0x35d5a000 + 513956 Thread 0 crashed with ARM Thread State: r0: 0x00000000 r1: 0x00000000 r2: 0x00000001 r3: 0x3e74f308 r4: 0x00000006 r5: 0x00238cfc r6: 0x00238ff0 r7: 0x2fdfdd2c r8: 0x3eba21b8 r9: 0x0000000a r10: 0x3eba21bc r11: 0x0022fb00 ip: 0x00000025 sp: 0x2fdfdd2c lr: 0x35de3ac5 pc: 0x35de3ad0 cpsr: 0x000a0010 Binary Images: 0x1000 - 0xebfff +My Gamearmv6 <15bbbead83159dac341a987c660d2b28> /var/mobile/Applications/2968E5FB-96DD-443D-B386-D68F08E9345E/My Game.app/My Game 0x1f8000 - 0x1f9fff dns.so armv6 <88b569311cca4a9593b2d670051860d1> /usr/lib/info/dns.so 0x2fe00000 - 0x2fe29fff dyld armv6 <617f6daf4103547c47a8407a2e0b90de> /usr/lib/dyld 0x30229000 - 0x30268fff MBXGLEngine armv6 <9d60c44b1ddc55387a0cb77f90660b37> /System/Library/Frameworks/OpenGLES.framework/MBXGLEngine.bundle/MBXGLEngine 0x3027c000 - 0x3027efff IOMobileFramebuffer armv6 <f42bbbf67195a7b98d67ad021bba4784> /System/Library/PrivateFrameworks/IOMobileFramebuffer.framework/IOMobileFramebuffer 0x3027f000 - 0x3038dfff CFNetwork armv6 <d6eeee83216ee9c553134f069f37cbc2> /System/Library/Frameworks/CFNetwork.framework/CFNetwork 0x303ef000 - 0x303f4fff CaptiveNetwork armv6 <f41df4b358b77b29ff85e0eaea88ee1d> /System/Library/PrivateFrameworks/CaptiveNetwork.framework/CaptiveNetwork 0x303f5000 - 0x30444fff Security armv6 <cf625b4dc7ea928891313444ef64a7cb> /System/Library/Frameworks/Security.framework/Security 0x30445000 - 0x3055cfff libicucore.A.dylib armv6 <8968ff3f62d7780bb1bd75026a7628d0> /usr/lib/libicucore.A.dylib 0x3055d000 - 0x30561fff ApplePushService armv6 <0560b630d26e261e205fc58942e1885c> /System/Library/PrivateFrameworks/ApplePushService.framework/ApplePushService 0x3059d000 - 0x305a8fff MobileWiFi armv6 <c7532e63e083a1dd2a0ef7352b85749d> /System/Library/PrivateFrameworks/MobileWiFi.framework/MobileWiFi 0x305aa000 - 0x30612fff libvDSP.dylib armv6 <9d264733fc675943c082bd3b9b567b59> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libvDSP.dylib 0x30613000 - 0x3064dfff MobileCoreServices armv6 <beb473ce80390554bb4af21554522286> /System/Library/Frameworks/MobileCoreServices.framework/MobileCoreServices 0x3065c000 - 0x3066efff libbsm.0.dylib armv6 <51e7bb18da9afa44a33e54e42fbd0707> /usr/lib/libbsm.0.dylib 0x3066f000 - 0x306c6fff CoreMedia armv6 <cd5e9398c161f129146931e888e1c92e> /System/Library/Frameworks/CoreMedia.framework/CoreMedia 0x306f0000 - 0x306fefff libz.1.dylib armv6 <84592e96bae1a661374b0f9a5d03a3a0> /usr/lib/libz.1.dylib 0x306ff000 - 0x30729fff PrintKit armv6 <74f9710fa01a33b5bb04c4aeabd6be7d> /System/Library/PrivateFrameworks/PrintKit.framework/PrintKit 0x3072e000 - 0x307d0fff AVFoundation armv6 <da9d96f32791f51ecb439c5eaeeff59a> /System/Library/Frameworks/AVFoundation.framework/AVFoundation 0x307d7000 - 0x3082afff IOKit armv6 <20da5e822f21a8d0a7c5b3e149330efd> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit 0x30831000 - 0x3083bfff AccountSettings armv6 <eca67ab04f724e1fa7c6406c88e75433> /System/Library/PrivateFrameworks/AccountSettings.framework/AccountSettings 0x30a04000 - 0x30aa3fff ProofReader armv6 <2734920b62f174c17aeeb15f371615ef> /System/Library/PrivateFrameworks/ProofReader.framework/ProofReader 0x30ad6000 - 0x30b1afff AddressBook armv6 <1f30c3370dad27331a491ba4b190813c> /System/Library/Frameworks/AddressBook.framework/AddressBook 0x30b3d000 - 0x30b9cfff CoreAudio armv6 <ccc4bace0d6eca79a32ed84d566f72e9> /System/Library/Frameworks/CoreAudio.framework/CoreAudio 0x32d7d000 - 0x32d89fff libkxld.dylib armv6 <f74f359de7bbe3ccdc37fa6f332aebf4> /usr/lib/system/libkxld.dylib 0x32d95000 - 0x32e5cfff libobjc.A.dylib armv6 <429841269f8bcecd4ba3264a8725dad6> /usr/lib/libobjc.A.dylib 0x32e5d000 - 0x32ecdfff libsqlite3.dylib armv6 <87b9bb47687902d9120d03d1da9eb9fc> /usr/lib/libsqlite3.dylib 0x32f0c000 - 0x32f1ffff libmis.dylib armv6 <dba9c086b49bd9540930ff27211570d6> /usr/lib/libmis.dylib 0x33055000 - 0x33061fff SpringBoardServices armv6 <fd0c472436b3306f5b56118c93c8a423> /System/Library/PrivateFrameworks/SpringBoardServices.framework/SpringBoardServices 0x33062000 - 0x3306ffff MobileBluetooth armv6 <2b68516e1321011a4efbee2947d463c6> /System/Library/PrivateFrameworks/MobileBluetooth.framework/MobileBluetooth 0x33070000 - 0x338bffff WebCore armv6 <aa3b6827f051da7a3494c9bee4ebe290> /System/Library/PrivateFrameworks/WebCore.framework/WebCore 0x33ab4000 - 0x33ab4fff Accelerate armv6 <cdde24a7ad004b2b2e600cd4f3ac5eb7> /System/Library/Frameworks/Accelerate.framework/Accelerate 0x33bbc000 - 0x33c0afff CoreText armv6 <16c9582fdffb598178287c6ce9fd6897> /System/Library/Frameworks/CoreText.framework/CoreText 0x33c16000 - 0x33d73fff libGLProgrammability.dylib armv6 <aec6b54ffd532bb607aab4acbab679b6> /System/Library/Frameworks/OpenGLES.framework/libGLProgrammability.dylib 0x33d85000 - 0x33e71fff QuartzCore armv6 <77cd91ff21fe6c58c309f2c82eb95ca5> /System/Library/Frameworks/QuartzCore.framework/QuartzCore 0x33e72000 - 0x33e81fff GraphicsServices armv6 <af20aba0ec96e7b7c42bb55ac763c784> /System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices 0x33ead000 - 0x33f6efff ImageIO armv6 <0c1b6f466667ff345f2399d8142a9d10> /System/Library/Frameworks/ImageIO.framework/ImageIO 0x33f78000 - 0x33f79fff CoreSurface armv6 <5e290514380c626e9b0f9f9985b9dc7a> /System/Library/PrivateFrameworks/CoreSurface.framework/CoreSurface 0x34137000 - 0x34156fff EAP8021X armv6 <fa56845b5396c3ebb368c2368331643c> /System/Library/PrivateFrameworks/EAP8021X.framework/EAP8021X 0x343a0000 - 0x343bffff Bom armv6 <f41bef81e23e2bff59155e5ce46762d3> /System/Library/PrivateFrameworks/Bom.framework/Bom 0x343c0000 - 0x344bdfff JavaScriptCore armv6 <3547c92c1efc0522b087e7f10eba7728> /System/Library/PrivateFrameworks/JavaScriptCore.framework/JavaScriptCore 0x344be000 - 0x34500fff ManagedConfiguration armv6 <397723a33c19c3487d304d69580acbfc> /System/Library/PrivateFrameworks/ManagedConfiguration.framework/ManagedConfiguration 0x34b52000 - 0x34f1ffff libLAPACK.dylib armv6 <0eb734c91165416224b98c943ff6476b> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libLAPACK.dylib 0x34f20000 - 0x35014fff libiconv.2.dylib armv6 <01916d6784f4de8f3746978faae9c5fa> /usr/lib/libiconv.2.dylib 0x35015000 - 0x35022fff CoreVideo armv6 <7b100fd5fdf98db1cd0f0649e7f6f316> /System/Library/Frameworks/CoreVideo.framework/CoreVideo 0x35151000 - 0x35272fff Foundation armv6 <6bdeb19a1fcb93e2930dadb50416f881> /System/Library/Frameworks/Foundation.framework/Foundation 0x3529b000 - 0x352a6fff libbz2.1.0.dylib armv6 <6aa8a4ed0906a495d059ace9125f525d> /usr/lib/libbz2.1.0.dylib 0x352dc000 - 0x35342fff libBLAS.dylib armv6 <11a3677a08175a30df1b3d66d7e0951a> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libBLAS.dylib 0x35406000 - 0x35406fff vecLib armv6 <8f914b3e8a581d49fb21d2c0ff75be03> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/vecLib 0x35407000 - 0x3540afff MobileInstallation armv6 <456ed7fe6dd9fcd8e78df425085b1452> /System/Library/PrivateFrameworks/MobileInstallation.framework/MobileInstallation 0x354be000 - 0x354dcfff OpenAL armv6 <e86dc71ad650db8a13e4785e9c35a4b9> /System/Library/Frameworks/OpenAL.framework/OpenAL 0x35541000 - 0x35547fff MBX2D armv6 <fad4955cab36e0179df6f8f27d365b8f> /System/Library/PrivateFrameworks/MBX2D.framework/MBX2D 0x35815000 - 0x3581afff AssetsLibraryServices armv6 <224b3cf992a01814f91481244e3213eb> /System/Library/PrivateFrameworks/AssetsLibraryServices.framework/AssetsLibraryServices 0x3581b000 - 0x35877fff libGLImage.dylib armv6 <7c1049f20c4e64591c09d3ac00c7d3ab> /System/Library/Frameworks/OpenGLES.framework/libGLImage.dylib 0x358bc000 - 0x358c3fff liblockdown.dylib armv6 <f470dea180ddf23886df75eb256d3888> /usr/lib/liblockdown.dylib 0x358cc000 - 0x358cffff libgcc_s.1.dylib armv6 <bed95ed187350ce27d22ed241ef892ea> /usr/lib/libgcc_s.1.dylib 0x358d3000 - 0x35d4ffff UIKit armv6 <14ec6c926b8bda71b73136f6e1a6ac1b> /System/Library/Frameworks/UIKit.framework/UIKit 0x35d5a000 - 0x35e98fff libSystem.B.dylib armv6 <70571c1e697e2ae7f7a9b1a499453bb6> /usr/lib/libSystem.B.dylib 0x35f7e000 - 0x35fc2fff VideoToolbox armv6 <101dbbcd34cc3231a8be3fd6392556aa> /System/Library/PrivateFrameworks/VideoToolbox.framework/VideoToolbox 0x35fdb000 - 0x36162fff CoreGraphics armv6 <9a1d72fa9549d83abc1e735ba37a4dc2> /System/Library/Frameworks/CoreGraphics.framework/CoreGraphics 0x36179000 - 0x36255fff WebKit armv6 <83da207070be989ba81dba3a83d5206a> /System/Library/PrivateFrameworks/WebKit.framework/WebKit 0x36269000 - 0x36278fff OpenGLES armv6 <37eda5ddcff210dd321157da35a87a5e> /System/Library/Frameworks/OpenGLES.framework/OpenGLES 0x363f3000 - 0x363f9fff MobileKeyBag armv6 <2d83bf6a43bab972d77a1a6e0f3b03d2> /System/Library/PrivateFrameworks/MobileKeyBag.framework/MobileKeyBag 0x365db000 - 0x365f9fff libresolv.9.dylib armv6 <9c94634beea733e754dc115737b6e63c> /usr/lib/libresolv.9.dylib 0x36746000 - 0x3683cfff libxml2.2.dylib armv6 <9c44d05cc67f1ebabd795903e581724e> /usr/lib/libxml2.2.dylib 0x3683e000 - 0x36888fff libCGFreetype.A.dylib armv6 <cfc94cfa17958f2f94c9eff208a7dace> /System/Library/Frameworks/CoreGraphics.framework/Resources/libCGFreetype.A.dylib 0x3694c000 - 0x3694ffff libAccessibility.dylib armv6 <74e0f77cc276a9412be268c795fdcbca> /usr/lib/libAccessibility.dylib 0x36955000 - 0x36a1ffff Celestial armv6 <11172a6ee53bdf067548cd4496bc5fe0> /System/Library/PrivateFrameworks/Celestial.framework/Celestial 0x36a2d000 - 0x36a30fff CrashReporterSupport armv6 <00bc60f690e6328b64e7a7b718edf45a> /System/Library/PrivateFrameworks/CrashReporterSupport.framework/CrashReporterSupport 0x36a31000 - 0x36a74fff CoreTelephony armv6 <cabbce0fa7630065dc7e7d3ca3bc616c> /System/Library/Frameworks/CoreTelephony.framework/CoreTelephony 0x36c1c000 - 0x36c26fff AggregateDictionary armv6 <f7429444c955e4f13c6761d20032ab52> /System/Library/PrivateFrameworks/AggregateDictionary.framework/AggregateDictionary 0x36c2b000 - 0x36de1fff AudioToolbox armv6 <bb65e8ed531fe5923eb8ac00a7c0d87d> /System/Library/Frameworks/AudioToolbox.framework/AudioToolbox 0x36de2000 - 0x36e16fff AppSupport armv6 <783e14db9585fd063c0c2a755cd121b6> /System/Library/PrivateFrameworks/AppSupport.framework/AppSupport 0x36e17000 - 0x36e2dfff PersistentConnection armv6 <006723906b8ac250c1681a1821fbe94d> /System/Library/PrivateFrameworks/PersistentConnection.framework/PersistentConnection 0x37141000 - 0x37184fff SystemConfiguration armv6 <207f362e707871e74a292cfd1ea7893d> /System/Library/Frameworks/SystemConfiguration.framework/SystemConfiguration 0x372aa000 - 0x37477fff MediaToolbox armv6 <21ceabd0e5de17ad4e883c85fcd34d51> /System/Library/PrivateFrameworks/MediaToolbox.framework/MediaToolbox 0x37478000 - 0x3747dfff IOSurface armv6 <ffd66ca04dfe7d382d6961f0df3839ff> /System/Library/PrivateFrameworks/IOSurface.framework/IOSurface 0x3748d000 - 0x374f8fff libstdc++.6.dylib armv6 <eccd1d7183e73587b2c0aa5755a19c39> /usr/lib/libstdc++.6.dylib 0x374f9000 - 0x375e4fff CoreFoundation armv6 <ab0eac0ddd5b4ae1bf8541116e3c0bd1> /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation 0x3760a000 - 0x3760bfff DataMigration armv6 <d2de7c0db77278484236669c2cdccabb> /System/Library/PrivateFrameworks/DataMigration.framework/DataMigration 0x37731000 - 0x37736fff libGFXShared.dylib armv6 <bd1c480607cc286288db1ca1aec64180> /System/Library/Frameworks/OpenGLES.framework/libGFXShared.dylib 0x377f6000 - 0x37817fff libRIP.A.dylib armv6 <22c6da37f3adf325f99c3a0494e04c02> /System/Library/Frameworks/CoreGraphics.fram

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• Canceling a WSK I/O operation when driver is unloading

  - by eaducac

  I've been learning how to write drivers with the Windows DDK recently. After creating a few test drivers experimenting with system threads and synchronization, I decided to step it up a notch and write a driver that actually does something, albeit something useless. Currently, my driver connects to my other computer using Winsock Kernel and just loops and echoes back whatever I send to it until it gets the command "exit", which causes it to break out of the loop. In my loop, after I call WskReceive() to get some data from the other computer, I use KeWaitForMultipleObjects() to wait for either of two SynchronizationEvents. BlockEvent gets set by my IRP's CompletionRoutine() to let my thread know that it's received some data from the socket. EndEvent gets set by my DriverUnload() routine to tell the thread that it's being unloaded and it needs to terminate. When I send the "exit" command, the thread terminates with no problems, and I can safely unload the driver afterward. If I try to stop the driver while it's still waiting on data from the other computer, however, it blue screens with the error DRIVER_UNLOADED_WITHOUT_CANCELLING_PENDING_OPERATIONS. After I get the EndEvent but before I exit the loop, I've tried canceling the IRP with IoCancelIrp() and completing it with IoCompleteRequest(), but both of those give me DRIVER_IRQL_NOT_LESS_OR_EQUAL errors. I then tried calling WskDisconnect(), hoping that would cause the receive operation to complete, but that took me back to the CANCELLING_PENDING_OPERATIONS error. How do I cancel my pending I/O operation from my WSK socket at the IRQL I'm running at when the driver is unloaded?

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• What to do when ServerSocket throws IOException and keeping server running

  - by s5804

  Basically I want to create a rock solid server. while (keepRunning.get()) { try { Socket clientSocket = serverSocket.accept(); ... spawn a new thread to handle the client ... } catch (IOException e) { e.printStackTrace(); // NOW WHAT? } } In the IOException block, what to do? Is the Server socket at fault so it need to be recreated? For example wait a few seconds and then serverSocket = ServerSocketFactory.getDefault().createServerSocket(MY_PORT); However if the server socket is still OK, then it is a pity to close it and kill all previously accepted connections that are still communicating. EDIT: After some answers, here my attempt to deal with the IOException. Would the implementation be guaranteeing keeping the server up and only re-create server socket when only necessary? while (keepRunning.get()) { try { Socket clientSocket = serverSocket.accept(); ... spawn a new thread to handle the client ... bindExceptionCounter = 0; } catch (IOException e) { e.printStackTrace(); recreateServerSocket(); } } private void recreateServerSocket() { while (keepRunning) { try { logger.info("Try to re-create Server Socket"); ServerSocket socket = ServerSocketFactory.getDefault().createServerSocket(RateTableServer.RATE_EVENT_SERVER_PORT); // No exception thrown, then use the new socket. serverSocket = socket; break; } catch (BindException e) { logger.info("BindException indicates that the server socket is still good.", e); bindExceptionCounter++; if (bindExceptionCounter < 5) { break; } } catch (IOException e) { logger.warn("Problem to re-create Server Socket", e); e.printStackTrace(); try { Thread.sleep(30000); } catch (InterruptedException ie) { logger.warn(ie); } } } }

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• Java try finally variations

  - by Petr Gladkikh

  This question nags me for a while but I did not found complete answer to it yet (e.g. this one is for C# http://stackoverflow.com/questions/463029/initializing-disposable-resources-outside-or-inside-try-finally). Consider two following Java code fragments: Closeable in = new FileInputStream("data.txt"); try { doSomething(in); } finally { in.close(); } and second variation Closeable in = null; try { in = new FileInputStream("data.txt"); doSomething(in); } finally { if (null != in) in.close(); } The part that worries me is that the thread might be somewhat interrupted between the moment resource is acquired (e.g. file is opened) but resulting value is not assigned to respective local variable. Is there any other scenarios the thread might be interrupted in the point above other than: InterruptedException (e.g. via Thread#interrupt()) or OutOfMemoryError exception is thrown JVM exits (e.g. via kill, System.exit()) Hardware fail (or bug in JVM for complete list :) I have read that second approach is somewhat more "idiomatic" but IMO in the scenario above there's no difference and in all other scenarios they are equal. So the question: What are the differences between the two? Which should I prefer if I do concerned about freeing resources (especially in heavily multi-threading applications)? Why? I would appreciate if anyone points me to parts of Java/JVM specs that support the answers.

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• Applet class loader cannot find one of the classes in the jar

  - by Chry Cheng

  I get the ff. error in Java Console occassionally: Exception in thread "thread applet-my.package.MyApplet-10" java.lang.NoClassDefFoundError: another/package/SomeClass at my.package.MyApplet.init(MyApplet.java:95) at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.ClassNotFoundException: another.package.SomeClass at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClassInternal(Unknown Source) ... 3 more Caused by: java.io.IOException: open HTTP connection failed:https://myserver/mycontext/applets/another/package/SomeClass.class at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source) at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source) at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) ... 7 more My applet tag is as follows: <applet codebase="../../applets" code="my.package.MyApplet" class="invisible" id="myApplet"> <param value="value0" name="param0"/> ... <param value="valueN" name="paramN" /> <param value="folder/myApplet__0.0.1177.jar,folder/commons-io-1.3.2__0.0.1177.jar,..." name="cache_archive"/> <param value="0.0.1177.0,0.0.1177.0,...," name="cache_version"/> </applet> It is important I stress the word "occasionally". Sometimes the applet is initialized without a hitch. This also means that, often, when the browser is restarted, the problem goes away. I am aware of http://stackoverflow.com/questions/698890/applet-fails-to-load-class-from-jar and http://stackoverflow.com/questions/872905/applet-class-loader-cannot-find-a-class-in-the-applets-jar but I think they are not applicable to my case. SomeClass and MyApplet are in the same jar and the page is being accessed locally.

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• Scrollbars in ScrollView not showing after custom child view changes size

  - by Ted Hopp

  I have a ScrollView containing a client that is a vertical LinearLayout. The client, in turn, contains custom views that change height dynamically as a background thread does some work. The problem I'm having is that the ScrollView's vertical scroll bar is not updating correctly in Android 1.5. The most common problem occurs when the initial total height of the client is less than the viewport and grows. Initially there is no scroll bar, and it does not show up when the client grows until I actually scroll the window with a touch gesture or other UI action. After that, the scroll bar shows up. However, the thumb does not update as the height continues to change from the background thread. If I scroll the view again through the UI, the thumb immediately corrects itself. My code for updating the height from the background thread is: post(mLayoutRequestor); postInvalidate(); (mLayoutRequestor is a Runnable that just calls requestLayout().) This is done after I've recorded the new height in a variable mHeight. My onMeasure() method calls setMeasuredDimension with a height computed like this: private int measureHeight(int measureSpec) { int result; int specMode = MeasureSpec.getMode(measureSpec); int specSize = MeasureSpec.getSize(measureSpec); if (specMode == MeasureSpec.EXACTLY) { result = specSize; } else { result = mHeight; if (specMode == MeasureSpec.AT_MOST && result > specSize) result = specSize; } return result; } Am I supposed to be calling something else besides requestLayout() to get the scroll bar to update correctly?

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• Using SetParent to steal the main window of another process but keeping the message loops separate

  - by insta

  Background: My coworker and I are maintaining a million-line legacy application we inherited. Its frontend is written in VB6, and as we're devoting almost all of our resources to converting it to C#, we are looking for quick & dirty solutions to our specific problem. The application behaves in a plugin-ish manner. There are up to 20ish separate ActiveX controls that can be loaded at once in a grid-style layout. The problem is that the ActiveX controls do all of their processing on their own UI thread, and as a lot of it is blocking waiting on network access, the UI gets very soupy. When our hosting C# app loads these controls, it becomes unresponsive because of how many controls are chewing up UI resources doing nothing. To top it off, the controls are fragile and will crash at the slightest provocation. When they are hosted in the main C# app, it creates serious instability. The best my coworker and I have come up with so far is starting a process per ActiveX control. This process, which we call the proxy, is another winforms app. It uses named pipes to communicate with the hosting process. The hosting process creates a window, loads an ActiveX control of our choice (via some reflections & AxHost magic), and tells the main process what its window handle is via the named pipe. The main process uses a combination of SetParent, and SetWindowPos to move the proxy application into itself to emulate a plugin. Size updates are sent via the named pipe. This works well enough until the ActiveX application does some sort of lengthy process and we click around on the main window while it's working. For awhile the main window is responsive, but eventually it becomes unresponsive as the child window waits for its UI thread. How can we keep the child windows on their own complete thread while still getting the benefits of SetParent? (please let me know if anything isn't clear!)

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• Very strange Application.ThreadException behaviour.

  - by Brann

  I'm using the Application.ThreadException event to handle and log unexpected exceptions in my winforms application. Now, somewhere in my application, I've got the following code (or rather something equivalent, but this dummy code is enough to reproduce my issue) : try { throw new NullReferenceException("test"); } catch (Exception ex) { throw new Exception("test2", ex); } I'm clearly expecting my Application_ThreadException handler to be passed the "test2" exception, but this is not always the case. Typically, if another thread marshals my code to the UI, my handler receives the "test" exception, exactly as if I hadn't caught "test" at all. Here is a short sample reproducing this behavior. I have omitted the designer's code. static class Program { [STAThread] static void Main() { Application.ThreadException += new System.Threading.ThreadExceptionEventHandler(Application_ThreadException); Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); Application.Run(new Form1()); } static void Application_ThreadException(object sender, System.Threading.ThreadExceptionEventArgs e) { Console.WriteLine(e.Exception.Message); } } public partial class Form1 : Form { public Form1() { InitializeComponent(); button1.Click+=new EventHandler(button1_Click); System.Threading.Thread t = new System.Threading.Thread(new System.Threading.ThreadStart(ThrowEx)); t.Start(); } private void button1_Click(object sender, EventArgs e) { try { throw new NullReferenceException("test"); } catch (Exception ex) { throw new Exception("test2", ex); } } void ThrowEx() { this.BeginInvoke(new EventHandler(button1_Click)); } } The output of this program on my computer is : test ... here I click button1 test2 I've reproduced this on .net 2.0,3.5 and 4.0. Does someone have a logical explanation ?

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• Store the cache data locally

  - by Lu Lu

  Hello, I develops a C# Winform application, it is a client and connect to web service to get data. The data returned by webservice is a DataTable. Client will display it on a DataGridView. My problem is that: Client will take more time to get all data from server (web service is not local with client). So I must to use a thread to get data. This is my model: Client create a thread to get data - thread complete and send event to client - client display data on datagridview on a form. However, when user closes the form, user can open this form in another time, and client must get data again. This solution will cause the client slowly. So, I think about a cached data: Client <---get/add/edit/delete--- Cached Data ---get/add/edit/delete---Server (web service) Please give me some suggestions. Example: cached data should be developed in another application which is same host with client? Or cached data is running in client. Please give me some techniques to implement this solution. If having any examples, please give me. Thanks.

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• Problem when get pageContent of URL in java ?

  - by tiendv

  Hi all ! i have a code for get pagecontent from a URL here is code ! import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.URL; import java.net.URLConnection; public class GetPageFromURLAction extends Thread { public String stringPageContent; public String targerURL; public String getPageContent(String targetURL) throws IOException { String returnString=""; URL urlString = new URL(targetURL); URLConnection openConnection = urlString.openConnection(); String temp; BufferedReader in = new BufferedReader(new InputStreamReader(openConnection.getInputStream())); while ((temp = in.readLine()) != null) { returnString += temp + "\n"; } in.close(); // String nohtml = sb.toString().replaceAll("\\<.*?>",""); return returnString; } public String getStringPageContent() { return stringPageContent; } public void setStringPageContent(String stringPageContent) { this.stringPageContent = stringPageContent; } public String getTargerURL() { return targerURL; } public void setTargerURL(String targerURL) { this.targerURL = targerURL; } @Override public void run() { try { this.stringPageContent=this.getPageContent(targerURL); } catch (IOException e) { e.printStackTrace(); } } } The problem is : 1 Some time i receive a error lik 405 ,or 403 HTTP error ... and result string is null . To repair i check permission to connect URL but it usualy return null URLConnection openConnection = urlString.openConnection(); openConnection.getPermission( ) is mean that i don't have permission to acess link ? To get resultString without HTML Tag ? i do like that String nohtml = sb.toString().replaceAll("\<.*?",""); Para sb is Stringbulder , but it can't remove all HTML Tab in string return ? I use thread here because i must get page alot of url , so how can i cread a multi thread to impro speed of program ! Thanks

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• Determining when stringByEvaluatingJavaScriptFromString has finished

  - by alku83

  I have a UIWebView which loads up an HTML page. This page has two buttons on it, say Exit and Submit. I don't want users to be able to click the Exit button, so once the page has finished loading (ie. webViewDidFinishLoad is called), I use stringByEvaluatingJavaScriptFromString to remove one of these buttons, by manipulating the HTML. I also disable user interaction on the UIWebView on webViewDidStartLoad, and enable it again on webViewDidFinishLoad. The problem I am finding is that stringByEvaluatingJavaScriptFromString takes a second or two to complete, and it seems to be done in it's own thread. So what is happening is that webViewDidFinishLoad is called, user interaction is enabled on the UIWebView, and if the user is quick, they can click the Exit button before stringByEvaluatingJavaScriptFromString has finished. As stringByEvaluatingJavaScriptFromString seems to be on it's own thread with no way to know when it's finished (it doesnt call webViewDidFinishLoad), the only way to completely prevent users from tapping the Exit button that I can see is to only enable user interaction on the UIWebView after some delay, which is unreliable (how can I really know how long to delay for?). Am I correct in that stringByEvaluatingJavaScriptFromString is done on it's on thread, and I have no way of being able to tell when it's finished? Any other suggestions for how to get around this problem? EDIT: In short, what I want to know is if it is possible to disable a UIWebView while stringByEvaluatingJavaScriptFromString is executing, and re-enable the UIWebView when the javascript is finished. EDIT 2: There's an article here which seems to imply you can somehow poll the JS engine to see when it's finished, but I can't find any other references saying the same thing: http://drnicwilliams.com/2008/11/10/to-webkit-or-not-to-webkit-within-your-iphone-app/ EDIT 3 Based on the answer from Brad Smith, it seems that I actually need to know when the UIWebView has finished loading itself after the javascript has executed. It's looking more and more like I just need to put a delay of sorts in there.

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• Bluetooth in Java Mobile: Handling connections that go out of range

  - by Albus Dumbledore

  I am trying to implement a server-client connection over the spp. After initializing the server, I start a thread that first listens for clients and then receives data from them. It looks like that: public final void run() { while (alive) { try { /* * Await client connection */ System.out.println("Awaiting client connection..."); client = server.acceptAndOpen(); /* * Start receiving data */ int read; byte[] buffer = new byte[128]; DataInputStream receive = client.openDataInputStream(); try { while ((read = receive.read(buffer)) > 0) { System.out.println("[Recieved]: " + new String(buffer, 0, read)); if (!alive) { return; } } } finally { System.out.println("Closing connection..."); receive.close(); } } catch (IOException e){ e.printStackTrace(); } } } It's working fine for I am able to receive messages. What's troubling me is how would the thread eventually die when a device goes out of range? Firstly, the call to receive.read(buffer) blocks so that the thread waits until it receives any data. If the device goes out of range, it would never proceed onward to check if meanwhile it has been interrupted. Secondly, it would never close the connection, i.e. the server would not accept the device once it goes back in range. Thanks! Any ideas would be highly appreciated! Merry Christmas!

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• Request-local storage in ASP.NET (accessible to the code from IHttpModule implementation)

  - by IgorK

  I need to have some object hanging around between two events I'm interested in: PreRequestHandlerExecute (where I create an instance of my object and want to save it) and PostRequestHandlerExecute (where I want to get to the object). After the second event the object is not needed for my purposes and should be discarded either by storage or my explicit action. So the ideal context where my object should be stored is per request (with guaranteed no sharing issues when different threads are serving requests... or processes/servers :) ) Take into account that actual implementation I can do is being made from a HttpModule and is supposed to be a pluggable solution for already written web apps (so the option to provide some state using static/instance variables in Global.asax doesn't look good - I will have to modify Global.asax on every web application). Cache seems to be too broad for this use. I tried to see whether httpContext.Application (of type HttpApplicationState) is good for me or not, but cannot get whether it is exactly per HttpApplication instance or not (AFAIK you can have several instances of HttpApplications used on different threads and therefore serving several requests simultaneously - then using storage shared between threads will not work correctly; otherwise I would use it because one HttpApplication instance serves exactly one request at a time). Something could be done with storing state on the HttpModule instances if I know for sure that it's exactly bound 1-to-1 with every HttpApplication instance running (but again I need a proof that HttpApplication instance is 1-to-1 with my HttpModule's instance). Any valuable and reputable links on these topics are much appreciated... Would be great to find something particularly well-suited for per request situation (because otherwise I may end up with something ulgy... probably either some 'broader' scoped storage and some hacks to have different keys in the storage for different requests, OR using a thread-local thing and in this way commit to the theory that IIS/ASP.NET will not ever serve first event from one thread and the second event from the other thread and so on)

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• Multi-threaded library calls in ASP.NET page request.

  - by ProfK

  I have an ASP.NET app, very basic, but right now too much code to post if we're lucky and I don't have to. We have a class called ReportGenerator. On a button click, method GenerateReports is called. It makes an async call to InternalGenerateReports using ThreadPool.QueueUserWorkItem and returns, ending the ASP.NET response. It doesn't provide any completion callback or anything. InternalGenerateReports creates and maintains five threads in the threadpool, one report per thread, also using QueueUserWorkItem, by 'creating' five threads, also with and waiting until calls on all of them complete, in a loop. Each thread uses an ASP.NET ReportViewer control to render a report to HTML. That is, for 200 reports, InternalGenerateReports should create 5 threads 40 times. As threads complete, report data is queued, and when all five have completed, report data is flushed to disk. My biggest problems are that after running for just one report, the aspnet process is 'hung', and also that at around 200 reports, the app just hangs. I just simplified this code to run in a single thread, and this works fine. Before we get into details like my code, is there anything obvious in the above scendario that might be wrong?

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• Correct way to do timer function in Python

  - by bwawok

  Hi. I have a GUI application that needs to do something simple in the background (update a wx python progress bar, but that doesn't really matter). I see that there is a threading.timer class.. but there seems to be no way to make it repeat. So if I use the timer, I end up having to make a new thread on every single execution... like : import threading import time def DoTheDew(): print "I did it" t = threading.Timer(1, function=DoTheDew) t.daemon = True t.start() if __name__ == '__main__': t = threading.Timer(1, function=DoTheDew) t.daemon = True t.start() time.sleep(10) This seems like I am making a bunch of threads that do 1 silly thing and die.. why not write it as : import threading import time def DoTheDew(): while True: print "I did it" time.sleep(1) if __name__ == '__main__': t = threading.Thread(target=DoTheDew) t.daemon = True t.start() time.sleep(10) Am I missing some way to make a timer keep doing something? Either of these options seems silly... I am looking for a timer more like a java.util.Timer that can schedule the thread to happen every second... If there isn't a way in Python, which of my above methods is better and why?

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• Java Concurrency in practice sample question

  - by andy boot

  I am reading "Java Concurrency in practice" and looking at the example code on page 51. This states that if a thread has references to a shared object then other threads may be able to access that object before the constructor has finished executing. I have tried to put this into practice and so I wrote this code thinking that if I ran it enough times a RuntimeException("World is f*cked") would occur. But it isn't doing. Is this a case of the Java spec not guaranting something but my particular implementation of java guaranteeing it for me? (java version: 1.5.0 on Ubuntu) Or have I misread something in the book? Code: (I expect an exception but it is never thrown) public class Threads { private Widgit w; public static void main(String[] s) throws Exception { while(true){ Threads t = new Threads(); t.runThreads(); } } private void runThreads() throws Exception{ new Checker().start(); w = new Widgit((int)(Math.random() * 100) + 1); } private class Checker extends Thread{ private static final int LOOP_TIMES = 1000; public void run() { int count = 0; for(int i = 0; i < LOOP_TIMES; i++){ try { w.checkMe(); count++; } catch(NullPointerException npe){ //ignore } } System.out.println("checked: "+count+" times out of "+LOOP_TIMES); } } private static class Widgit{ private int n; private int n2; Widgit(int n) throws InterruptedException{ this.n = n; Thread.sleep(2); this.n2 = n; } void checkMe(){ if (n != n2) { throw new RuntimeException("World is f*cked"); } } } }

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• Class initialization and synchronized class method

  - by nybon

  Hi there, In my application, there is a class like below: public class Client { public synchronized static print() { System.out.println("hello"); } static { doSomething(); // which will take some time to complete } } This class will be used in a multi thread environment, many threads may call the Client.print() method simultaneously. I wonder if there is any chance that thread-1 triggers the class initialization, and before the class initialization complete, thread-2 enters into print method and print out the "hello" string? I see this behavior in a production system (64 bit JVM + Windows 2008R2), however, I cannot reproduce this behavior with a simple program in any environments. In Java language spec, section 12.4.1 (http://java.sun.com/docs/books/jls/second_edition/html/execution.doc.html), it says: A class or interface type T will be initialized immediately before the first occurrence of any one of the following: T is a class and an instance of T is created. T is a class and a static method declared by T is invoked. A static field declared by T is assigned. A static field declared by T is used and the reference to the field is not a compile-time constant (§15.28). References to compile-time constants must be resolved at compile time to a copy of the compile-time constant value, so uses of such a field never cause initialization. According to this paragraph, the class initialization will take place before the invocation of the static method, however, it is not clear if the class initialization need to be completed before the invocation of the static method. JVM should mandate the completion of class initialization before entering its static method according to my intuition, and some of my experiment supports my guess. However, I did see the opposite behavior in another environment. Can someone shed me some light on this? Any help is appreciated, thanks.

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• UDP server doesnt accept calls from outside.

  - by rayman

  Hi, ive implement simple udp server on my Android device.(sdk 1.5) it works fine when i am runnning a local client on the phone sends through it trigger to my server. but when i try to get udp call from an outside server to my phone, it doesnt work. already make sure the outside server isnt blocked by firewall and it's sending the udp trigger to the right port, which my phone is listening to. i used natstat on the phone and checked that the phone is realy listening to the it's local ip and the port ive setted it to. here is my code of the server:(on the device) // server will listen to one client try { Thread udpServerThread = new Thread() { @Override public void run() { try { // Retrieve the ServerName InetAddress serverAddr = InetAddress .getByName("localhost"); Log.d("UDP", "S: Connecting..."); // Create new UDP-Socket socket = new DatagramSocket(SERVERPORT,serverAddr); byte[] buf = new byte[17]; // * Prepare a UDP-Packet that can contain the data we // * want to receive DatagramPacket packet = new DatagramPacket(buf, buf.length); Log.d("UDP", "S: Receiving..."); // wait to Receive the UDP-Packet socket.receive(packet); Log.d("UDP", "S: Received: '" + new String(packet.getData()) + "'"); acceptedMsg=new String(packet.getData()); notifyService(acceptedMsg); Log.d("UDP", "S: Done."); } catch (Exception e) { Log.e("UDP", "S: Error", e); } } }; udpServerThread.start(); } catch (Exception E) { Log.e("r",E.getMessage()) ; } so as i said, when i try it with local client(seperate thread) which sends udp trigger it works fine, but when i take this client implementation and put it on an outside real server, after UDP being sent, the phone doesnt respond to it. any idea? thanks, ray.

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• C#, Can I check on a lock without trying to acquire it?

  - by Biff MaGriff

  Hello, I have a lock in my c# web app that prevents users from running the update script once it has started. I was thinking I would put a notification in my master page to let the user know that the data isn't all there yet. Currently I do my locking like so. protected void butRefreshData_Click(object sender, EventArgs e) { Thread t = new Thread(new ParameterizedThreadStart(UpdateDatabase)); t.Start(this); //sleep for a bit to ensure that javascript has a chance to get rendered Thread.Sleep(100); } public static void UpdateDatabase(object con) { if (Monitor.TryEnter(myLock)) { Updater.RepopulateDatabase(); Monitor.Exit(myLock); } else { Common.RegisterStartupScript(con, AlreadyLockedJavaScript); } } And I do not want to do if(Monitor.TryEnter(myLock)) Monitor.Exit(myLock); else //show processing labal As I imagine there is a slight possibility that it might display the notification when it isn't actually running. Is there an alternative I can use? Edit: Hi Everyone, thanks a lot for your suggestions! Unfortunately I couldn't quite get them to work... However I combined the ideas on 2 answers and came up with my own solution.

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