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  • C# Threads.Abort()

    - by Betamoo
    If a thread is running a function func1 that calls another function func2 inside it... Then I called thread.Abort() Will this stop func1 only OR func1 and func2 and all the functions func1 has called?? Thanks Edit: Here are more detail: func1 is called in a new thread, it continuously calls func2 on regular basis... func2 begin doing some work only if some array is not null.. it finishes it and return When supervisor wants to save data, it aborts Thread of func1- and then makes array null, saves data, then fill in the array with new one.. and starts Thread with func1 again.. Sometimes exception is raised because array is null in func2.. so func1 abort did not affect func2

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  • Need help understanding _set_security_error_handler()

    - by Emil D
    So , I've been reading this article: http://msdn.microsoft.com/en-us/library/aa290051%28VS.71%29.aspx And I would like to define my custom handler.However, I'm not sure I understand the mechanics well.What happens after a call is made to the user-defined function ( e.g. the argument of _set_security_error_handler() ) ? Does the program still terminate afterward ? If that is the case, is it possible to terminate only the current thread(assuming that it is not the main thread of the application).AFAIK, each thread has its own stack , so if the stack of a thread gets corrupted, the rest of the application shouldn't be affected. Finally, if it is indeed possible to only terminate the current thread of execution, what potential problems could such an action cause? I'm trying to do all this inside an unmanaged C++ dll that I would like to use in my C# code.

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  • Problem with Classes in Python..

    - by Gui
    Ok guys, I'm really new at python (and programming itself) so sorry for my ignorance, but I really needed to ask this. So im doing a wxPython project where I added several tabs for a notebook (each tab of the notebook = a class) and there is one tab where I added a checkbox (in a tab, lets call it for example Tab1), and what I want is that when someone checks it, a button that exists in other tab (class called for example tab2) gets hidden where previously it was being shown. Well I see that it isn't hard to accomplish this, but my problem is the classes (tab1 and tab2, in this example). I've been trying to figure it out by searching but I guess im not searching hard enough because I just can't get it right. If they were in the same class I wouldn't have a problem, but as they are in different classes, im having a huge struggle with this. Hope someone can help me, and sorry for my ignorance once again.

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  • rhino embedding

    - by neheh
    Anyone understands the rhino javascript Contexts? I cannot find any useful documentation about it. My main problem is the Context.exit() (really should be cx.exit()) which from what I understand exits the context associated with the current thread? Does that mean I need to keep track of what which thread does? main thread: Context cx; cx.evaluateReader( ... ) // load some function start thread 2 thread 2: Object o= scope.get("methodname", scope); ((Function)o).call( ... ) I do not plan on doing multithreading but what if the different setups comes from different threads?

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  • UIWebView in multithread ViewController

    - by Tao
    I have a UIWebView in a viewcontroller, which has two methods as below. The question is if I pop out(tap back on navigation bar) this controller before the second thread is done, the app will crash after [super dealloc], because "Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread.". Any help would be really appreciated. -(void)viewDidAppear:(BOOL)animated { [super viewWillAppear:animated]; NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(load) object:nil]; [operationQueue addOperation:operation]; [operation release]; } -(void)load { [NSThread sleepForTimeInterval:5]; [self performSelectorOnMainThread:@selector(done) withObject:nil waitUntilDone:NO]; }

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  • Issue with dynamic Quicklist in Unity

    - by costales
    I would like to add a Quicklist to Gufw app, but it isn't working. The code is here (you can install reading the INSTALL file): http://bazaar.launchpad.net/~gufw-developers/gui-ufw/testing/files/3 I added lines 52-54 to the view (a simple example) from the official API web: http://bazaar.launchpad.net/~gufw-developers/gui-ufw/testing/view/head:/gufw/view/gufw.py https://wiki.ubuntu.com/Unity/LauncherAPI self.launcher = Unity.LauncherEntry.get_for_desktop_id ("gufw.desktop") self.launcher.set_property("progress", 0.42) self.launcher.set_property("progress_visible", True) But nothing happen. But if I run this file with Gufw running: http://bazaar.launchpad.net/~gufw-developers/gui-ufw/testing/view/head:/gufw/test_launcher.py $ python test_launcher.py The progress bar appears! :/ I don't know what am I missing? :P Any idea? Thanks in advance! The environment is Ubuntu 13.04.

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  • Quickly and Python Twisted

    - by Aaron
    I am creating a Quickly application that makes use of Python Twisted. When the user launches a window, I want to start the Twisted server I wrote. However, when I do this, it freezes the GUI, because the reactor.run method is constantly running after it is started. I need a way to start the Twisted reactor in its own thread, so that the GUI will continue to operate while the reactor is running. I have read about using Twisted with pyGTK in the Twisted documentation, but I am not sure how I would accomplish this with a Quickly application. What is the best way to start my Twisted server when a window opens without freezing the GUI? Update: My if __name__ == '__main__' statement at the end of my dialog file is: print 'Preparing GLib' GLib.idle_add(before_running) print 'Staring Reactor' from twisted.internet import reactor reactor.run()` I have imported and installed twisted.gtk3reactor earlier on in the file. The before_running method contains dialog = ClientDialog() and dialog.show, as well as the rest of the code I want to run when the dialog opens.

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  • Threading multiple WebBrowser in VB .net

    - by Code_Seeker
    I'm building a multiple webbrowser inside tabs( 1 predefine webbrowser control per tab) and I want them all to load at the same time or other words must run in thread. Unfortunately I feel a valid fact came from the error message that this is something not possible. Pls help me to check my simple program code below and its error in case i tried releasing 2 webbrowser controls but when I leave it to single web browser control it works fine. Any workaround? Imports System.Threading Public Class Form1 Dim mythread1 As Thread Dim mythread2 As Thread Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load mythread1 = New Thread(AddressOf mysub1) mythread2 = New Thread(AddressOf mysub2) mythread1.IsBackground = True mythread2.IsBackground = True mythread1.Start() mythread2.Start() End Sub Public Sub mysub1() Dim HTML As String WebBrowser1.Navigate("about:blank") mythread1.Abort() End Sub Public Sub mysub2() WebBrowser2.Navigate("about:blank") mythread2.Abort() End Sub

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  • passing multiple queries to view with codeigniter

    - by LvS
    I am trying to build a forum with Codeigniter. So far i have the forums themselves displayed and the threads displayed, based on the creating dynamic news tutorial. But that is 2 different pages, i need to obviously display them into one page, like this: Forum 1 - thread 1 - thread 2 - thread 3 Forum 2 - thread 1 - thread 2 etc. And then the next step is obviously to display all the posts in a thread. Most likely with some pagination going on. But that is for later. For now i have the forum controller (slimmed version): <?php class Forum extends CI_Controller { public function __construct() { parent::__construct(); $this->load->model('forum_model'); $this->lang->load('forum'); $this->lang->load('dutch'); } public function index() { $data['forums'] = $this->forum_model->get_forums(); $data['title'] = $this->lang->line('title'); $data['view'] = $this->lang->line('view'); $this->load->view('templates/header', $data); $this->load->view('forum/index', $data); $this->load->view('templates/footer'); } public function view($slug) { $data['forum_item'] = $this->forum_model->get_forums($slug); if (empty($data['forum_item'])) { show_404(); } $data['title'] = $data['forum_item']['title']; $this->load->view('templates/header', $data); $this->load->view('forum/view', $data); $this->load->view('templates/footer'); } } ?> And the forum_model (also slimmed down) <?php class Forum_model extends CI_Model { public function __construct() { $this->load->database(); } public function get_forums($slug = FALSE) { if ($slug === FALSE) { $query= $this->db->get('forum'); return $query->result_array(); } $query = $this->db->get_where('forum', array('slug' => $slug)); return $query->row_array(); } public function get_threads($forumid, $limit, $offset) { $query = $this->db->get_where('thread', array('forumid', $forumid), $limit, $offset); return $query->result_array(); } } ?> And the view file <?php foreach ($forums as $forum_item): ?> <h2><?=$forum_item['title']?></h2> <div id="main"> <?=$forum_item['description']?> </div> <p><a href="forum/<?php echo $forum_item['slug'] ?>"><?=$view?></a></p> <?php endforeach ?> Now that last one, i would like to have something like this: <?php foreach ($forums as $forum_item): ?> <h2><?=$forum_item['title']?></h2> <div id="main"> <?=$forum_item['description']?> </div> <?php foreach ($threads as $thread_item): ?> <h2><?php echo $thread_item['title'] ?></h2> <p><a href="thread/<?php echo $thread_item['slug'] ?>"><?=$view?></a></p> <?php endforeach ?> <?php endforeach ?> But the question is, how do i get the model to return like a double query to the view, so that it contains both the forums and the threads within each forum. I tried to make a foreach loop in the get_forum function, but when i do this: public function get_forums($slug = FALSE) { if ($slug === FALSE) { $query= $this->db->get('forum'); foreach ($query->row_array() as $forum_item) { $thread_query=$this->get_threads($forum_item->forumid, 50, 0); } return $query->result_array(); } $query = $this->db->get_where('forum', array('slug' => $slug)); return $query->row_array(); } i get the error A PHP Error was encountered Severity: Notice Message: Trying to get property of non-object Filename: models/forum_model.php Line Number: 16 I hope anyone has some good tips, thanks! Lenny *EDIT*** Thanks for the feedback. I have been puzzling and this seems to work now :) $query= $this->db->get('forum'); foreach ($query->result() as $forum_item) { $forum[$forum_item->forumid]['title']=$forum_item->title; $thread_query=$this->db->get_where('thread', array('forumid' => $forum_item->forumid), 20, 0); foreach ($thread_query->result() as $thread_item) { $forum[$forum_item->forumid]['thread'][]=$thread_item->title; } } return $forum; } What is now next, is how to display this multidimensional array in the view, with foreach statements.... Any suggestions ? Thanks

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  • Cannot mount USB disks due to "not authorized" error

    - by shadovv
    I have Ubuntu 12.04 (.2?) installed. I don't plan to need GUI after setup so I modified the grub to start in console. However, whenever I want to start up GUI I need to type startx. Simple/basic stuff. However I seem to be hitting a snag: I am having trouble mounting/accessing USB flash drives in the GUI I started in the console. "Unable to mount location - not authorized". Seemed like it should be an easy fix, but can't figure out how I'm overlooking it. Can someone help me out?

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  • In MAYA 2009, is it possible to capture the cube rotate event?

    - by Rahul2047
    I need to call a function ( Maya-Python ) based on cube rotationX. For that I have to capture the event, programmatically. I tried using while loop but It stucks in the loop, Nothing can be done in that time. I tried theading (python), still same. Can it be done this or other way? If yes, How? Maya 2009 in Windows XP Some failed code references: import maya.cmds as cmds while (count < 90): lock = cmds.getAttr('pCube1.rotateX',lock=False) print lock count = count + 1 Here Python wise: #!/usr/bin/python import thread import time # Define a function for the thread def cubeRotateX( threadName, delay): count = 0 while count < 5: time.sleep(delay) count += 1 try: thread.start_new_thread( cubeRotateX, ("Thread-1", 2, ) ) except: print "Error: unable to start thread" while 1: pass

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  • How refresh a DrawingArea in PyGTK ?

    - by Lialon
    I have an interface created with Glade. It contains a DrawingArea and buttons. I tried to create a Thread to refresh every X time my Canva. After a few seconds, I get error messages like: "X Window Server 0.0", "Fatal Error IO 11" Here is my code : import pygtk pygtk.require("2.0") import gtk import Canvas import threading as T import time import Map gtk.gdk.threads_init() class Interface(object): class ThreadCanvas(T.Thread): """Thread to display the map""" def __init__(self, interface): T.Thread.__init__(self) self.interface = interface self.started = True self.start() def run(self): while self.started: time.sleep(2) self.interface.on_canvas_expose_event() def stop(self): self.started = False def __init__(self): self.interface = gtk.Builder() self.interface.add_from_file("interface.glade") #Map self.map = Map.Map(2,2) #Canva self.canvas = Canvas.MyCanvas(self.interface.get_object("canvas"),self.game) self.interface.connect_signals(self) #Thread Canvas self.render = self.ThreadCanvas(self) def on_btnChange_clicked(self, widget): #Change map self.map.change() def on_interface_destroy(self, widget): self.render.stop() self.render.join() self.render._Thread__stop() gtk.main_quit() def on_canvas_expose_event(self): st = time.time() self.canvas.update(self.map) et = time.time() print "Canvas refresh in : %f times" %(et-st) def main(self): gtk.main() How can i fix these errors ?

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  • Can someone explain this java interface to me please?

    - by Karl Patrick
    I realize that the method run must be declared because its declared in the runnable interface. But my question comes when this class runs how is the Thread object allowed if there is no import call to a particular package? how does runnable know anything about Thread or its methods? does the runnable interface extend the thread class? Obviously i dont understand interfaces very well. thanks in advance. class PrimeFinder implements Runnable{ public long target; public long prime; public boolean finished = false; public Thread runner; PrimeFinder(long inTarget){ target = inTarget; if(runner == null){ runner = new Thread(this); runner.start() } } public void run(){ } }

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  • Why doesn't Perl threading work when I call readdir beforehand?

    - by Kevin
    Whenever I call readdir before I create a thread, I get an error that looks like this: perl(2820,0x7fff70c33ca0) malloc: * error for object 0x10082e600: pointer being freed was not allocated * set a breakpoint in malloc_error_break to debug Abort trap What's strange is that it happens when I call readdir before I create a thread (i.e. readdir is not called in any concurrent code). I don't even use the results from readdir, just making the call to it seems to screw things up. When I get rid of it, things seem to work fine. Some example code is below: opendir(DIR, $someDir); my @allFiles = readdir(DIR); close(DIR); my $thread = threads-create(\&sub1); $thread-join(); sub sub1 { print "in thread\n" }

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  • Django + dbxml + Apache = problems. Any solutions?

    - by Jason
    I'm trying to set up a Django application using WSGI. That works fine. However, I am having some issues with part of my Django app that uses BDB XML. My Apache config is as follows: Listen 8000 WSGISocketPrefix /tmp/wsgi <VirtualHost *:8000> ServerName <server name> DocumentRoot <path to doc root> LogLevel info WSGIScriptAlias / <path to wsgi> WSGIApplicationGroup %{GLOBAL} WSGIDaemonProcess debug threads=1 WSGIProcessGroup debug </VirtualHost> However, I'm still getting the following error: DB_ENV->repmgr_stat interface requires an environment configured for the replication subsystem [error] child died with signal 11 My environment is opened as: environment = DBEnv() environment.open( <absolute db env path>, DB_CREATE|DB_INIT_LOCK|DB_INIT_LOG|DB_INIT_MPOOL, 0 ) I am using: python 2.6.2 apache 2.2 ubuntu 9.04 dbxml 2.5.13 compiled from source (so libdb-4.8, bsddb3, all that jazz) I see Apache seems to link to libdb-4.6. Is this a problem? ldd /usr/sbin/apache2 | grep libdb libdb-4.6.so => /usr/lib/libdb-4.6.so (0xb7c01000) Updated Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0xb5a48b90 (LWP 12700)] 0x00000000 in ?? () (gdb) thread apply all bt Thread 4 (Thread 0xb6a67b90 (LWP 12698)): #0 0xb7f11422 in __kernel_vsyscall () #1 0xb7de07b1 in select () from /lib/tls/i686/cmov/libc.so.6 #2 0xb7ea5bcf in apr_sleep () from /usr/lib/libapr-1.so.0 #3 0xb6d7afee in ?? () from /usr/lib/apache2/modules/mod_wsgi.so #4 0xb7ea38ec in ?? () from /usr/lib/libapr-1.so.0 #5 0xb7e6d4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0 #6 0xb7de849e in clone () from /lib/tls/i686/cmov/libc.so.6 Thread 3 (Thread 0xb6249b90 (LWP 12699)): #0 0xb7f11422 in __kernel_vsyscall () #1 0xb7de07b1 in select () from /lib/tls/i686/cmov/libc.so.6 #2 0xb7ea5bcf in apr_sleep () from /usr/lib/libapr-1.so.0 #3 0xb6d7ab39 in ?? () from /usr/lib/apache2/modules/mod_wsgi.so #4 0xb7ea38ec in ?? () from /usr/lib/libapr-1.so.0 #5 0xb7e6d4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0 #6 0xb7de849e in clone () from /lib/tls/i686/cmov/libc.so.6 Thread 2 (Thread 0xb5a48b90 (LWP 12700)): #0 0x00000000 in ?? () #1 0xb4f03b5e in DbXml::XmlManager::XmlManager () from /home/jason/dbxml-2.5.13/install/lib/libdbxml-2.5.so #2 0xb501b29b in _wrap_new_XmlManager (self=0x0, args=0xac66fcc) at dbxml_python_wrap.cpp:5183 #3 0xb6b77aed in PyCFunction_Call () from /usr/lib/libpython2.6.so.1.0 #4 0xb6b3198c in PyObject_Call () from /usr/lib/libpython2.6.so.1.0 #5 0xb6bd70b5 in PyEval_EvalFrameEx () from /usr/lib/libpython2.6.so.1.0 #6 0xb6bdb910 in PyEval_EvalCodeEx () from /usr/lib/libpython2.6.so.1.0 #7 0xb6b6187a in ?? () from /usr/lib/libpython2.6.so.1.0 #8 0xb6b3198c in PyObject_Call () from /usr/lib/libpython2.6.so.1.0 #9 0xb6b427a8 in ?? () from /usr/lib/libpython2.6.so.1.0 #10 0xb6b3198c in PyObject_Call () from /usr/lib/libpython2.6.so.1.0 #11 0xb6b9ae03 in ?? () from /usr/lib/libpython2.6.so.1.0 #12 0xb6b90f55 in ?? () from /usr/lib/libpython2.6.so.1.0 #13 0xb6b3198c in PyObject_Call () from /usr/lib/libpython2.6.so.1.0 #14 0xb6bd7618 in PyEval_EvalFrameEx () from /usr/lib/libpython2.6.so.1.0 #15 0xb6bdb910 in PyEval_EvalCodeEx () from /usr/lib/libpython2.6.so.1.0 #16 0xb6b6187a in ?? () from /usr/lib/libpython2.6.so.1.0 #17 0xb6b3198c in PyObject_Call () from /usr/lib/libpython2.6.so.1.0 #18 0xb6b427a8 in ?? () from /usr/lib/libpython2.6.so.1.0 #19 0xb6b3198c in PyObject_Call () from /usr/lib/libpython2.6.so.1.0 #20 0xb6bd3a34 in PyEval_CallObjectWithKeywords () from /usr/lib/libpython2.6.so.1.0 #21 0xb6b44a7d in PyInstance_New () from /usr/lib/libpython2.6.so.1.0 #22 0xb6b3198c in PyObject_Call () from /usr/lib/libpython2.6.so.1.0 #23 0xb6bd7618 in PyEval_EvalFrameEx () from /usr/lib/libpython2.6.so.1.0 #24 0xb6bdb910 in PyEval_EvalCodeEx () from /usr/lib/libpython2.6.so.1.0 #25 0xb6b61969 in ?? () from /usr/lib/libpython2.6.so.1.0 #26 0xb6b3198c in PyObject_Call () from /usr/lib/libpython2.6.so.1.0 #27 0xb6bd70b5 in PyEval_EvalFrameEx () from /usr/lib/libpython2.6.so.1.0 #28 0xb6bdb910 in PyEval_EvalCodeEx () from /usr/lib/libpython2.6.so.1.0 #29 0xb6b61969 in ?? () from /usr/lib/libpython2.6.so.1.0 #30 0xb6b3198c in PyObject_Call () from /usr/lib/libpython2.6.so.1.0 #31 0xb6b427a8 in ?? () from /usr/lib/libpython2.6.so.1.0 #32 0xb6b3198c in PyObject_Call () from /usr/lib/libpython2.6.so.1.0 #33 0xb6b9b483 in ?? () from /usr/lib/libpython2.6.so.1.0 #34 0xb6b3198c in PyObject_Call () from /usr/lib/libpython2.6.so.1.0 #35 0xb6bd70b5 in PyEval_EvalFrameEx () from /usr/lib/libpython2.6.so.1.0 #36 0xb6bdab4f in PyEval_EvalFrameEx () from /usr/lib/libpython2.6.so.1.0 #37 0xb6bdb910 in PyEval_EvalCodeEx () from /usr/lib/libpython2.6.so.1.0 #38 0xb6b6187a in ?? () from /usr/lib/libpython2.6.so.1.0 #39 0xb6b3198c in PyObject_Call () from /usr/lib/libpython2.6.so.1.0 #40 0xb6b427a8 in ?? () from /usr/lib/libpython2.6.so.1.0 #41 0xb6b3198c in PyObject_Call () from /usr/lib/libpython2.6.so.1.0 #42 0xb6b9b483 in ?? () from /usr/lib/libpython2.6.so.1.0 #43 0xb6b3198c in PyObject_Call () from /usr/lib/libpython2.6.so.1.0 #44 0xb6bd3a34 in PyEval_CallObjectWithKeywords () from /usr/lib/libpython2.6.so.1.0 #45 0xb6d7172d in ?? () from /usr/lib/apache2/modules/mod_wsgi.so #46 0xb6d7539f in ?? () from /usr/lib/apache2/modules/mod_wsgi.so #47 0xb6d7e1d8 in ?? () from /usr/lib/apache2/modules/mod_wsgi.so #48 0xb6d7a42c in ?? () from /usr/lib/apache2/modules/mod_wsgi.so #49 0xb6d7a8bd in ?? () from /usr/lib/apache2/modules/mod_wsgi.so #50 0xb6d7a9c5 in ?? () from /usr/lib/apache2/modules/mod_wsgi.so #51 0xb7ea38ec in ?? () from /usr/lib/libapr-1.so.0 #52 0xb7e6d4ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0 #53 0xb7de849e in clone () from /lib/tls/i686/cmov/libc.so.6 Thread 1 (Thread 0xb7460b00 (LWP 12697)): #0 0xb7f11422 in __kernel_vsyscall () #1 0xb7e75300 in sigwait () from /lib/tls/i686/cmov/libpthread.so.0 #2 0xb7ea3f3b in apr_signal_thread () from /usr/lib/libapr-1.so.0 #3 0xb6d7b48d in ?? () from /usr/lib/apache2/modules/mod_wsgi.so #4 0xb6d7bc98 in ?? () from /usr/lib/apache2/modules/mod_wsgi.so #5 0xb6d79632 in ?? () from /usr/lib/apache2/modules/mod_wsgi.so #6 0xb7e9a2c9 in apr_proc_other_child_alert () from /usr/lib/libapr-1.so.0 #7 0x08092202 in ap_mpm_run () #8 0x080673c8 in main () #0 0x00000000 in ?? ()

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  • Continue with Java for pc or go to android? [on hold]

    - by Chris London
    so I have been learning java from Deitel's learn java 9th edition. I am up to GUI's and a have a pretty good grasp on OOP etc. I want to go straight to the mobile app development scene, I believe I will learn a fair bit there on using API's, and other tools to develop apps. I am not sure weather I should carry on with PC coding (GUI's etc etc) or skip it all and go direct to learning the Android SDK. So, should I carry on, learn about sockets, writing and reading files, GUI's for PC etc or get a book and jump into android? Thanks a lot guys.

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  • C# Threading and Sql Connections

    - by Jonathan M
    I have a method that attempts to update a sql server database in an ASP.NET application. If the update fails, it catches the exception and then queues the update in MSMQ, and then spins up a new thread that will later de-queue the pending update and try again. When the thread starts, it fails to open a database connection because it is attempting to connect using Network Service as the login. The sql connection is using Windows Authentication, and will work outside of the thread. If I put a breakpoint in the code that executes inside the new thread and check the Thread.CurrentPrincipal, it shows the Identity as being the correct user. Why is the sql connection attempting to be opened by the Network Service account? I can elaborate further is necessary. Thanks.

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  • What strategies are efficient to handle concurrent reads on heterogeneous multi-core architectures?

    - by fabrizioM
    I am tackling the challenge of using both the capabilities of a 8 core machine and a high-end GPU (Tesla 10). I have one big input file, one thread for each core, and one for the the GPU handling. The Gpu thread, to be efficient, needs a big number of lines from the input, while the Cpu thread needs only one line to proceed (storing multiple lines in a temp buffer was slower). The file doesn't need to be read sequentially. I am using boost. My strategy is to have a mutex on the input stream and each thread locks - unlocks it. This is not optimal because the gpu thread should have a higher precedence when locking the mutex, being the fastest and the most demanding one. I can come up with different solutions but before rush into implementation I would like to have some guidelines. What approach do you use / recommend ?

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  • What is the Ubuntu equivalent of the Windows programs Belarc or PC Wizard?

    - by CeltaWeb
    I provide technical support for several high schools in Spain and I have been building up a inventory of the schools machines. On the windows only computers I normally run PC Wizard to quickly get a good overview of the machines hardware, software and network settings. Is there an equivalent tool preferable with a GUI and an export option to html or pdf in Ubuntu. I have tried a few options such as: Gnomes gconf-editor hardinfo (GUI) lshw (CLI) I'm just looking for an all in one application that builds a detailed profile of the installed software, hardware and network setting of a particular machine. I have found Sysinfo which is quite good, it displays the most important hardware info and allows you to save it to a text file with a neat GUI. I'm still looking for a more complete solution but it's a good start.

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  • Qt Direct Connection

    - by user152508
    Hello I have created Qt tree control( and its nodes ) in different thread than the main thread. In the main thread I want to show context menu for the clicked node, so I am connectiong the actions in the menu with appropriate slots in the main thread. The connect function returns true , but slot is never executed. If I explicitly say in connect function that this is Qt :: DirectConnection then everything works fine. Why is this ? I I create my tree in main thread, everything also works fine , without having to say that this is Qt::DirectConnection .

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  • Install software with 12.04

    - by tigris
    Just freshly installed from 12.04 after using 11.04 and dist-upgrading to 11.10 a few months back, figured a fresh installation was due. First thing I noticed is that synaptic is no longer installed by default. I've no issues with this, and assume the approach to install packages is now via the ubuntu software center. However, I notice there are a lot of packages missing. I was looking for "vagrant", which I've had to install manually with a sudo apt-get install, but was hoping to use GUI for most things. Surely there is a GUI way? I also noticed when checking for "vim", it comes up with gVim and a little note at the bottom saying "show 2 technical items", which when clicked shows the vim I was looking for. Just curious what the expected GUI way is of installing these supposed "technical packages".

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  • What to use to wait on a indeterminate number of tasks?

    - by Scott Chamberlain
    I am still fairly new to parallel computing so I am not too sure which tool to use for the job. I have a System.Threading.Tasks.Task that needs to wait for n number number of tasks to finish before starting. The tricky part is some of its dependencies may start after this task starts (You are guaranteed to never hit 0 dependent tasks until they are all done). Here is kind of what is happening Parent thread creates somewhere between 1 and (NUMBER_OF_CPU_CORES - 1) tasks. Parent thread creates task to be run when all of the worker tasks are finished. Parent thread creates a monitoring thread Monitoring thread may kill a worker task or spawn a new task depending on load. I can figure out everything up to step 4. How do I get the task from step 2 to wait to run until any new worker threads created in step 4 finish?

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  • FileInputStream and FileOutputStream to the same file: Is a read() guaranteed to see all write()s that "happened before"?

    - by user946850
    I am using a file as a cache for big data. One thread writes to it sequentially, another thread reads it sequentially. Can I be sure that all data that has been written (by write()) in one thread can be read() from another thread, assuming a proper "happens-before" relationship in terms of the Java memory model? Is this behavior documented? EDIT: In my JDK, FileOutputSream does not override flush(), and OutputStream.flush() is empty. That's why I'm wondering... EDIT^2: The streams in question are owned exclusively by a class that I have full control of. Each stream is guaranteed to be accesses by one thread only. My tests show that it works as expected, but I'm still wondering if this is guaranteed and documented. See also this related discussion: http://chat.stackoverflow.com/rooms/17598/discussion-between-hussain-al-mutawa-and-user946850

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  • boost scoped_lock mutex crashes

    - by JahSumbar
    hello, I have protected a std::queue's access functions, push, pop, size, with boost::mutexes and boost::mutex::scoped_lock in these functions from time to time it crashes in a scoped lock the call stack is this: 0 0x0040f005 boost::detail::win32::interlocked_bit_test_and_set include/boost/thread/win32/thread_primitives.hpp 361 1 0x0040e879 boost::detail::basic_timed_mutex::timed_lock include/boost/thread/win32/basic_timed_mutex.hpp 68 2 0x0040e9d3 boost::detail::basic_timed_mutex::lock include/boost/thread/win32/basic_timed_mutex.hpp 64 3 0x0040b96b boost::unique_lock<boost::mutex>::lock include/boost/thread/locks.hpp 349 4 0x0040b998 unique_lock include/boost/thread/locks.hpp 227 5 0x00403837 MyClass::inboxSize - this is my inboxSize function that uses this code: MyClass::inboxSize () { boost::mutex::scoped_lock scoped_lock(m_inboxMutex); return m_inbox.size(); } and the mutex is declared like this: boost::mutex m_inboxMutex; it crashes at the last pasted line in this function: inline bool interlocked_bit_test_and_set(long* x,long bit) { long const value=1<<bit; long old=*x; and x has this value: 0xababac17 Thanks for the help

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  • How to elegantly work with a lot of print functions?

    - by user1824372
    I'm working on a Python project that is executed on a terminal (or console) for which I am planning to implement a GUI. I did not major in CS so I really have no idea how to effectively design a terminal GUI such that: the user interface looks good in GUI, it is directed to a certain widget, let's say, a text label, or a bottom bar, or a hide-able frame. Do you have any suggestions? Currently, I am using the print function to provide essential information on STDOUT during execution, so a lot of print calls are distributed here and there in the code. I'm thinking of using macro-like variables such as 'FILE_NOT_EXISTS_MESSAGE' for printing, and all of them and their values would be defined in one file. Is that a standard way to do this? Should I introduce a logging system? In summary, I'm looking for a pattern for handling console output that is effective and adaptable.

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