clone | 易学教程

Why realloc deadlock after clone syscall?

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问题 I have a problem that realloc() deadlocks sometime after clone() syscall. My code is: #include <sched.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <sys/syscall.h> #include <sys/types.h> #include <linux/types.h> #define CHILD_STACK_SIZE 4096*4 #define gettid() syscall(SYS_gettid) #define log(str) fprintf(stderr, "[pid:%d tid:%d] "str, getpid(),gettid()) int clone_func(void *arg){ int *ptr=(int*)malloc(10); int i; for (i=1; i<200000; i++) ptr = realloc(ptr, sizeof(int)

Duplicating a JPanel - (Copy JPanel's static image to different JPanel)

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问题 I'm pretty new to swing and I would like to receive some help as Im stuck with a task. Current state: Im having a nice JFrame object (guiFrame) which is having two JPanel on it (tabsPanel and cardPanel)(one is a simple JPanel with buttons, the other has CardLayout which is switched by the tabsPanel buttons). Problem: The task is that if I press the button "Show" on tabsPanel I need to send the cardPanel to a different window (ShowFrame) as a static "image", while on the previous window the

JQuery change clone inputs to empty

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问题 I am trying to clone a class that contains inputs and textareas, and turn their values to nothing. var current = $(".item").last(); current.clone().insertAfter( current ); current.find('input,textarea').val(''); The problem is instead of clearing the cloned objects inputs and textareas, it clears the last class inputs and textareas before that. 回答1: Your code is modifying the current objects, not the cloned ones. Try something like this: var current = $(".item").last(); var cloned = current

When to use clone() and how actually addAll() and add() works

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问题 I am using Java with MySQL. There are about 60 transactions screens are there in my project. I had used add() and addAll() functions to copy an ArrayList . For example: List<Bean> a1 = new ArrayList<Bean>(); // and add some value List<Bean> a2 = new ArrayList<Bean>(); a2.addAll(a1); In this case: In most of the screens, there is no any issue on add() or addAll() functions, but for some screens, if made change on list a2 it also affects the a1 list. In these particular screens, clone concept

Clone div and rename element ids incrementally

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问题 Ok lets say I have div with form elements inside of it. I want to be able to clone that div with a button click using jQuery and add a version 2 of the form, so ALL of the element IDs will increment by 1 in their name. <div id="card">  <h1 class="card_build">Build your card options:</h1> <select id="country" name="country[]"> <?php include('lib/class_dbcon.php'); $connect = new doConnect(); $q = mysql_query("SELECT * FROM country ORDER BY country_id ASC"); while($row = mysql

Symfony2 Cloning entities with collections and entity field type

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问题 I have object A which contains a collection of objects B which in turn contain a collection of objects C which again contains a collection of object D. I need to retrieve object A from DB, create a form from it, change some values in fields of the form (in the future also add and remove elements from the collections) and persist on DB a new object A with all the appropriate references to the new B, new C and new D. The object CVC below is my A. If I do: $storedCVC = $this->getDoctrine() -

Shallow AND Sparse GIT Repository Clone

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问题 I have a shallow cloned git repository that is over 1 GB. I use sparse checkout for the files/dirs needed. How can I reduce the repository clone to just the sparse checkout files/dirs? Initially I was able to limit the cloned repository to only the sparse checkout by disabling checkout when cloning. Then setting up sparse checkout before doing the initial checkout. This limited the repository to only about 200 MB. Much more manageable. However updating remote branch info at some point in the

How to git svn clone full history despite svn copy

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问题 In my company we are about to switch from svn to git. The SVN we use is very big, doesn't have a svn layout and on every version split we made a svn copy. SVN Repository structur: svnserver.company.de product xy majorversionnumber 1 majorversionnumber 2 majorversionnumber 3 minorversionnumber 3.0.0 minorversionnumber 3.0.1 minorversionnumber ... majorversionnumber 4 .... product zw What we want or what i was expecting git to do: git svn clone does clone all files from one subfolder / copy

简单快速的上手使用gitbash

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在实际的开始工作中，某些项目涉及到多人协作时，github的使用必不可少；当小白新进入一家公司时，很有可能不会开启一个全新的项目，而是跟进公司现在正在做的项目，比如，我.... 在此设定下，整理了这份gitbash使用上手教程。在公司已有的项目的前提下，简单快速的上手使用gitbash （已安装好gitbash）第一步、本地新建存放公司项目的文件夹；此时有两种途径可以使gitbash进入到项目文件夹 1.可以在该文件夹直接右键打开gitbash 2.或者直接启动GitBash程序，然后使用cd命令进入创建好的文件夹；第二步、使用git clone命令，将github上面的代码克隆到本地首先，打开公司已创建好的github项目目录，找到代码地址然后，使用git clone命令，将代码克隆到本地接下来会提示你输入账号、密码，密码输入时不显示，输错了可以删除正确输入账号密码后，gitbash进入下载状态克隆完成！第三步、进入刚开始创建的源代码存放文件夹使用cd命令，在gitbash中进入下载后的源代码文件夹wxt _webhome 第四步、修改项目内容当本地的项目文件夹内容发生更改时（此处我们新建一个test文件）：使用git status命令可以检测到当前修改，被改动的文件夹以红名形式显示：第五步、将改动添加到本地版本库修改完成后，我们使用git

Efficient cloning of cached objects

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问题 We have an application that performs comparisons on data objects to determine if one version of the object is different than another. Our application also does some extensive caching of these objects, and we've run into a bit of a performance issue when it comes to doing these comparisons. Here's the workflow: Data item 1 is the current item in memory. This item was initially retrieved from cache and deep cloned (all sub objects such as Dictionaries etc). Data item 1 is then edited, and its