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kinds. The mutex consists of 4 operations, namely, create, destroy, lock and unlock. There are 5 actions for conditional operations: Create, Destroy, Trigger, broadcast, and wait. Other thread extension concepts, such as semaphores, can be encapsulated by the basic operation of the three basic elements above.Back to top of page5 experiences in Linux threading try setting the Recursive property to initialize the Linux mutexMutexes are the basic concepts in multithreaded programming and are widel

when a non-numeric value is found. Protect file systemsIn July 2000, a Web site leaked customer data stored in Web server files. A visitor of the Web site uses a URL to view files containing data. Although the file is misplaced, this example highlights the importance of protecting the file system for attackers. If the PHP application processes the file at will and contains variable data that can be entered by the user, check the user input carefully to ensure that the user cannot perform any

relational database. If the authentication information provided by the user is valid, the login action injects an object into the HttpSession object. If an injection object exists in HttpSession, it indicates that the user has logged on. For ease of understanding, only one user name is written into HttpSession to indicate that the user has logged on. Listing 1 illustrates the login action by extracting a piece of code from the loginAction. jsp page:

mechanism.The custom security authentication mechanism is generally used to obtain authentication information from the form, and then authenticate to the security domain such as LDAP (lightweight directory access protocol) or relational database. If the authentication information provided by the user is valid, the login action injects an object into the HttpSession object. If an injection object exists in HttpSession, it indicates that the user has logged on. For ease of understanding, only one

of these technologies to truly mastering these technologies (and really opening the door to WEB application development).XMLHttpRequest ObjectOne of the objects to understand may be the most unfamiliar to you, namely XMLHttpRequest. This is a JavaScript object and it is simple to create the object, as shown in Listing 1.Listing 1. Create a new XMLHttpRequest objectThis object will be discussed further in t

After learning about the basic display and style of XML in the Firefox browser, the next function to be followed is script. In this article, I will show how to use JavaScriptCodeProcess the basic concept of XML. All the code examples and screens in this article are created and tested using Firefox 1.5.0.4 in Ubuntu Linux. The configuration file has not been modified (that is, there is no extension, and the default options for installation are retained ). If you want to write cross-browser code f

here.Hard LinksUse the ln command to create an extra hard link to an existing file (but not a directory, even if the system sets. and.. As to a hard link).Listing 1 shows how to create a directory containing two files and a subdirectory that contains two hard links for File1, one in the same directory, and the other in a subdirectory. We add a word to file1 and then add another word to file3 and display the contents of the link in the subdirectory to

, dumps () and dump () use printable ASCII representations to create pickle. Both have a final argument (optional), and if true, the parameter specifies a faster and smaller binary representation to create the pickle. The loads () and load () functions automatically detect whether the pickle is binary or text-formatted. Listing 1 shows an interactive session that uses the dumps () and loads () functions described just now: demo of

loads to make your interactions smoother. In order to demonstrate it, I will use a simple, dynamically updated item to add to the shopping cart. Combined with an online store, this method allows us to continue browsing and picking items into our shopping cart without waiting for the page overload to be clicked. 　　 Although the code in this article is for shopping cart examples, the techniques shown here can be used in other AJAX applications. The HTML code used by the shopping cart sample is

-space programs.Back to top of pageVersion checking of the moduleThe rapid development of Linux has resulted in a large difference between the neighboring versions of the kernel, namely, the version patch number (patch level, the fourth digit of the kernel version number) that is adjacent to the kernel. To ensure the stability of the kernel, Linux has adopted a version-checking mechanism for the modules when loading the module into the kernel. The load module shown in

Like Perl and Python, Ruby has excellent functionality and is a powerful text-processing language. This article gives a brief introduction to Ruby's text-processing capabilities and how to use Ruby to effectively process text data in different formats, whether it is CSV or XML data. Ruby string Common Abbreviations CSV: comma-separated values Rexml:ruby Electric XML XML: Extensible Markup Language A String in Ruby is a powerful way to accommodate, comp

. the router calls the method on the controller with the same parameters as the action. 5. The action parameter sets instance variables for the view and displays the view. 6. The action method copies the instance variables to the view. For example, see the show method in Listing 2. The @ person instance variable used by the Controller to set the view. Because the method does not specify the view name, rails calls the view with the same name as the

relational database. If the authentication information provided by the user is valid, the login action injects an object into the httpsession object. If an injection object exists in httpsession, it indicates that the user has logged on. For ease of understanding, only one user name is written into httpsession to indicate that the user has logged on. Listing 1 illustrates the login action by extracting a piece of code from the loginaction. jsp page:

successfully tested on the latest Microsoft Internet Explorer (IE), Netscape Navigator, Mozilla, Firefox, and avantbrowsers. Login action Brian pontarelli's classic article J2EE Security: Container versus M discusses different J2EE authentication methods. The article also pointed out that the HTTP protocol and form-based authentication do not provide a mechanism to process user exit. Therefore, the solution is to introduce a custom security implementation mechanism. The custom security authenti

The thread pool chapter in the ace programmer guide mentions two modes: Semi-synchronous semi-asynchronous mode and leader and followers mode. A sample program is provided in the book. For convenience, I paste the sample code here: # Include "ACE/config-lite.h"# If defined (ace_has_threads) # Include "ACE/OS _ns_string.h"# Include "ACE/OS _ns_sys_time.h"# Include "ACE/task. H"# Include "ACE/containers. H"# Include "ACE/synch. H" // Listing 4 Code/c

designer. They want to use the object relationship designer to generate object classes, but they do not want the generated object classes to be decorated by a bunch of features. I 've talked to several people recently who are deeply bothered by the fact that the LINQ to SQL classes generated by the Visual Studio Object Relational designer contain attributes. they want to take advantage of the Object Relational designer to generate their entity classes. however, they don't like the fact that th

example, a clear hierarchy allows you to modify the user interface without modifying the data access code. If you need to use ASP. NET Framework to generate multi-layer Web applications, you can use another new control introduced by ASP. NET 2.0 Framework:ObjectdatasourceWidgetObjectdatasourceControls allow youGridviewAndDropdownlistThis user interface control is bound to an intermediate layer component. This articleArticleIsObjectdatasourceControl. In this article, you will learn how to us