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Tutorial on Threads Programming with PythonThreads play a major role in applications programming today. For example, most Web servers are threaded, as are many Java GUI programs. Here are the major settings in which using threads has been founded convenient and/or efficient:
• Programs with asynchronous events:
Here the program must be ready for various events, but does not know the order in which they might occur. For example, in Sections 3.1 and 3.2, we have a network server connected to several clients. The server does not know from which client the next message will arrive. So, we have the server create a separate thread for each client, with each thread handling only its client.
• Programs whose peformance can be improved through latency hiding:
Here the program is doing multiple I/O operations, each having long latency, i.e. delay in response. We’d like to perform useful work while waiting for the response, so we have different threads for each I/O action. This way, although the latency is still there, it is “hidden” by doing other useful work in parallel.
For example, in Section 4.2, each thread performs a separate network operation.
• Computation-intensive programs:
If our program is a long-running mathematical computation, it can really benefit from having several processors, e.g. two processors in the case of dual-core machines. By having our program set up a different thread for each processor, we have the potential for substantial speedup, due to the parallelization of the computation. An example is in Section 5.
What Are Threads?
Processes
If your knowledge of operating systems is rather sketchy, youHow to setup and secure Snort, MySQL and Acid on FreeBSD 4.7 ReleaseThis document will help a user install FreeBSD 4.7 Release, Snort 1.9.0, MySQL 3.23.53, and ACID-0.9.6b21. It will also guide the user through the process of securing the machine and getting the snort sensor(s) to log to a central database over stunnel. The intention is to give users that are new to any of the software the opportunity to build an enterprise-class system based completely on free, open-source tools. Following the instructions in this document will get you the following:
• Multiple FreeBSD boxes, one running the Windowmaker desktop. I chose Windowmaker because the intention of this tutorial is to create dedicated Snort machines. In other words Gnome and KDE are overkill for what we are doing here (and it looks nice).
• Locked-down machines (C2 in 2002!). I tried to be responsible with the securing of these boxes, but this is not a definitive guide to securing FreeBSD; there are several links to those at the end. If I have missed something obvious, feel free to point it out (nicely please) with your suggestion on exactly how to fix it.
• Multiple Snort sensors logging to a central MySql server/viewing station.
• An easy method of updating your software via the ports collection.
• The fastest NIDS for your money.
Download pdf How to setup and secure Snort, MySQL and Acid on FreeBSD 4.7 ReleaseWebCenter Substitute Guide 1.1.0WebCenter expands SEMS (Substitute Employee Management System) capabilities to include Internet/Intranet access. WebCenter is configured to work with SEMS and cannot be configured without SEMS.
WebCenter is accessible from Macintosh or PC compatible computers and uses an Internet browser such as Netscape or Internet Explorer. The WebCenter site operates in a secured environment for Internet access using a security certificate for encryption. Access to WebCenter requires the use of an Identification Number and Personal Identification Number to gain access to the system.
You can modify your profile, which includes callback number, period of unavailability, daily availability (if allowed) and set your “Do not Disturb” time. You can review and print past, current and future assignments. Assignments can be canceled.
You can search for available jobs. The list of jobs may change at any time, as the job list is dependant on the current callout step of the call processor (IVR). This method of offering substitutes assignments maintains the integrity of the order in which substitutes are offered assignments. You can be notified of your expiration dates.
Download pdf WebCenter Substitute Guide 1.1.0Web 2.0 applications as alternative environments for informal learning - a critical reviewWhilst a number of methodological and philosophical difficulties surround its definition, ‘informal learning’ is now acknowledged to be a vital element of education for learners of all ages (Colley et al. 2003). Despite the ‘slippery’ nature of the concept (Girod 1990), there is an emerging consensus that the nature of informal learning is more specific than simply being any learning outside of formal education. At one level informal learning is “undertake[n] individually or collectively, on our own without externally imposed criteria or the presence of an institutionally authorised instructor” (Livingstone 2000, p.493). Thus, whereas formal learning is typically institutionally sponsored, classroom based and structured, informal learning “is not typically classroom based or highly structured, and control of learning rests primarily in the hands of the learner” (Marsick & Watkins 1990, p.12). Yet we should not overlook the fact that informal learning also includes a range of learning stimulated by general interests which is ‘caught not taught’ (Davies 1998).
There is growing evidence that many people are engaged in a wide range of technology-based informal learning at home and the community (Cranmer 2006, Impact2 2003, Facer et al. 2003). As Sefton-Green (2005, p.3) concluded from an extensive review of literature in the area: “computers and other aspects of Information and Communication Technologies (ICTs) allow children and young people a wide variety of activities and experiences that can support learning, yet many of these transactions do not take place in traditional educational settings. In fact many of these may not be considered ‘educational’Toshiba Qosmio G30 User’s ManualThis powerful notebook computer provides excellent expansion capability, including multimedia devices, and it is designed to provide years of reliable, high-performance computing. Your computer is equipped with a built-in TV tuner. When you wish to display a TV program or play a CD/DVD before Windows starts, press the TV button or the CD/DVD button (or the same buttons on the remote control) respectively. When Windows is running, you can display or record a TV program using the My TV feature of Media Center. This manual tells how to set up and begin using your Qosmio G30 computer. It also provides detailed information on configuring your computer, basic operations and care, using optional devices and troubleshooting.
If you are a new user of computers or if you’re new to portable computing, first read over the Introduction and The Grand Tour chapters to familiarize yourself with the computer’s features, components and accessory devices. Then read Getting Started for step-by-step instructions on setting up your computer. If you are an experienced computer user, please continue reading the preface to learn how this manual is organized, then become acquainted with this manual by browsing through its pages. Be sure to look over the Special features section of the Introduction, to learn about features that are uncommon or unique to the computers and carefully read HW Setup. If you are going to install PC cards or connect external devices such as a monitor, be sure to read Chapter 9, Optional Devices.
Download Toshiba Qosmio G30 User’s ManualEJB's 101 DamnationsThis is the tale of 101 Damnations. Sadly, it's no Disney story - in fact it's more likely to have been pulled from the pages of the Brothers Grimm. Whilst writing the EJB modules for our JGenerator product, we started punting an email back and forth containing all the issues we had with EJB. And there were many. Before we knew it we ended up with 101 howlers. In this article we present an edited version of the email. It isn't a complete list and there may be some overlapping issues. If there is enough interest we will turn it into a more formal analysis.
Before you flame us for chasing after your sacred cow with a big stick, all three of us have belonged to the "pro-Java" lobby since Java was in its first beta, and we still do. We have evangelised Java at every company we have worked at. However, EJB just presents so much that is wrong and messed up that we felt we had to speak out.
The 101 issues are divided into the following categories:
• Conceptual
• Design
• Development
• Deployment
• Runtime
• Knock-On Effects
And finally there's a conclusion, containing some heartfelt suggestions for improving the EJB spec. We want Java and J2EE to succeed. We want it to remain the platform for developing server-side applications. We just hope that somebody at Sun is paying attention…
Download pdf EJB's 101 DamnationsTeach Yourself JAVA in 21 DaysJava is an object-oriented programming language developed by Sun Microsystems, a company best known for its high-end Unix workstations. Modeled after C++, the Java language was designed to be small, simple, and portable across platforms and operating systems, both at the source and at the binary level (more about this later). Java is often mentioned in the same breath as HotJava, a World Wide Web browser from Sun like Netscape or Mosaic (see Figure 1.1). What makes HotJava different from most other browsers is that, in addition to all its basic Web features, it can also download and play applets on the reader’s system.
Applets appear in a Web page much in the same way as images do, but unlike images, applets are dynamic and interactive. Applets can be used to create animations, figures, or areas that can respond to input from the reader, games, or other interactive effects on the same Web pages among the text and graphics. Although HotJava was the first World Wide Web browser to be able to play Java applets, Java support is rapidly becoming available in other browsers. Netscape 2.0 provides support for Java applets, and other browser developers have also announced support for Java in forthcoming products.
Source: www.cs.usfca.edu
Download Teach Yourself JAVA in 21 DaysRear Camera System Owners ManualRear Camera System Owner’s Manual RL2 . 2005 American Honda Motor Co., Inc. - All Rights Reserved.
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Download PDFCisco - Cisco Secure PIX Firewall Command ReferencesNote: Refer to the Cisco PIX Firewall Software Command References page for the latest Cisco PIX Firewall. Command References. Introduction
Cisco Secure PIX Firewall Command References Document ID: 5119 Introduction Prerequisites Requirements Components Used Conventio PIX Command References NetPro Discussion Forums ? Featured Conveatio Related Information Note: Refer to the Cisco PIX Firewall Software Command References page for the latest Cisco PIX Firewall Command References. Introduction This document provides direct links to the PIX Firewall Software Command References. Prerequisites Requirements There are no specific prerequisites for this document. Components Used The information in this document is based on the software and hardware veio below. PIX Firewall Software veio 2.7.n through 7.x • Conventio Refer to Cisco Technical Tips Conventio for more information on document conventio. PIX Command References Commands PIX 7.2 Command Reference PIX 7.1 Command Reference PIX 7.0 Command Reference PIX 6.3 Command Reference PIX 6.2 Command Reference PIX 6.1 Command Reference Cisco ? Cisco Secure PIX Firewall Command References PIX 6.0 Command Reference PIX 5.3 Command Reference PIX 5.2 Command Reference PIX 5.1 Command Reference PIX 5.0 Command Reference PIX 4.4 Command Reference PIX 4.3 Command Reference PIX 4.2 Command Reference PIX 4.0 Command Reference PIX 3.0 Command Reference PIX 2.7.n Command Reference NetPro Discussion Forums ? Featured Conveatio Networking Professionals
Get PDFMaster View 2 Port KVM Switch CS-12 Users Manual pdfConsole PC Cables 2 port KVM SWITCH Overview The Master View CS-12 KVM (Keyboard, Video, Mouse), Switch is a control unit that allows access to two computers from a single console (keyboard, mouse, and monitor). Before the development of the Master View, the only way to control multiple computer configurations from a single console was through a complex and costly network system. Now, with the Master View CS-12, you can easily access two computers in a cost effective manner. Setup is fast and easy; plugging cables into their appropriate ports is all that is entailed.
There is no software to configure, so there is no need to get involved in complex software installation routines or be concerned with incompatibility problems. Since the Master View CS-12 intercepts keyboard input directly, it works on any hardware platform and with all operating systems. The Master View CS-12 provides two convenient methods to access the computers connected to the system: using the push button Selection switch located on the unit’s side panel; and entering Hot Key combinations from the keyboard. There is no better way to save time and money than with a Master View CS-12 installation. By allowing a single console to manage both of the attached PCs, the Master View CS-12 eliminates the expense of purchasing a separate keyboard, monitor, and mouse for each PC. Additionally, it saves all the extra space they would take up, and eliminates the inconvenience and wasted effort involved in constantly having to move from one PC to
