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Pthreads Programming: A POSIX Standard for Better Multiprocessing (O'Reilly Nutshell)
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Computers are just as busy as the rest of us nowadays. They have lots of tasks to do at once, and need some cleverness to get them all done at the same time. That's why threads are seen more and more often as a new model for programming. Threads have been available for some time. The Mach operating system, the Distributed Computer Environment (DCE), and Windows NT all feature threads. One advantage of most UNIX implementations, as well as DCE, is that they conform to a recently ratified POSIX standard (originally 1003.4a, now 1003.1c), which allows your programs to be portable between them. POSIX threads are commonly known as pthreads, after the word that starts all the names of the function calls. The standard is supported by Solaris, OSF/1, AIX, and several other UNIX-based operating systems. The idea behind threads programming is to have multiple tasks running concurrently within the same program. They can share a single CPU as processes do, or take advantage of multiple CPUs when available. In either case, they provide a clean way to divide the tasks of a program while sharing data. A window interface can read input on dozens of different buttons, each responsible for a separate task. A network server has to accept simultaneous calls from many clients, providing each with reasonable response time. A multiprocessor runs a number-crunching program on several CPUs at once, combining the results when all are done. All these kinds of applications can benefit from threads. In this book you will learn not only what the pthread calls are, but when it is a good idea to use threads and how to make them efficient (which is the whole reason for using threads in the first place). The authors delves into performance issues, comparing threads to processes, contrasting kernel threads to user threads, and showing how to measure speed. He also describes in a simple, clear manner what all the advanced features are for, and how threads interact with the rest of the UNIX system. Topics include: - Basic design techniques
- Mutexes, conditions, and specialized synchronization techniques
- Scheduling, priorities, and other real-time issues
- Cancellation
- UNIX libraries and re-entrant routines
- Signals
- Debugging tips
- Measuring performance
- Special considerations for the Distributed Computing Environment (DCE)
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Foundation Actionscript 3.0 Animation: Making Things Move!
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Flash has long been one of the most approachable, user-friendly tools for creating web-based animations, games, and applications. This has contributed to making it one of the most widely used programs for creating interactive web content. With each new version of Flash, ActionScript, its built-in scripting language, has become more powerful and a little more complex, too. ActionScript, now at version 3.0, has significantly matured as a programming language, bringing power and speed only previously dreamed about to Flash-based animation, going far beyond traditionally used keyframes and tweens. The material inside this book covers everything you need to know to harness the power of ActionScript 3.0. First, all the basics of script-based animation and setting up an ActionScript 3.0 project are covered. An introduction to object-oriented programming follows, with the new syntax, events, and rendering techniques of ActionScript 3.0 explained, giving you the confidence to use the language, whether starting from scratch or moving up from ActionScript 2.0. The book goes on to provide information on all the relevant trigonometry you will need, before moving on to physics concepts such as acceleration, velocity, easing, springs, collision detection, conservation of momentum, 3D, and forward and inverse kinematics. In no time at all, you'll both understand the concepts of scripted animation and have the ability to create all manner of exciting animations and games.
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Automating System Administration with Perl: Tools to Make You More Efficient
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If you do systems administration work of any kind, you have to deal with the growing complexity of your environment and increasing demands on your time. Automating System Administration with Perl, Second Edition, not only offers you the right tools for your job, but also suggests the best way to approach specific problems and to securely automate recurring tasks. Updated and expanded to cover the latest operating systems, technologies, and Perl modules, this edition of the "Otter Book" will help you: - Manage user accounts
- Monitor filesystems and processes
- Work with configuration files in important formats such as XML and YAML
- Administer databases, including MySQL, MS-SQL, and Oracle with DBI
- Work with directory services like LDAP and Active Directory
- Script email protocols and spam control
- Effectively create, handle, and analyze log files Administer network name and configuration services, including NIS, DNS and DHCP
- Maintain, monitor, and map network services, using technologies and tools such as SNMP, nmap, libpcap, GraphViz and RRDtool
- Improve filesystem, process, and network security
This edition includes additional appendixes to get you up to speed on technologies such as XML/XPath, LDAP, SNMP, and SQL. With this book in hand and Perl in your toolbox, you can do more with less--fewer resources, less effort, and far less hassle. Customer Review :
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VBScript Programmer's Reference
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- Completely updated for Windows Vista and Windows Server 2003 R2, this book is packed with practical examples for today's programmer, Web developer, or system administrator
- Combines a comprehensive overview of the VBScript technology and associated technologies with sample code at every stage from beginner to advanced user
- Discusses the general syntax, functions, keywords, style, error handling, and similar language-specific topics and then moves into an expanded reference section covering the object models in detail
- Presents advanced coverage on Active Directory Service Interfaces (ADSI), PowerShell, security scripting, remote scripting, database scripting, and more
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PHP 6 and MySQL 5 for Dynamic Web Sites: Visual QuickPro Guide
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It hasn't taken Web developers long to discover that when it comes to creating dynamic, database-driven Web sites, MySQL and PHP provide a winning open source combination. Add this book to the mix, and there's no limit to the powerful, interactive Web sites that developers can create. With step-by-step instructions, complete scripts, and expert tips to guide readers, veteran author and database designer Larry Ullman gets right down to business: After grounding readers with separate discussions of first the scripting language (PHP) and then the database program (MySQL), he goes on to cover security, sessions and cookies, and using additional Web tools, with several sections devoted to creating sample applications. This guide is indispensable for intermediate- to advanced level Web designers who want to replace their static sites with something dynamic. In this edition, the bulk of the new material covers the latest versions of both technologies: PHP 6 (due out in 2008) and MySQL 5 (available now). The book's publication date is likely to beat the official release of PHP 6, making it one of the first books available on the subject.
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Questions & Answers
Question : What is the general difference in sea level for high and low tides?
I assume (based on general ignorance and forgetfulness) that high and low tides are generally steady in their respective levels and that their absolute levels are cyclical, based on lunar position.What is the average difference in average high and low tides and what is the absolute difference in the lowest low and the highest high tide?What is the general speed of tidal change and what is the general flow rate of tides on, either (or both) pacific or atlantic oceans?Thanks!
Answer:
It depends on the latitude and the morphology of the local sea floor and shoreline. In the Arctic Ocean the tidal range is less than 0.8 meters in some areas. Here is a map of tidal range for the Arctic Ocean:http://fvcom.smast.umassd.edu/research_projects/ArcticGlobalM/images/arctic_bathy_image.jpgThe highest tide on earth is near Wolfville in Nova Scotia (Bay of Fundy). The difference between high and low tide levels is as much as 16 meters (52.5 feet).http://museum.gov.ns.ca/fossils/protect/tides.htmKeep in mind that the moon is not the only force that creates the tides. The sun also plays a role, so when the sun and moon have gravitational pull in the same alignment, there will be higher and lower tides. Tides are very predictable based on the cycles created by the rotation of the moon around the earth and the earth's rotational position relative to the sun. It is very difficult to answer your question about average differences, since this cannot be easily quantified in order to average it. Tidal height charts and reporting for much of the world:http://tbone.biol.sc.edu/tide/Tidal cycles are of three types: semidiurnal (two high, two low per day), diurnal (one high and one low per day) and mixed tides with a higher high tide, a medium high tide, and a lowest and higher low tide each day. Examples are: Semidiurnal tides are found along the east coast of Florida; Diurnal tides are found along the Gulf Coast of Florida west of Apalachicola; Mixed tides are found from the Florida Keys to Apalachicola. The absolute lowest tides by National Ocean Service definition, are 0.1 feet, since anything with less than this is not defined as a tide. Tides must be at least two hours apart to be considered as a tide by this same definition. See: http://data.labins.org/2003/SurveyData/WaterBoundary/MHW/documents/2typeoftide.pdfTidal cycles repeat over a 24 hour 50 minute period, with a full cycle variation of 18.6 years based on the declination of the moon. As for speed: (I quote) "An idealized tidal wave would move across Earth at 1,600 kilometers per hour (1,000 miles per hour) at the equator. Because tides are an extreme example of a shallow-water wave, friction with the ocean floor slows tides to a speed of about 700 kilometers per hour (435 miles per hour)." from http://www.waterencyclopedia.com/St-Ts/Tides.html
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Question : What general courses are required to graduate college?
I am planning to take College Now courses in NYC and to those who don't know; these programs give college credit for the course taken. I want to take these courses so that I don't need to take them in college. Can anyone tell me what are the general courses required to graduate a 4 year college? Or courses that are required for pre-med?
Answer:
DO NOT take pre-med courses with College Now, online, or at a community colleges. Medical schools will eat you alive for it. In order to find out what you need to graduate from college, first pick a college and a major. Then, look at the major's required clasess as well as that university's required classes. Next, make sure that College Now credit is accepted. Then, pick some low level courses to take.
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Question : Whats the difference between the General and the discipline specific part of the FE exam.?
I am going to take the FE exam in the fall. What is the difference between taking the General portion in the afternoon vs the DS.I am asking as to evaluate if it will effect the quality of me taking this test. Will employers look to see if you took the general vs the DS portion or will they just look to see that you passed this test?
Answer:
A General has anywhere from one to four stars on his shoulder boards. The discipline specific part must be that they are expecting you to be specific about your discipline before you administer it.
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Question : What general defeated the Mexicans in Mexico City?
What general defeated the Mexicans in Mexico City?What was the name of the Treaty that ended the Mexican War?What did this traty say regarding Texas?
Answer:
General Winfield ScottTreaty of Guadalupe HidalgoIt gave the U.S. undisputed control of Texas and established the U.S.-Mexican border of the Rio Grande River.
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Question : What is the general shape of a variation function?
When you are using regressions, you need to know the general shape of the function. What is the general shape and how can you tell the difference between a variation function and an exponential function?
Answer:
A direct variation function has a straight line for its graph, passing through the origin. An inverse variation has a hyperbola for its graph. Exponential function graphs assuming no translations pass through (0,1) since anything to the 0 power is 1. They either start low and curve higher or start high and curve lower
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Question : I am interested in becoming a general surgeon. What type of high school classes should I take?
Also, what type of things should I do as a teenager to become better qualified to be a general surgeon when I am grown up? What type of jobs can a 16 year old get that would help me become a general surgeon later on? What are the steps to becoming a successful general surgeon?
Answer:
VOLUNTEER at a hospital, or try EMT, i know you can do some EMT stuff at 16 and take ap and IB classes that looks better and if you score high enough on the exams (5) you wont have to take bio or chem in college and will be more prepared and have more time for other important classes and youll be able to focus on your major
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Question : In general, would the admissions officers and George Washington University itself support gay rights?
I want to write about gay rights for an admissions essay, but i am unsure about the university's view on gay rights. Does anyone know whether the university in general AND the admissions officers support or oppose gay rights?
Answer:
There is no reliable way for anyone to tell you whether this topic would help or hurt you.Technically, it would be illegal for the University to downgrade your application by bias against the political content.That said, there typically never would be a way to prove that a negative appraisal was due to bias.So, it's up to you to decide.You might just go ahead on the concept that if any University turned you down due to bias against the content of your speech wouldn't you be better off getting your higher education elsewhere?Good Luck!
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Question : Whats the difference between general desktop graphics and 3D gaming graphics?
Whats the difference between general desktop graphics and 3D gaming graphics?On my new PC, the sub score for the vista aero glass interface isnt to good but the 3D graphics rating is ok, so im just wondering what is the difference, and if possible how to improve the general desktop graphics.
Answer:
General desktop graphics are no for intensice stuff, it is only for video, work documents, and taht sort of thing but Gaming graphics are for Rendering intensive 3d Models, Photo editing, video editing, and animation creation. These are the things the 3d Gamign grpahics would be used for to improve your graphics rating u would have to buy a new graphics card
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Question : If I finish General education in one college, Can i start on my AA degree at another?
I am going to being finishing my General Education at the college Iam going to. I want to get my Associates Degree in Drafting Technology but at another college. Do you think I will be able to? For example, will my general education classes transfer to the to the other college?
Answer:
The classes will transfer if (a) the college you're attending is regionally accredited by an accrediting agency recognized by the US Dept of Education, (b) you got a C or better in the class, and (c) the college you're transferring them to offers the same classes.
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Question : What general objection can you use in a divorce case set for the day of trial?
What general objection can you use in responses to request for production of documents for a divorce case set for the day of trial? Where can you find a list of such objections? If there are about 800-1000 pages of papers involved such as banking statements, brokerage house statements for many years, should you make all the copys for the court and for the other party, or just bring the original documents to the court at the date of the trial?
Answer:
oh my goodness - you need to speak to an attorney... there is no general objection you can make... it's evidence and if it exists you have to get it. you generally bring 3 copies - one for the court, one for you, and one for the other party.
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