c# barcode generator library free ADVANCED RUBY FEATURES in Font

Encoder Data Matrix 2d barcode in Font ADVANCED RUBY FEATURES

CHAPTER 11 ADVANCED RUBY FEATURES
Printing ECC200 In None
Using Barcode generation for Font Control to generate, create Data Matrix ECC200 image in Font applications.
www.OnBarcode.com
PDF417 Generator In None
Using Barcode drawer for Font Control to generate, create PDF-417 2d barcode image in Font applications.
www.OnBarcode.com
One of the major disadvantages of Ruby threads not being true operating system level threads is that if a thread needs to do something that calls the operating system and waits for a response, the entire Ruby threading scheduler is paused. However, for general operations Ruby s threading system is fine.
UPC - 13 Printer In None
Using Barcode creator for Font Control to generate, create GTIN - 13 image in Font applications.
www.OnBarcode.com
ANSI/AIM Code 39 Printer In None
Using Barcode creation for Font Control to generate, create ANSI/AIM Code 39 image in Font applications.
www.OnBarcode.com
Note It s likely that future versions of Ruby will implement system-level threads.
UPC-A Supplement 2 Generation In None
Using Barcode generator for Font Control to generate, create UPCA image in Font applications.
www.OnBarcode.com
Generate QR Code JIS X 0510 In None
Using Barcode drawer for Font Control to generate, create QR Code image in Font applications.
www.OnBarcode.com
Basic Ruby Threads in Action
Barcode Generation In None
Using Barcode printer for Font Control to generate, create Barcode image in Font applications.
www.OnBarcode.com
Delivery Point Barcode (DPBC) Printer In None
Using Barcode encoder for Font Control to generate, create USPS POSTal Numeric Encoding Technique Barcode image in Font applications.
www.OnBarcode.com
Here s a basic demonstration of Ruby threading in action:
Print DataMatrix In Java
Using Barcode encoder for Android Control to generate, create ECC200 image in Android applications.
www.OnBarcode.com
Generating ECC200 In .NET
Using Barcode creator for .NET Control to generate, create ECC200 image in .NET framework applications.
www.OnBarcode.com
threads = [] 10.times do thread = Thread.new do 10.times { |i| print i; $stdout.flush; sleep rand(2) } end threads << thread end threads.each { |thread| thread.join }
QR Code ISO/IEC18004 Creation In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create QR Code image in ASP.NET applications.
www.OnBarcode.com
Draw Barcode In Visual Studio .NET
Using Barcode creation for Reporting Service Control to generate, create Barcode image in Reporting Service applications.
www.OnBarcode.com
You create an array to hold your Thread objects, so that you can easily keep track of them. Then you create ten threads, sending the block of code to be executed in each thread to Thread.new, and add each generated thread to the array.
Barcode Creator In Visual Studio .NET
Using Barcode encoder for .NET Control to generate, create Barcode image in .NET framework applications.
www.OnBarcode.com
Making Barcode In Objective-C
Using Barcode generator for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
Note When you create a thread, it can access any variables that are within scope at that point. However,
Barcode Creation In Objective-C
Using Barcode generator for iPhone Control to generate, create Barcode image in iPhone applications.
www.OnBarcode.com
Code 128 Code Set C Decoder In .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
any local variables that are then created within the thread are entirely local to that thread. This is similar to the behavior of other types of code blocks.
Barcode Encoder In None
Using Barcode generator for Excel Control to generate, create Barcode image in Office Excel applications.
www.OnBarcode.com
Barcode Creation In VB.NET
Using Barcode creation for Visual Studio .NET Control to generate, create Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
Once you ve created the threads, you wait for all of them to complete before the program finishes. You wait by looping through all the thread objects in threads and calling each thread s join method. The join method makes the main program wait until a thread s execution is complete before continuing. In this way you make sure all the threads are complete before exiting.
UPC - 13 Creation In Visual Basic .NET
Using Barcode maker for Visual Studio .NET Control to generate, create EAN / UCC - 13 image in Visual Studio .NET applications.
www.OnBarcode.com
Printing Code 39 In C#
Using Barcode creator for .NET framework Control to generate, create ANSI/AIM Code 39 image in .NET framework applications.
www.OnBarcode.com
CHAPTER 11 ADVANCED RUBY FEATURES
The preceding program results in output similar to the following (the variation is due to the randomness of the sleeping):
00101200010010101212312124232512323453234336634544365546744548776557886689756765 67979789878889899999
The example has created ten Ruby threads whose sole job is to count and sleep randomly. This results in the preceding pseudo-random output. Rather than sleeping, the threads could have been fetching Web pages, performing math operations, or sending e-mails. In fact, Ruby threads are ideal for almost every situation where concurrency within a single Ruby program is desired.
Note In 15 you ll be using threads to create a server that creates new threads of execution for
each client that connects to it, so that you can develop a simple chat system.
Advanced Thread Operations
As you ve seen, creating and running basic threads is fairly simple, but threads also offer a number of advanced features. These are discussed in the following subsections.
Waiting for Threads to Finish Redux
When you waited for your threads to finish by using the join method, you could have specified a timeout value (in seconds) for which to wait. If the thread doesn t finish within that time, join returns nil. Here s an example where each thread is given only one second to execute:
threads.each do |thread| puts "Thread #{thread.object_id} didn't finish within 1s" unless thread.join(1) end
Getting a List of All Threads
It s possible to get a global list of all threads running within your program using Thread.list. In fact, if you didn t want to keep your own store of threads, you could
CHAPTER 11 ADVANCED RUBY FEATURES
rewrite the earlier example from the section Basic Ruby Threads in Action down to these two lines:
10.times { Thread.new { 10.times { |i| print i; $stdout.flush; sleep rand(2) } } } Thread.list.each { |thread| thread.join }
However, keeping your own list of threads is essential if you re likely to have more than one group of threads working within an application, and you want to keep them separate from one another when it comes to using join or other features. The list of threads also includes the main thread representing the main program s thread of execution. You can check to see which thread is main by comparing the thread object to Thread.main, like so:
Thread.list.each { |thread| thread.join unless thread == Thread.main }
Thread Operations from Within Threads Themselves
Threads aren t just tiny, dumb fragments of code. They have the ability to talk with the Ruby thread scheduler and provide updates on their status. For example, a thread can stop itself:
Copyright © OnBarcode.com . All rights reserved.