generate barcode vb.net OPERATING SYSTEMS in Java

Printer Code 128 in Java OPERATING SYSTEMS

OPERATING SYSTEMS
Code 128C Reader In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
Code 128C Generator In Java
Using Barcode maker for Java Control to generate, create Code 128C image in Java applications.
Consumer: while( true ) { Order thisOrder = PC.retrieveOrder( ); distributeOrder( thisOrder ); } The complexity of guaranteeing mutual exclusion and proper coordination is hidden in the monitor s code. While a monitor may require some thought to create, it greatly simplifies the rest of the code for the cooperating processes. Java provides a simple and general-purpose monitor feature. Every object in Java has an associated monitor that is entered by a thread when the thread enters code that is synchronized on the object. If a thread attempts to enter synchronized code, and another thread already occupies the object s monitor, the thread blocks. A block of code may be explicitly labeled as synchronized with this Java syntax: synchronized( someObject ) { . . . /* Code executed within the monitor of someObject */ . . . } As a convenience, a class in Java can also declare some of its methods to be synchronized. Such a declaration is the same as synchronizing on this particular instance of the class. Thus, when one thread is executing any one of the synchronized methods of the class, no other thread will be allowed to execute any synchronized method of that instance of the class, whether the same synchronized method or a different one. Java monitors differ from the classical monitor idea in that Java monitors do not support condition variables. However, a thread can decide to wait while in the monitor, and give up the lock on the monitor while waiting, by using the synchronizing object s wait() method. Likewise, a thread waiting in the monitor can be awakened when another thread in the monitor uses the object s notify() method. Here is an example of a class that could be used to implement a producer consumer relationship between threads in Java. As long as the producer and consumer reference the same instance of the class PC, their interaction will occur correctly because the putMessage and getMessage methods are synchronized: import java.util.*; public class PC { static final int MAXQUEUE = 5; private List messages = new ArrayList(); // called by Producer public synchronized void putMessage(){ while ( messages.size() >= MAXQUEUE ) try { wait(); }catch(InterruptedException e){} messages.add(new java.util.Date().toString()); notify(); } // called by Consumer public synchronized String getMessage(){ while ( messages.size() == 0 ) try {notify(); wait(); }catch(InterruptedException e){} String message = (String)messages.remove(0); notify(); return message; } }
Code 128 Code Set C Recognizer In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
Bar Code Printer In Java
Using Barcode generation for Java Control to generate, create barcode image in Java applications.
OPERATING SYSTEMS
Barcode Decoder In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
Drawing USS Code 128 In Visual C#.NET
Using Barcode creation for .NET framework Control to generate, create ANSI/AIM Code 128 image in .NET framework applications.
[CHAP. 6
Code 128A Drawer In .NET
Using Barcode maker for ASP.NET Control to generate, create Code-128 image in ASP.NET applications.
USS Code 128 Drawer In .NET
Using Barcode creation for VS .NET Control to generate, create Code 128 Code Set B image in VS .NET applications.
Here is code called PC_demo, along with code for Producer and Consumer thread classes, that exercises the PC class as a monitor to synchronize activities: public class PC_demo { public static void main(String args[]) { PC monitor = new PC(); Producer producer = new Producer( monitor ); Consumer consumer = new Consumer( monitor ); consumer.start(); producer.start(); } } public class Producer extends Thread { PC monitor; static final int MAXQUEUE = 5; Producer( PC theMonitor ) { monitor = theMonitor; } public void run() { while ( true ) { monitor.putMessage(); try { Thread.sleep( 1000 ); }catch(InterruptedException e){} } } } public class Consumer extends Thread { PC monitor; Consumer( PC theMonitor ) { monitor = theMonitor; } public void run() { while ( true ) { String newMessage = monitor.getMessage(); System.out.println( newMessage ); } } } Since every object in Java has an associated monitor, using a monitor in Java is very convenient. The trick is to be sure that all the cooperating threads are synchronizing on the same object. A frequent error by beginners is to have multiple threads synchronizing on different objects, which of course leads to failure of synchronization. In the example above, the class PC_demo creates an instance of the monitor, and then passes that same particular instance to both the Consumer and the Producer in the constructors of the Consumer and the Producer. This insures that the Consumer and Producer are synchronizing on the same object.
Make Code 128 In Visual Basic .NET
Using Barcode generator for .NET framework Control to generate, create Code 128 Code Set C image in .NET framework applications.
Bar Code Creation In Java
Using Barcode maker for Java Control to generate, create bar code image in Java applications.
CHAP. 6]
UPC-A Supplement 5 Printer In Java
Using Barcode generator for Java Control to generate, create UPCA image in Java applications.
Barcode Creation In Java
Using Barcode creation for Java Control to generate, create barcode image in Java applications.
Encoding EAN-8 Supplement 2 Add-On In Java
Using Barcode generation for Java Control to generate, create EAN8 image in Java applications.
GS1 DataBar Limited Encoder In VS .NET
Using Barcode encoder for .NET framework Control to generate, create GS1 DataBar Expanded image in .NET framework applications.
Encode GTIN - 12 In Visual C#.NET
Using Barcode encoder for .NET Control to generate, create UPC A image in .NET applications.
Barcode Creator In VS .NET
Using Barcode drawer for ASP.NET Control to generate, create bar code image in ASP.NET applications.
Drawing Code 128 Code Set C In None
Using Barcode encoder for Microsoft Word Control to generate, create Code 128A image in Office Word applications.
Draw Data Matrix 2d Barcode In Visual C#
Using Barcode generation for VS .NET Control to generate, create ECC200 image in .NET applications.
Draw GTIN - 13 In VS .NET
Using Barcode generator for .NET Control to generate, create GS1 - 13 image in VS .NET applications.
Creating ANSI/AIM Code 39 In None
Using Barcode creator for Office Word Control to generate, create Code 39 image in Word applications.
Copyright © OnBarcode.com . All rights reserved.