visual basic barcode printing The preceding code waits until notify() is called on anotherObject. in Java

Generator PDF417 in Java The preceding code waits until notify() is called on anotherObject.

The preceding code waits until notify() is called on anotherObject.
Scanning PDF417 In Java
Using Barcode Control SDK for Java Control to generate, create, read, scan barcode image in Java applications.
Encode PDF 417 In Java
Using Barcode encoder for Java Control to generate, create PDF 417 image in Java applications.
synchronized(this) { notify(); }
PDF417 Recognizer In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
Painting Bar Code In Java
Using Barcode generator for Java Control to generate, create bar code image in Java applications.
This code notifies any thread currently waiting on the this object. The lock can be acquired much earlier in the code, such as in the calling method. Note that if the thread calling wait() does not own the lock, it will throw an IllegalMonitorStateException. This exception is not a checked exception, so you don t have to catch it explicitly. You should always be clear whether a thread has the lock of an object in any given block of code. Notice in lines 7 10 there is a try/catch block around the wait() method. A waiting thread can be interrupted in the same way as a sleeping thread, so you have to take care of the exception:
Reading Bar Code In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
Generate PDF 417 In C#
Using Barcode generation for Visual Studio .NET Control to generate, create PDF417 image in Visual Studio .NET applications.
try{ wait(); } catch(InterruptedException e) { // Do something about it }
PDF 417 Maker In .NET
Using Barcode printer for ASP.NET Control to generate, create PDF-417 2d barcode image in ASP.NET applications.
Create PDF-417 2d Barcode In Visual Studio .NET
Using Barcode printer for .NET framework Control to generate, create PDF 417 image in .NET applications.
In the fabric example, the way to use these methods is to have the hardware thread wait on the shape to be available and the user thread to notify after it has written the steps.
PDF 417 Creation In Visual Basic .NET
Using Barcode creation for VS .NET Control to generate, create PDF417 image in .NET applications.
Generating ANSI/AIM Code 128 In Java
Using Barcode creator for Java Control to generate, create Code128 image in Java applications.
Thread Interaction (Exam Objective 7.4)
Data Matrix ECC200 Generation In Java
Using Barcode encoder for Java Control to generate, create Data Matrix image in Java applications.
DataBar Creator In Java
Using Barcode encoder for Java Control to generate, create GS1 DataBar Expanded image in Java applications.
The machine steps may comprise global steps, such as moving the required fabric to the cutting area, and a number of substeps, such as the direction and length of a cut. As an example they could be
2/5 Standard Maker In Java
Using Barcode generation for Java Control to generate, create 2 of 5 Industrial image in Java applications.
GS1 128 Maker In Visual C#.NET
Using Barcode generator for .NET Control to generate, create UCC-128 image in .NET framework applications.
int fabricRoll; int cuttingSpeed; Point startingPoint; float[] directions; float[] lengths; etc..
Make Code-39 In Java
Using Barcode generation for Android Control to generate, create Code 39 Extended image in Android applications.
Barcode Reader In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
It is important that the user thread does not modify the machine steps while the hardware thread is using them, so this reading and writing should be synchronized. The resulting code would look like this:
Generating UCC - 12 In Objective-C
Using Barcode generation for iPad Control to generate, create EAN128 image in iPad applications.
ECC200 Encoder In None
Using Barcode printer for Office Word Control to generate, create ECC200 image in Office Word applications.
class Operator extends Thread { public void run(){ while(true){ // Get shape from user synchronized(this){ // Calculate new machine steps from shape notify(); } } } } class Machine extends Thread { Operator operator; // assume this gets initialized public void run(){ while(true){ synchronized(operator){ try { operator.wait(); } catch(InterruptedException ie) {} // Send machine steps to hardware } } } }
UPC-A Supplement 5 Decoder In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
USS Code 39 Recognizer In Visual C#.NET
Using Barcode reader for .NET Control to read, scan read, scan image in VS .NET applications.
The machine thread, once started, will immediately go into the waiting state and will wait patiently until the operator sends the first notification. At that point it is the operator thread that owns the lock for the object, so the hardware thread gets stuck
9: Threads
for a while. It s only after the operator thread abandons the synchronized block that the hardware thread can really start processing the machine steps. While one shape is being processed by the hardware, the user may interact with the system and specify another shape to be cut. When the user is finished with the shape and it is time to cut it, the operator thread attempts to enter the synchronized block, maybe blocking until the machine thread has finished with the previous machine steps. When the machine thread has finished, it repeats the loop, going again to the waiting state (and therefore releasing the lock). Only then can the operator thread enter the synchronized block and overwrite the machine steps with the new ones. Having two threads is definitely an improvement over having one, although in this implementation there is still a possibility of making the user wait. A further improvement would be to have many shapes in a queue, thereby reducing the possibility of requiring the user to wait for the hardware. There is also a second form of wait() that accepts a number of milliseconds as a maximum time to wait. If the thread is not interrupted, it will continue normally whenever it is notified or the specified timeout has elapsed. This normal continuation consists of getting out of the waiting state, but to continue execution it will have to get the lock for the object:
synchronized(a){ // The thread gets the lock on a a.wait(2000); // The thread releases the lock and waits for notify // But only for a maximum of two seconds, then goes back to Runnable // The thread reacquires the lock // More instructions here }
When the wait() method is invoked on an object, the thread executing that code gives up its lock on the object immediately. However, when notify() is called, that doesn t mean the thread gives up its lock at that moment. If the thread is still completing synchronized code, the lock is not released until the thread moves out of synchronized code. So just because notify() is called doesn t mean the lock becomes available at that moment.
Copyright © OnBarcode.com . All rights reserved.