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The javautilconcurrentlocks package provides support for locks, which are objects that offer an alternative to using synchronized to control access to a shared resource In general, here is how a lock works Before accessing a shared resource, the lock that protects that resource is acquired When access to the resource is complete, the lock is released If a second thread attempts to acquire the lock when it is in use by another thread, the second thread will suspend until the lock is released In this way, conflicting access to a shared resource is prevented Locks are particularly useful when multiple threads need to access the value of shared data For example, an inventory application might have a thread that first confirms that an item is in stock and then decreases the number of items on hand as each sale occurs If two or more of these threads are running, then without some form of synchronization, it would be possible for one thread to be in middle of a transaction when the second thread begins its transaction The result could be that both threads would assume that adequate inventory exists, even if there is only sufficient inventory on hand to satisfy one sale In this type of situation, a lock offers a convenient means of handling the needed synchronization All locks implement the Lock interface The methods defined by Lock are shown in Table 26-1 In general, to acquire a lock, call lock( ) If the lock is unavailable, lock( ) will wait To release a lock, call unlock( ) To see if a lock is available, and to acquire it if it is, call tryLock( ) This method will not wait for the lock if it is unavailable Instead, it returns true if the lock is acquired and false otherwise The newCondition( ) method returns a Condition object associated with the lock Using a Condition, you gain detailed control of the lock through methods such as await( ) and signal( ), which provide functionality similar to Objectwait( ) and Objectnotify( ). vb.net ean 13 reader .NET EAN - 13 Barcode Reader for C#, VB . NET , ASP.NET Applications
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16 Sep 2008 ... Demonstrates creating EAN - 13 Barcodes with VB . NET . ... programs for hand held devices which came with an integrated barcode reader . You are the center of control when you are at the keyboard creating a Web site You can work faster if you know the shortcut commands for the more frequently used menu items On your own paper, copy and complete the chart shown below 7: 26: Go to the book Web site shown above To review the main points in this chapter select e-Review>PowerTeach Outlines> 6 Method void lock( ) void lockInterruptibly( ) throws InterruptedException Condition newCondition( ) boolean tryLock( ) } } } birt data matrix, how to install code 128 barcode font in word, word pdf 417, word 2010 ean 13, birt barcode font, birt code 39 vb.net ean 13 reader Read Barcodes from Images C#/ VB . NET - BC.NetBarcodeReader ...
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NET EAN - 13 Barcode Reader , Reading EAN - 13 barcode images in .NET, C#, VB . NET , ASP.NET applications. Description Waits until the invoking lock can be acquired Waits until the invoking lock can be acquired, unless interrupted Returns a Condition object that is associated with the invoking lock Attempts to acquire the lock This method will not wait if the lock is unavailable Instead, it returns true if the lock has been acquired and false if the lock is currently in use by another thread 24 25 26 boolean tryLock(long wait, TimeUnit tu) Attempts to acquire the lock If the lock is unavailable, throws InterruptedException this method will wait no longer than the period specified by wait, which is in tu units It returns true if the lock has been acquired and false if the lock cannot be acquired within the specified period void unlock( ) TABLE 26-1 Listing 7-16 The JAD file for Listing 7-15 vb.net ean 13 reader EAN - 13 VB . NET DLL - KeepAutomation.com
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NET. Free demo download. How to read, scan EAN - 13 linear barcode image in . NET applications ... High-quality barcode reader ; C#, VB . NET sample code ... javautilconcurrentlocks supplies an implementation of Lock called ReentrantLock ReentrantLock implements a reentrant lock, which is a lock that can be repeatedly entered by the thread that currently holds the lock (Of course, in the case of a thread reentering a lock, all calls to lock( ) must be offset by an equal number of calls to unlock( )) Otherwise, a thread seeking to acquire the lock will suspend until the lock is not in use The following program demonstrates the use of a lock It creates two threads that access a shared resource called Sharedcount Before a thread can access Sharedcount, it must obtain a lock After obtaining the lock, Sharedcount is incremented and then, before releasing the lock, the thread sleeps This causes the second thread to attempt to obtain the lock However, because the lock is still held by the first thread, the second thread must wait until the first thread stops sleeping and releases the lock The output shows that access to Sharedcount is, indeed, synchronized by the lock Language Arts Write Web Text Rewrite the following text for use on a Web page Use headings and bulleted lists to break the text into smaller sections Then, create a basic Web page using your revised text // A simple lock example import javautilconcurrentlocks*; class LockDemo { public static void main(String args[]) { ReentrantLock lock = new ReentrantLock(); new LockThread(lock, "A"); new LockThread(lock, "B"); } } MIDlet-Name: TextExample MIDlet-Version: 10 MIDlet-Vendor: MyCompany MIDlet-Jar-URL: TextExamplejar MIDlet-1: TextExample, , TextExample MicroEdition-Configuration: CLDC-10 MicroEdition-Profile: MIDP-10 MIDlet-JAR-SIZE: 100 Part II: Cape Cod, Massachusetts, is a popular vacation destination In the summer, you can swim in the ocean, go on a whale-watching expedition, or walk the beach on Cape Cod Bay In the fall, you can take nature walks at the National Seashore, attend cranberry harvest festivals, or visit Plymouth Plantation to learn how the pilgrims lived Many people also visit Cape Cod in the winter to enjoy the snow and to attend the holiday festivals If you are planning a visit to Cape Cod in the spring, plan to spend time visiting the many museums, parks, and other historical monuments vb.net ean 13 reader VB . NET Image: VB Code to Read and Recognize EAN - 13 Barcode from ...
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