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The trouble with using isAlive( ) to wait for a thread to end is that the polling loop used to call isAlive( ) continues to consume CPU cycles while waiting In contrast, join( ) suspends execution of the invoking thread, thus freeing CPU cycles To fully understand the problem, consider this version of main( ) from the previous example It is rewritten to use isAlive( )
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// This version of main() uses isAlive() to wait for // a thread to end It is NOT as efficient as the version // that uses join() and is for demonstration purposes only // This approach is NOT recommended for real code public static void main(String args[]) { Systemoutprintln("Main thread starting"); // Construct a thread based on MyThread Thread thrd = new Thread(new MyThread()); // Start execution of thrd thrdstart(); // Wait until thrd ends while(thrdisAlive()) ; Systemoutprintln("Main thread ending"); }
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This version of main( ) will produce the same results as before However, the program is no longer written as efficiently as it was from a performance point of view The reason is that the main thread no longer suspends execution, waiting for thrd to end Instead, it continues to execute, making repeated calls to isAlive( ) This consumes many CPU cycles unnecessarily Therefore, in this case, using join( ) is a much better approach
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Synchronize Threads
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Keyword synchronized Forms synchronized type methodName(arg-list){ // synchronized method body } synchronized(objref) { // synchronized statements }
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7:
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When using multiple threads, it is sometimes necessary to prevent one thread from accessing an object that is currently in use by another This situation can occur when two or more threads need access to a shared resource that can be used by only one thread at a time For example, when one thread is writing to a file, a second thread must be prevented from doing so at the same time The mechanism by which access to an object by multiple threads is controlled is called synchronization Key to synchronization in Java is the concept of the monitor A monitor works by implementing the concept of a lock When a thread enters an object s monitor, the object is locked and no other thread can gain access to the object When the thread exits the monitor, the object is unlocked and becomes available for use by another thread All objects in Java have a monitor This feature is built into the Java language itself Thus, all objects can be synchronized Synchronization is supported by the keyword synchronized and a few well-defined methods that all objects have Since synchronization was designed into Java from the start, it is much easier to use than you might first expect In fact, for many programs, the synchronization of objects is almost transparent This recipe shows how to synchronize access to an object
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Step-by-Step
To synchronize access to an object, follow these steps: 1 You can synchronize one or more methods defined for the object by specifying the synchronized modifier When a synchronized method is called, the object is locked until the method returns 2 You can synchronize specific actions on an object by using a synchronized block of code, which is created by using the synchronized statement When a synchronized block is entered, the object is locked When the synchronized block is left, the object is unlocked
Discussion
There are two ways to synchronize access to an object First, you can modify one or more of its methods with the synchronized keyword A synchronized method has the following general form: synchronized type methodName(arg-list){ // synchronized method body } Here, type is the return type of the method and methodName is its name When a synchronized method is called on an object, that object s monitor is acquired by the calling thread and the object is locked No other thread can execute a synchronized method on the object until the thread releases the lock, either by returning from the method or by calling the wait( ) method (For an example that uses wait( ), see Communicate Between Threads) Once the monitor has been released, it can be acquired by another thread
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