// 7, Listing 4 public class StopMe extends Thread in Java

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// 7, Listing 4 public class StopMe extends Thread
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{ // Run method is executed when thread first started public void run() { int count = 1; Systemoutprintln ("I can count Watch me go!"); for (;;) { // Print count and increment it Systemoutprint (count++ + " "); // Sleep for half a second try { Threadsleep(500); } (InterruptedException ie) {} } } catch
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// Main method to create and start threads public static void main(String args[]) throws javaioIOException { // Create and start counting thread Thread counter = new StopMe(); counterstart(); // Prompt user and wait for input Systemoutprintln ("Press any enter to stop the thread counting"); Systeminread(); // Interrupt the thread counterstop(); } }
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Once started, the thread in this example will display an incrementing count, which will go on indefinitely without terminating To stop the thread, the Threadstop() method is used Sometimes it is absolutely necessary to stop a thread, but this method must be used with caution It is deprecated in the Java 2 platform, because of a potential problem that can cause data corruption When a thread is stopped in this way, access monitors that protect two threads from accessing the same resource concurrently are released, but the resource itself might be in an inconsistent state Although this would rarely happen, it can occur without warning For this reason, it is advised that threads regularly check whether or not they should continue (for example, by checking the state of a boolean flag), rather than having another thread invoke the stop() method NOTE An excellent example of this is shown in the Java API documentation for the javalangThreadstop() method, which includes sample code for creating a thread that polls to see if it should continue, rather than allowing itself to be "stopped"
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7233 Suspending/Resuming Threads Prior to Java 2, it was permissible to suspend and resume threads, allowing an application to pause threads without stopping them permanently This was achieved by using the Threadsuspend() and later the Threadresume() methods However, these methods have been deprecated in the Java 2 platform, as they can sometimes cause a deadlock (a situation whereby one or more threads wait for access to a resource, but the lock on the resource is not released) This can occur if a suspended thread has locked a monitor and cannot release it while suspended While the methods will still work, it is advised that they are not used 7234 Yielding CPU Time Sometimes a thread might be waiting for an event to occur, or may be entering a section of code where releasing CPU time to another thread will improve either system performance or the user experience (for example, after performing a calculation that should be displayed to the user and before starting another one) It is sometimes advantageous, in these situations, for a thread to yield CPU time to another thread rather than sleeping for a long period of time For example, while waiting for data to become available from an InputStream, a thread might yield CPU time instead of going to sleep In this situation, the static yield() method can be used instead of the sleep() method For example, for the currently running thread to yield CPU time, the following method could be invoked:
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Threadyield();
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As this statement takes only a single line of code, and does not require interaction with another thread, no example is provided Nonetheless, it is a useful method to be aware of, particularly in complex systems where many threads are fighting for CPU time Remember, too, that it is a static method that affects the currently running thread only an application cannot yield the time of a specific thread 7235 Waiting Until a Thread Is Dead Sometimes it is necessary to wait until a thread has finished its task (for example, to retrieve the results of the task by invoking a method, or reading a member variable) To determine if a thread has died (ie, if the run() method has finished), the isAlive() method, which returns a boolean value, can be invoked But continually checking the value returned by this method (known as polling), and then sleeping or yielding, is a very inefficient use of CPU time A much better way is to use the Threadjoin() method, which waits for a thread to die There is also an overloaded version of this method, which takes as a parameter a long value This version waits for a thread death or the specified number of milliseconds, whichever comes first The following example demonstrates the use of the Threadjoin() method
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// 7, Listing 5 public class WaitForDeath extends Thread { // Run method is executed when thread first started public void run() { Systemoutprintln ("This thread feels a little ill"); // Sleep for five seconds try { Threadsleep(5000); }
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catch (InterruptedException ie) {} } // Main method to create and start threads public static void main(String args[]) throws javalangInterruptedException { // Create and start dying thread Thread dying = new WaitForDeath(); dyingstart(); // Prompt user and wait for input Systemoutprintln ("Waiting for thread death"); // Wait till death dyingjoin(); Systemoutprintln ("Thread has died"); } }
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When run, the example, shows that the primary application thread launches a secondary thread and waits for its death When the secondary thread finishes its work, and its run() method terminates, the primary thread will return from the join() method and notify the user
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