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} Systemoutprintln("Terminating thread: " + tName ); } } class Demo { public static void main (String args []) { MyThread thread1 = new MyThread ("1"); MyThread thread2 = new MyThread ("2"); MyThread thread3 = new MyThread ("3"); MyThread thread4 = new MyThread ("4"); Systemoutprintln("Thread Status: Alive"); Systemoutprintln("Thread 1: " + thread1tisAlive()); Systemoutprintln("Thread 2: " + thread2tisAlive()); Systemoutprintln("Thread 3: " + thread3tisAlive()); Systemoutprintln("Thread 4: " + thread4tisAlive()); try { Systemoutprintln("Threads Joining"); thread1tjoin(); thread2tjoin(); thread3tjoin(); thread4tjoin(); } catch (InterruptedException e) { Systemoutprintln( "Exception: Thread main interrupted"); } Systemoutprintln("Thread Status: Alive"); Systemoutprintln("Thread 1: " + thread1tisAlive()); Systemoutprintln("Thread 2: " + thread2tisAlive()); Systemoutprintln("Thread 3: " + thread3tisAlive()); Systemoutprintln("Thread 4: " + thread4tisAlive()); Systemoutprintln( "Terminating thread: main thread"); } }
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CHAPTER 10 Multithreading
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Previously in this chapter, you learned that each thread has an assigned priority that is used to let more important threads use resources ahead of lower-priority resources Priority is used as a guide for the operating system to determine which thread gets accesses to a resource such as the CPU In reality, an operating system takes other factors into consideration Typically, programmers have little or no control over those other factors Therefore, they establish a priority for their threads without further concern over those other factors A priority is an integer from 1 to 10 inclusive, where 10 is the highest priority, referred to as the maximum priority, and 1 is the lowest priority, also known as the minimum priority The normal priority is 5, which is the default priority for each thread In general, a thread with a higher priority bumps a thread with a lower priority from using a resource The lower-priority thread pauses until the higher-priority thread is finished using the resource Whenever two threads of equal priority need the same resource, the thread that accesses the resource first has use of the resource What happens to the second thread depends on the operating system under which your program is running Some operating systems force the second thread to wait until the first thread is finished with the resource Other operating systems require the first thread to give the second thread access to the resource after a specified time period This is to ensure that one thread doesn t hog a resource and prevent other threads from utilizing it In the real world, the first thread usually pauses while using the resource because another resource it needs isn t available It is during this pause that the operating system has the first thread relinquish the resource The problem is, you don t know if and when the pause will occur It is best to always cause a thread to pause periodically whenever the thread is using a resource for a long period time In this way, the thread shares the resource with other threads You learn how to pause a thread in the Suspending and Resuming a Thread section of this chapter You need to keep in mind that there is a downside to periodically pausing a thread Pausing a thread diminishes the performance of your program and could cause a backlog for use of the resource Therefore, you need to monitor the performance of your program regularly to make sure you are not experiencing this negative aspect of pausing a thread For now let s focus on something you do have control over setting the priority of a thread You set a thread s priority by calling the setPriority() method, which is defined in the Thread class The setPriority() method requires one parameter, which is the integer representing the level of priority You have two ways in which to represent the priority You can use an integer from 1 to 10, or you can use
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