Multithreading in Java

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Set and Obtain a Thread s Priority
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Classes javalangThread Methods void setPriority(int level) int getPriority( ) static void yield( )
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Each thread has associated with it a priority setting A thread s priority is used by the scheduler to decide when a thread gets to run Therefore, in a multithreaded application, a thread s priority determines (in part) how much CPU time a thread receives relative to the other active threads In general, low-priority threads receive little High-priority threads receive a lot Because a thread s priority affects the thread s access to the CPU, it has a profound impact on the execution characteristics of the thread and the way that the thread interacts with other threads This recipe shows how to set a thread s priority and illustrates the effect that different priorities have on thread execution It also shows how one thread can yield to another Before moving on to the recipe, it is necessary to clarify one point: Although a thread s priority does play an important role in determining when a thread gains access to the CPU, it is not the only factor If a thread is blocked, such as when waiting for a resource to become available, it will suspend, allowing another thread to execute Therefore, if a high-priority thread is waiting on some resource, a lower-priority thread will run Furthermore, in some cases a high-priority thread may actually run less frequently than a low-priority thread For example, consider a situation in which a high-priority thread is used to obtain data from a network Because data transmission over a network is relatively slow compared to the speed of the CPU, the high-priority thread will spend much of its time waiting While the high-priority thread is suspended, a lower-priority thread can execute Of course, when data becomes available, the scheduler can preempt the low-priority thread and resume execution of the high-priority thread Another factor that affects the scheduling of threads is the way the operating system implements multitasking, and whether the OS uses preemptive or nonpreemptive scheduling The key point is that just because you give one thread a high priority and another a low priority, that does not necessarily mean that one thread will run faster or more often than the other It s just that the high-priority thread has greater potential access to the CPU
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To set and obtain a thread s priority involves these steps: 1 To set a thread s priority, call setPriority( ) 2 To obtain a thread s priority, call getPriority( ) 3 To force a high-priority thread to yield to a lower-priority thread, call yield( )
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When a thread is created, it is given the same priority as the creating thread To change the priority, call setPriority( ) This is its general form: nal void setPriority(int level) Here, level specifies the new priority setting for the calling thread The value of level must be within the range MIN_PRIORITY and MAX_PRIORITY Currently, these values are 1 and 10, respectively The default priority is specified by the value NORM_PRIORITY, which is currently 5 These priorities are defined as static final variables within Thread You can obtain the current priority setting by calling the getPriority( ) method of Thread, shown here: nal int getPriority( ) The returned value will be within the range specified by MIN_PRIORITY and MAX_PRIORITY You can cause a thread to yield the CPU by calling yield( ), shown here: static void yield( ) By calling yield( ), a thread enables other threads, including lower-priority threads, to gain access to the CPU
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Example
The following example demonstrates two threads at different priorities The threads are created as instances of the PriThread class The run( ) method contains a loop that counts the number of iterations The loop stops when the count reaches 100,000,000 or the static variable stop is true Initially, stop is set to false, but the first thread to finish counting sets stop to true This causes the second thread to terminate with its next time slice After both threads stop, the number of iterations for each loop is displayed
// Demonstrate thread priorities class PriThread implements Runnable { long count; Thread thrd; static boolean stop = false; // Construct a new thread using the priority // specified by pri PriThread(String name, int pri) { thrd = new Thread(this, name); // Set priority thrdsetPriority(pri); count = 0; thrdstart(); }
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