120 lines
5.2 KiB
HTML
120 lines
5.2 KiB
HTML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<meta name="DC.Title" content="Example: Thread-specific data in Java programs" />
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<meta name="abstract" content="This example shows a Java program creating thread-specific data. Because a Java thread is created on an object, the use of thread-specific data is transparent. Java is a language that performs garbage collection. Note the lack of data destructors or other cleanup action." />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<title>Example: Thread-specific data in Java programs</title>
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</head>
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<body id="rzahwex9-ex9rx"><a name="rzahwex9-ex9rx"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Example: Thread-specific data in Java programs</h1>
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<div><p>This example shows a Java™ program creating thread-specific data.
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Because a Java thread is created on an object, the use of thread-specific
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data is transparent. Java is a language that performs garbage
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collection. Note the lack of data destructors or other cleanup action.</p>
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<div class="section"><div class="note"><span class="notetitle">Note:</span> By using the code examples, you agree to the terms
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of the <a href="codedisclaimer.htm">Code license and disclaimer information</a>.</div>
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</div>
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<div class="example"> <pre>/*
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FileName: ATEST22.java
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The output of this example is as follows:
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Entered the testcase
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Create/start threads
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Thread Thread-1: Entered
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Thread Thread-1: foo(), threadSpecific data=0 2
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Thread Thread-1: bar(), threadSpecific data=0 2
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Wait for the threads to complete
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Thread Thread-2: Entered
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Thread Thread-2: foo(), threadSpecific data=1 4
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Thread Thread-2: bar(), threadSpecific data=1 4
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Testcase completed
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*/
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import java.lang.*;
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public class ATEST22 {
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public final static int NUMTHREADS = 2;
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static class theThread extends Thread {
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int threadSpecific1;
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int threadSpecific2;
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public theThread(int i, int i2) {
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threadSpecific1 = i;
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threadSpecific2 = i2;
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}
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public void run() {
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System.out.print("Thread " + getName() +
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": Entered\n");
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foo();
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return;
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}
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void foo() {
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System.out.print("Thread " + getName() +
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": foo(), threadSpecific data=" +
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String.valueOf(threadSpecific1) + " " +
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String.valueOf(threadSpecific2) + "\n");
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bar();
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}
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void bar() {
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System.out.print("Thread " + getName() +
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": bar(), threadSpecific data=" +
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String.valueOf(threadSpecific1) + " " +
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String.valueOf(threadSpecific2) + "\n");
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}
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}
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public static void main(String argv[]) {
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System.out.print("Entered the testcase\n");
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System.out.print("Create/start threads\n");
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theThread threads[] = new theThread[NUMTHREADS];
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for (int i=0; i <NUMTHREADS; ++i) {
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threads[i] = new theThread(i, (i+1)*2);
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threads[i].start();
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}
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System.out.print("Wait for the threads to complete\n");
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for (int i=0; i <NUMTHREADS; ++i) {
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try {
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threads[i].join();
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}
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catch (InterruptedException e) {
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System.out.print("Join interrupted\n");
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}
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}
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System.out.print("Testcase completed\nj");
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System.exit(0);
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}
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}
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</pre>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzahwdatco.htm" title="Typical applications that are not threaded use global storage.">Thread-specific data</a></div>
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</div>
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</div>
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</body>
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</html> |