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POShould variable be made volatile?
 

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  1. POShould variable be made volatile?
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    <p>I have a class in which there is a <code>boolean</code> variable called <code>isbeingwritten</code>. It keeps track of whether a file is being written to. A function of this class invokes a few threads which write to files. these will first check the value of the <code>isbeingwritten</code> variable and if it is <code>false</code>, set it to <code>true</code> and start writing, otherwise they will wait. At the end of writing they will change the value back to <code>false</code>. Should this variable be made <code>volatile</code>?</p> <pre><code>class A { public boolean isbeingwrittenfalse; public void func() { new thread1(); new thread2(); } class thread1 implements Runnable { Thread t; thread1() { t=new Thread (this); t.start(); } public void run() { while(isbeingwritten); isbeingwritten=true; //wrrite very long string isbeingwritten=false; } } class thread2 implements Runnable { Thread t; thread2() { t=new Thread (this); t.start(); } public void run() { while(isbeingwritten); isbeingwritten=true; //wrrite very long string isbeingwritten=false; } } </code></pre> <p>The following is the correct solution </p> <pre><code>public class XSSThread implements Runnable { Thread xt; public void init() { xt = new Thread(this); xt.start(); } public void run() { new Thread1().init(); new Thread2().init(); } public synchronized void saveToFile(String a) { File aFile = new File("filename.txt"); try { BufferedWriter out = new BufferedWriter(new FileWriter(aFile, aFile.exists())); out.write(a + "\r\n"); out.close(); } catch (IOException e) { e.printStackTrace(); } } } public class Thread1 extends XSSThread implements Runnable{ Thread xt1; public void init() { xt1 = new Thread(this); xt1.start(); } public void run() { String a;//very long string saveToFile(a); } } public class Thread2 extends XSSThread implements Runnable { Thread xt2; public void init() { xt2 = new Thread(this); xt2.start(); } public void run() { String a;//very long string saveToFile(a); } } </code></pre>
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    1. COThe synchronization is correct now. However, you should not completely change the question, because that makes it difficult for others to match it with the answers. Please change it again, so that it contains both the original and the revised question.
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