RFR for JDK-8027901 Intermittent test failure java/net/ProxySelector/MultiThreadedSystemProxies.java

[Charlie Wang]

Hi Everyone,
   I am working on intermittent bug 
https://bugs.openjdk.java.net/browse/JDK-8027901. I've tried running 1K 
times and wasn't able to reproduce it. Also in recent same binaries run, 
there was no failure for this test. I wonder if it is possible that I 
add some debug output (like time stamp as in attachment.) to the test so 
I can collect more info if it fails again. Please let me know if you 
have any comments or suggestions.



- Charlie
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/*
 * @test
 * @bug 7188755
 * @run main/othervm MultiThreadedSystemProxies
 * @summary Crash due to missing synchronization on gconf_client in
 *          DefaultProxySelector.c
 */
import java.net.ProxySelector;
import java.net.URI;

/* Racey test, not guaranteed to fail, but if it does we have a problem. */

public class MultiThreadedSystemProxies {
    static final int NUM_THREADS = 100;
    static long currentTime;
    
    public static void main(String[] args) throws Exception {
        System.setProperty("java.net.useSystemProxies", "true");
        final ProxySelector ps = ProxySelector.getDefault();
        final URI uri = new URI("http://ubuntu.com");
        Thread[] threads = new Thread[NUM_THREADS];

        System.out.println("MultiThreadedSystemProxies start time: " 
                + System.currentTimeMillis());
        
        for (int i = 0; i < NUM_THREADS; i++) {
            threads[i] = new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        currentTime = System.currentTimeMillis();
                        System.out.println("Thread[" + this.toString() 
                                + "] start time: " + currentTime);
                        ps.select(uri);
                        System.out.println("Thread[" + this.toString() 
                                + "] took:" 
                                + (System.currentTimeMillis() - currentTime));
                    } catch (Exception x) {
                        throw new RuntimeException(x);
                    }
                }
            });
        }
        for (int i = 0; i < NUM_THREADS; i++) {
            threads[i].start();
        }
        for (int i = 0; i < NUM_THREADS; i++) {
            threads[i].join();
        }

        System.out.println("MultiThreadedSystemProxies end time: " 
                + System.currentTimeMillis());
    }
}