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From "Sebastiano Vigna (JIRA)" <j...@apache.org>
Subject [jira] Created: (IO-161) FileCleaningTrackerTestCase hangs
Date Tue, 01 Apr 2008 21:43:27 GMT
FileCleaningTrackerTestCase hangs
---------------------------------

                 Key: IO-161
                 URL: https://issues.apache.org/jira/browse/IO-161
             Project: Commons IO
          Issue Type: Bug
          Components: Utilities
    Affects Versions: 1.4
         Environment: Linux sliver.usr.dsi.unimi.it 2.6.22.14-72.fc6 #1 SMP Wed Nov 21 15:12:59
EST 2007 i686 i686 i386 GNU/Linux
java version "1.5.0_10"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_10-b03)
Java HotSpot(TM) Client VM (build 1.5.0_10-b03, mixed mode, sharing)

            Reporter: Sebastiano Vigna


The following code in FileCleaningTrackerTestCase never exits, hanging the whole compilation/testing
process:

    private void waitUntilTrackCount() {
        while (theInstance.getTrackCount() != 0) {
            int total = 0;
            while (theInstance.getTrackCount() != 0) {
                byte[] b = new byte[1024 * 1024];
                b[0] = (byte) System.currentTimeMillis();
                total = total + b[0];
                System.gc();
            }
        }
    }

It is clear that in theory this code might loop forever, as the allocation of the byte arrays
might never unleash a garbage collection complete enough to deallocate all marker objects,
so to bring the track count to zero. Believe me, it's not only theory :).

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