Examples of org.apache.derbyTesting.functionTests.util.Barrier.await()

Package org.apache.derbyTesting.functionTests.util

Class org.apache.derbyTesting.functionTests.util.Barrier

Examples of org.apache.derbyTesting.functionTests.util.Barrier.await()

org.apache.derbyTesting.functionTests.util.Barrier.await()
Wait until {@code numThreads} have called {@code await()} on thisbarrier, then proceed. @throws InterruptedException if the thread is interrupted whilewaiting for the other threads to reach the barrier.

                        JDBC.assertSingleValueResultSet(
                                select.executeQuery(), "456");


                        // Now we've got the read lock. Wait until all threads
                        // have it before attempting to get the write lock.
                        readLockBarrier.await();


                        // All threads have the read lock. Now all should try
                        // to update the row and thereby create a deadlock.
                        assertUpdateCount(update, 1);

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        Thread t = new Thread(new Runnable() {
                public void run() {
                    try {
                        // Let the main thread know the helper thread has
                        // started. The race for the locks can start.
                        barrier.await();


                        // This statement will be blocked because T1 holds
                        // an exclusive lock on the row we want.
                        JDBC.assertDrainResults(ps2.executeQuery());
                    } catch (SQLException e) {

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            });
        t.start();


        // Wait until the helper thread has started. Once the call returns,
        // both threads are ready, and the race for the locks can start.
        barrier.await();


        // This statement will be blocked because T2 holds an exclusive lock
        // on the row we want. So now we have T1 waiting for T2, and T2 waiting
        // for T1, and one of the transactions should be terminated because of
        // the deadlock.

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                        JDBC.assertSingleValueResultSet(
                                select.executeQuery(), "456");


                        // Now we've got the read lock. Wait until all threads
                        // have it before attempting to get the write lock.
                        readLockBarrier.await();


                        // All threads have the read lock. Now all should try
                        // to update the row and thereby create a deadlock.
                        assertUpdateCount(update, 1);

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                s.close();


                // Tell the main thread that we've locked the row and that
                // it can go ahead with the index scan. Wait here until the
                // main thread has started the scan.
                barrier.await();


                // The main thread has started the index scan. Give it a
                // second to get to the row we have locked.
                Thread.sleep(1000L);

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            // Once we have fetched the first row, tell the helper thread we
            // have started the index scan, and wait until it has locked the
            // row that should block the scan (x=40).
            if (i == 0) {
                barrier.await();
            }
        }
        assertFalse(rs.next());
        rs.close();
    }

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                Statement s = conn.createStatement();
                s.executeUpdate("update t set x = x where x = 40");


                // Tell the main thread we have locked the row, and wait for
                // it to start the index scan.
                barrier.await();


                // Give the index scan time to get to the row we have locked.
                Thread.sleep(1000);


                // The index scan should be blocked now. Split the first leaf

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            // Once we have fetched the first row, tell the helper thread we
            // have started the index scan, and wait until it has locked the
            // row that should block the scan (x=40).
            if (i == 0) {
                barrier.await();
            }
        }
        assertFalse(rs.next());
        rs.close();
    }

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        Thread t = new Thread(new Runnable() {
                public void run() {
                    try {
                        // Let the main thread know the helper thread has
                        // started. The race for the locks can start.
                        barrier.await();


                        // This statement will be blocked because T1 holds
                        // an exclusive lock on the row we want.
                        JDBC.assertDrainResults(ps2.executeQuery());
                    } catch (SQLException e) {

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            });
        t.start();


        // Wait until the helper thread has started. Once the call returns,
        // both threads are ready, and the race for the locks can start.
        barrier.await();


        // This statement will be blocked because T2 holds an exclusive lock
        // on the row we want. So now we have T1 waiting for T2, and T2 waiting
        // for T1, and one of the transactions should be terminated because of
        // the deadlock.

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