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// Various thread tests.
public class Thread_1 extends Thread
{
// The group for the workers.
static ThreadGroup subgroup;
// Which piece of test code to try.
static int test_case;
// Names of the tests.
static final int JOIN_GOOD = 0;
static final int JOIN_TIMEOUT = 1;
static final int JOIN_INTERRUPTED = 2;
static final int THREAD_EXIT = 3;
// True if this is normal; false if daemon.
boolean normal;
// The other thread in the test.
Thread_1 other;
// True when the thread has entered run().
boolean started;
public void run ()
{
try
{
if (normal)
{
System.out.println ("test " + test_case);
// Tell the main thread to start the daemon thread.
synchronized (this)
{
started = true;
notify ();
}
// Now wait for daemon to start.
synchronized (other)
{
while (! other.started)
other.wait ();
}
switch (test_case)
{
case JOIN_GOOD:
other.join ();
System.out.println ("joined");
break;
case JOIN_TIMEOUT:
other.join (10);
System.out.println (other.isAlive());
other.join ();
break;
case JOIN_INTERRUPTED:
other.join ();
System.out.println ("joined");
break;
case THREAD_EXIT:
// Nothing.
break;
default:
System.out.println ("failure");
break;
}
}
else
{
// Let the normal thread start first.
synchronized (other)
{
while (! other.started)
other.wait();
}
// Tell normal thread that we've started.
synchronized (this)
{
started = true;
notify ();
}
switch (test_case)
{
case JOIN_GOOD:
System.out.println ("daemon done");
break;
case JOIN_TIMEOUT:
sleep (50);
break;
case JOIN_INTERRUPTED:
other.interrupt ();
break;
case THREAD_EXIT:
// Wait for a while. However, don't wait indefinitely
// -- we want this thread to terminate so that the
// process won't hang if there is a bug.
sleep (10000);
System.out.println ("daemon still alive");
break;
default:
System.out.println ("failure");
break;
}
}
}
catch (InterruptedException e)
{
System.out.println ("interrupted");
}
}
public void setOther (Thread_1 x)
{
other = x;
}
Thread_1 (String name, boolean x)
{
super (subgroup, name);
normal = x;
started = false;
setDaemon (! normal);
}
// Run a single test.
static Thread_1 doit (int what)
{
// FIXME: we used to just use the same threads each time. That
// didn't work -- must debug.
Thread_1 dt = new Thread_1 ("daemon", false);
Thread_1 nt = new Thread_1 ("normal", true);
dt.setOther(nt);
nt.setOther(dt);
test_case = what;
try
{
nt.start();
dt.start();
// Don't wait for the threads if we're doing the exit test.
if (what != THREAD_EXIT)
{
nt.join ();
dt.join ();
}
}
catch (InterruptedException e)
{
System.out.println ("caught bad exception");
}
return dt;
}
public static void main (String[] args)
{
subgroup = new ThreadGroup ("sub");
doit (JOIN_GOOD);
System.out.println ("active count = " + subgroup.activeCount ());
Thread_1 dt = doit (JOIN_TIMEOUT);
// Make sure that joining a dead thread works.
System.out.println ("still alive: " + dt.isAlive ());
try
{
dt.join ();
}
catch (InterruptedException e)
{
System.out.println ("exception caught");
}
doit (JOIN_INTERRUPTED);
// Note: this test has a race conditoin. So we don't run it any
// more.
// This test must come last.
// doit (THREAD_EXIT);
}
}
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