// Return thread IDs of deadlocked threads or null if any.
// It finds deadlocks involving only monitors if it's a Tiger VM.
// Otherwise, it finds deadlocks involving both monitors and
// the concurrent locks.
public long[] findDeadlockedThreads() throws IOException {
ThreadMXBean tm = getThreadMXBean();
if (supportsLockUsage && tm.isSynchronizerUsageSupported()) {
return tm.findDeadlockedThreads();
} else {
return tm.findMonitorDeadlockedThreads();
}
}
private long[] findDeadlockedThreads(ThreadMXBean mbean) {
// JDK 1.5 only supports the findMonitorDeadlockedThreads()
// method, so you need to comment out the following three lines
if (mbean.isSynchronizerUsageSupported()) {
return mbean.findDeadlockedThreads();
}
return mbean.findMonitorDeadlockedThreads();
}
/** Uses reflection to run the Java 1.6 method 'findDeadlockedThreads' on a bean. */
private static long[] findDeadlockedThreads(ThreadMXBean bean) {
try {
Method m = ThreadMXBean.class.getMethod("findDeadlockedThreads");
Object o = m.invoke(bean);
if (o instanceof long[] || o == null) return (long[]) o;
} catch (Throwable t) {
}
// fallback to the monitor'd one if anything bad happens.
return bean.findMonitorDeadlockedThreads();
}
@Override
public void handleRequestBody(SolrQueryRequest req, SolrQueryResponse rsp) throws IOException {
SimpleOrderedMap<Object> system = new SimpleOrderedMap<Object>();
rsp.add("system", system);
ThreadMXBean tmbean = ManagementFactory.getThreadMXBean();
// Thread Count
SimpleOrderedMap<Object> nl = new SimpleOrderedMap<Object>();
nl.add("current", tmbean.getThreadCount());
nl.add("peak", tmbean.getPeakThreadCount());
nl.add("daemon", tmbean.getDaemonThreadCount());
system.add("threadCount", nl);
// Deadlocks
ThreadInfo[] tinfos;
long[] tids = tmbean.findMonitorDeadlockedThreads();
if (tids != null) {
tinfos = tmbean.getThreadInfo(tids, Integer.MAX_VALUE);
NamedList<SimpleOrderedMap<Object>> lst = new NamedList<SimpleOrderedMap<Object>>();
for (ThreadInfo ti : tinfos) {
if (ti != null) {
lst.add("thread", getThreadInfo(ti, tmbean));
}
}
system.add("deadlocks", lst);
}
// Now show all the threads....
tids = tmbean.getAllThreadIds();
tinfos = tmbean.getThreadInfo(tids, Integer.MAX_VALUE);
NamedList<SimpleOrderedMap<Object>> lst = new NamedList<SimpleOrderedMap<Object>>();
for (ThreadInfo ti : tinfos) {
if (ti != null) {
lst.add("thread", getThreadInfo(ti, tmbean));
}
}
system.add("threadDump", lst);
rsp.setHttpCaching(false);
}
/* (non-Javadoc)
* @see org.epics.pvaccess.server.plugins.BeaconServerStatusProvider#getServerStatusData()
*/
public PVField getServerStatusData() {
status
.getIntField("connections")
.put(context.getTransportRegistry().numberOfActiveTransports());
status.getLongField("allocatedMemory").put(Runtime.getRuntime().totalMemory());
status.getLongField("freeMemory").put(Runtime.getRuntime().freeMemory());
ThreadMXBean threadMBean = ManagementFactory.getThreadMXBean();
status.getIntField("threads").put(threadMBean.getThreadCount());
final long[] deadlocks =
threadMBean.isSynchronizerUsageSupported()
? threadMBean.findDeadlockedThreads()
: threadMBean.findMonitorDeadlockedThreads();
status.getIntField("deadlocks").put((deadlocks != null) ? deadlocks.length : 0);
OperatingSystemMXBean osMBean = ManagementFactory.getOperatingSystemMXBean();
status.getDoubleField("averageSystemLoad").put(osMBean.getSystemLoadAverage());
return status;
}
