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src/hotspot/share/runtime/serviceThread.cpp

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  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/protectionDomainCache.hpp"
  27 #include "classfile/stringTable.hpp"
  28 #include "classfile/symbolTable.hpp"
  29 #include "classfile/systemDictionary.hpp"
  30 #include "memory/universe.hpp"
  31 #include "runtime/handles.inline.hpp"
  32 #include "runtime/interfaceSupport.inline.hpp"
  33 #include "runtime/javaCalls.hpp"
  34 #include "runtime/jniHandles.hpp"
  35 #include "runtime/serviceThread.hpp"
  36 #include "runtime/mutexLocker.hpp"
  37 #include "runtime/os.hpp"
  38 #include "prims/jvmtiImpl.hpp"
  39 #include "prims/resolvedMethodTable.hpp"
  40 #include "services/diagnosticArgument.hpp"
  41 #include "services/diagnosticFramework.hpp"
  42 #include "services/gcNotifier.hpp"
  43 #include "services/lowMemoryDetector.hpp"
  44 
  45 ServiceThread* ServiceThread::_instance = NULL;
  46 
  47 void ServiceThread::initialize() {
  48   EXCEPTION_MARK;
  49 
  50   const char* name = "Service Thread";


 122     bool has_gc_notification_event = false;
 123     bool has_dcmd_notification_event = false;
 124     bool stringtable_work = false;
 125     bool symboltable_work = false;
 126     bool resolved_method_table_work = false;
 127     bool protection_domain_table_work = false;
 128     bool oopstorage_work = false;
 129     bool oopstorages_cleanup[oopstorage_count] = {}; // Zero (false) initialize.
 130     JvmtiDeferredEvent jvmti_event;
 131     {
 132       // Need state transition ThreadBlockInVM so that this thread
 133       // will be handled by safepoint correctly when this thread is
 134       // notified at a safepoint.
 135 
 136       // This ThreadBlockInVM object is not also considered to be
 137       // suspend-equivalent because ServiceThread is not visible to
 138       // external suspension.
 139 
 140       ThreadBlockInVM tbivm(jt);
 141 
 142       MonitorLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
 143       // Process all available work on each (outer) iteration, rather than
 144       // only the first recognized bit of work, to avoid frequently true early
 145       // tests from potentially starving later work.  Hence the use of
 146       // arithmetic-or to combine results; we don't want short-circuiting.
 147       while (((sensors_changed = LowMemoryDetector::has_pending_requests()) |
 148               (has_jvmti_events = JvmtiDeferredEventQueue::has_events()) |
 149               (has_gc_notification_event = GCNotifier::has_event()) |
 150               (has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification()) |
 151               (stringtable_work = StringTable::has_work()) |
 152               (symboltable_work = SymbolTable::has_work()) |
 153               (resolved_method_table_work = ResolvedMethodTable::has_work()) |
 154               (protection_domain_table_work = SystemDictionary::pd_cache_table()->has_work()) |
 155               (oopstorage_work = needs_oopstorage_cleanup(oopstorages,
 156                                                           oopstorages_cleanup,
 157                                                           oopstorage_count)))
 158 
 159              == 0) {
 160         // Wait until notified that there is some work to do.
 161         ml.wait();
 162       }
 163 
 164       if (has_jvmti_events) {
 165         jvmti_event = JvmtiDeferredEventQueue::dequeue();
 166       }
 167     }
 168 
 169     if (stringtable_work) {
 170       StringTable::do_concurrent_work(jt);
 171     }
 172 
 173     if (symboltable_work) {
 174       SymbolTable::do_concurrent_work(jt);
 175     }
 176 
 177     if (has_jvmti_events) {
 178       jvmti_event.post();
 179     }
 180 
 181     if (sensors_changed) {
 182       LowMemoryDetector::process_sensor_changes(jt);
 183     }
 184 
 185     if(has_gc_notification_event) {
 186       GCNotifier::sendNotification(CHECK);
 187     }
 188 
 189     if(has_dcmd_notification_event) {
 190       DCmdFactory::send_notification(CHECK);
 191     }
 192 
 193     if (resolved_method_table_work) {
 194       ResolvedMethodTable::do_concurrent_work(jt);
 195     }
 196 
 197     if (protection_domain_table_work) {
 198       SystemDictionary::pd_cache_table()->unlink();
 199     }
 200 
 201     if (oopstorage_work) {
 202       cleanup_oopstorages(oopstorages, oopstorages_cleanup, oopstorage_count);
 203     }
 204   }
 205 }
 206 
 207 bool ServiceThread::is_service_thread(Thread* thread) {
 208   return thread == _instance;
 209 }


  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/protectionDomainCache.hpp"
  27 #include "classfile/stringTable.hpp"
  28 #include "classfile/symbolTable.hpp"
  29 #include "classfile/systemDictionary.hpp"

  30 #include "runtime/handles.inline.hpp"
  31 #include "runtime/interfaceSupport.inline.hpp"
  32 #include "runtime/javaCalls.hpp"
  33 #include "runtime/jniHandles.hpp"
  34 #include "runtime/serviceThread.hpp"
  35 #include "runtime/mutexLocker.hpp"
  36 #include "runtime/os.hpp"
  37 #include "prims/jvmtiImpl.hpp"
  38 #include "prims/resolvedMethodTable.hpp"
  39 #include "services/diagnosticArgument.hpp"
  40 #include "services/diagnosticFramework.hpp"
  41 #include "services/gcNotifier.hpp"
  42 #include "services/lowMemoryDetector.hpp"
  43 
  44 ServiceThread* ServiceThread::_instance = NULL;
  45 
  46 void ServiceThread::initialize() {
  47   EXCEPTION_MARK;
  48 
  49   const char* name = "Service Thread";


 121     bool has_gc_notification_event = false;
 122     bool has_dcmd_notification_event = false;
 123     bool stringtable_work = false;
 124     bool symboltable_work = false;
 125     bool resolved_method_table_work = false;
 126     bool protection_domain_table_work = false;
 127     bool oopstorage_work = false;
 128     bool oopstorages_cleanup[oopstorage_count] = {}; // Zero (false) initialize.
 129     JvmtiDeferredEvent jvmti_event;
 130     {
 131       // Need state transition ThreadBlockInVM so that this thread
 132       // will be handled by safepoint correctly when this thread is
 133       // notified at a safepoint.
 134 
 135       // This ThreadBlockInVM object is not also considered to be
 136       // suspend-equivalent because ServiceThread is not visible to
 137       // external suspension.
 138 
 139       ThreadBlockInVM tbivm(jt);
 140 
 141       MonitorLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
 142       // Process all available work on each (outer) iteration, rather than
 143       // only the first recognized bit of work, to avoid frequently true early
 144       // tests from potentially starving later work.  Hence the use of
 145       // arithmetic-or to combine results; we don't want short-circuiting.
 146       while (((sensors_changed = LowMemoryDetector::has_pending_requests()) |
 147               (has_jvmti_events = JvmtiDeferredEventQueue::has_events()) |
 148               (has_gc_notification_event = GCNotifier::has_event()) |
 149               (has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification()) |
 150               (stringtable_work = StringTable::has_work()) |
 151               (symboltable_work = SymbolTable::has_work()) |
 152               (resolved_method_table_work = ResolvedMethodTable::has_work()) |
 153               (protection_domain_table_work = SystemDictionary::pd_cache_table()->has_work()) |
 154               (oopstorage_work = needs_oopstorage_cleanup(oopstorages,
 155                                                           oopstorages_cleanup,
 156                                                           oopstorage_count)))
 157 
 158              == 0) {
 159         // Wait until notified that there is some work to do.
 160         ml.wait(Mutex::_no_safepoint_check_flag);
 161       }
 162 
 163       if (has_jvmti_events) {
 164         jvmti_event = JvmtiDeferredEventQueue::dequeue();
 165       }
 166     }
 167 
 168     if (stringtable_work) {
 169       StringTable::do_concurrent_work(jt);
 170     }
 171 
 172     if (symboltable_work) {
 173       SymbolTable::do_concurrent_work(jt);
 174     }
 175 
 176     if (has_jvmti_events) {
 177       jvmti_event.post();
 178     }
 179 
 180     if (sensors_changed) {
 181       LowMemoryDetector::process_sensor_changes(jt);
 182     }
 183 
 184     if(has_gc_notification_event) {
 185       GCNotifier::sendNotification(CHECK);
 186     }
 187 
 188     if(has_dcmd_notification_event) {
 189       DCmdFactory::send_notification(CHECK);
 190     }
 191 
 192     if (resolved_method_table_work) {
 193       ResolvedMethodTable::unlink();
 194     }
 195 
 196     if (protection_domain_table_work) {
 197       SystemDictionary::pd_cache_table()->unlink();
 198     }
 199 
 200     if (oopstorage_work) {
 201       cleanup_oopstorages(oopstorages, oopstorages_cleanup, oopstorage_count);
 202     }
 203   }
 204 }
 205 
 206 bool ServiceThread::is_service_thread(Thread* thread) {
 207   return thread == _instance;
 208 }
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