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src/hotspot/share/runtime/serviceThread.cpp

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  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";
  51   Handle string = java_lang_String::create_from_str(name, CHECK);
  52 
  53   // Initialize thread_oop to put it into the system threadGroup
  54   Handle thread_group (THREAD, Universe::system_thread_group());
  55   Handle thread_oop = JavaCalls::construct_new_instance(
  56                           SystemDictionary::Thread_klass(),
  57                           vmSymbols::threadgroup_string_void_signature(),
  58                           thread_group,
  59                           string,
  60                           CHECK);
  61 
  62   {
  63     MutexLocker mu(Threads_lock);


 107   }
 108 }
 109 
 110 void ServiceThread::service_thread_entry(JavaThread* jt, TRAPS) {
 111   OopStorage* const oopstorages[] = {
 112     JNIHandles::global_handles(),
 113     JNIHandles::weak_global_handles(),
 114     StringTable::weak_storage(),
 115     SystemDictionary::vm_weak_oop_storage()
 116   };
 117   const size_t oopstorage_count = ARRAY_SIZE(oopstorages);
 118 
 119   while (true) {
 120     bool sensors_changed = false;
 121     bool has_jvmti_events = false;
 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) {


 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 }


  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 #include "services/threadTable.hpp"
  45 
  46 ServiceThread* ServiceThread::_instance = NULL;
  47 
  48 void ServiceThread::initialize() {
  49   EXCEPTION_MARK;
  50 
  51   const char* name = "Service Thread";
  52   Handle string = java_lang_String::create_from_str(name, CHECK);
  53 
  54   // Initialize thread_oop to put it into the system threadGroup
  55   Handle thread_group (THREAD, Universe::system_thread_group());
  56   Handle thread_oop = JavaCalls::construct_new_instance(
  57                           SystemDictionary::Thread_klass(),
  58                           vmSymbols::threadgroup_string_void_signature(),
  59                           thread_group,
  60                           string,
  61                           CHECK);
  62 
  63   {
  64     MutexLocker mu(Threads_lock);


 108   }
 109 }
 110 
 111 void ServiceThread::service_thread_entry(JavaThread* jt, TRAPS) {
 112   OopStorage* const oopstorages[] = {
 113     JNIHandles::global_handles(),
 114     JNIHandles::weak_global_handles(),
 115     StringTable::weak_storage(),
 116     SystemDictionary::vm_weak_oop_storage()
 117   };
 118   const size_t oopstorage_count = ARRAY_SIZE(oopstorages);
 119 
 120   while (true) {
 121     bool sensors_changed = false;
 122     bool has_jvmti_events = false;
 123     bool has_gc_notification_event = false;
 124     bool has_dcmd_notification_event = false;
 125     bool stringtable_work = false;
 126     bool symboltable_work = false;
 127     bool resolved_method_table_work = false;
 128     bool thread_table_work = false;
 129     bool protection_domain_table_work = false;
 130     bool oopstorage_work = false;
 131     bool oopstorages_cleanup[oopstorage_count] = {}; // Zero (false) initialize.
 132     JvmtiDeferredEvent jvmti_event;
 133     {
 134       // Need state transition ThreadBlockInVM so that this thread
 135       // will be handled by safepoint correctly when this thread is
 136       // notified at a safepoint.
 137 
 138       // This ThreadBlockInVM object is not also considered to be
 139       // suspend-equivalent because ServiceThread is not visible to
 140       // external suspension.
 141 
 142       ThreadBlockInVM tbivm(jt);
 143 
 144       MonitorLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
 145       // Process all available work on each (outer) iteration, rather than
 146       // only the first recognized bit of work, to avoid frequently true early
 147       // tests from potentially starving later work.  Hence the use of
 148       // arithmetic-or to combine results; we don't want short-circuiting.
 149       while (((sensors_changed = LowMemoryDetector::has_pending_requests()) |
 150               (has_jvmti_events = JvmtiDeferredEventQueue::has_events()) |
 151               (has_gc_notification_event = GCNotifier::has_event()) |
 152               (has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification()) |
 153               (stringtable_work = StringTable::has_work()) |
 154               (symboltable_work = SymbolTable::has_work()) |
 155               (resolved_method_table_work = ResolvedMethodTable::has_work()) |
 156               (thread_table_work = ThreadTable::has_work()) |
 157               (protection_domain_table_work = SystemDictionary::pd_cache_table()->has_work()) |
 158               (oopstorage_work = needs_oopstorage_cleanup(oopstorages,
 159                                                           oopstorages_cleanup,
 160                                                           oopstorage_count)))
 161 
 162              == 0) {
 163         // Wait until notified that there is some work to do.
 164         ml.wait();
 165       }
 166 
 167       if (has_jvmti_events) {
 168         jvmti_event = JvmtiDeferredEventQueue::dequeue();
 169       }
 170     }
 171 
 172     if (stringtable_work) {
 173       StringTable::do_concurrent_work(jt);
 174     }
 175 
 176     if (symboltable_work) {


 180     if (has_jvmti_events) {
 181       jvmti_event.post();
 182     }
 183 
 184     if (sensors_changed) {
 185       LowMemoryDetector::process_sensor_changes(jt);
 186     }
 187 
 188     if(has_gc_notification_event) {
 189       GCNotifier::sendNotification(CHECK);
 190     }
 191 
 192     if(has_dcmd_notification_event) {
 193       DCmdFactory::send_notification(CHECK);
 194     }
 195 
 196     if (resolved_method_table_work) {
 197       ResolvedMethodTable::do_concurrent_work(jt);
 198     }
 199 
 200     if (thread_table_work) {
 201        ThreadTable::do_concurrent_work(jt);
 202     }
 203 
 204     if (protection_domain_table_work) {
 205       SystemDictionary::pd_cache_table()->unlink();
 206     }
 207 
 208     if (oopstorage_work) {
 209       cleanup_oopstorages(oopstorages, oopstorages_cleanup, oopstorage_count);
 210     }
 211   }
 212 }
 213 
 214 bool ServiceThread::is_service_thread(Thread* thread) {
 215   return thread == _instance;
 216 }
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