92 void ServiceThread::service_thread_entry(JavaThread* jt, TRAPS) {
93 OopStorage* const oopstorages[] = {
94 JNIHandles::global_handles(),
95 JNIHandles::weak_global_handles(),
96 StringTable::weak_storage(),
97 SystemDictionary::vm_global_oop_storage(),
98 SystemDictionary::vm_weak_oop_storage()
99 };
100 const size_t oopstorage_count = ARRAY_SIZE(oopstorages);
101
102 while (true) {
103 bool sensors_changed = false;
104 bool has_jvmti_events = false;
105 bool has_gc_notification_event = false;
106 bool has_dcmd_notification_event = false;
107 bool stringtable_work = false;
108 bool symboltable_work = false;
109 bool resolved_method_table_work = false;
110 bool protection_domain_table_work = false;
111 bool oopstorage_work = false;
112 JvmtiDeferredEvent jvmti_event;
113 {
114 // Need state transition ThreadBlockInVM so that this thread
115 // will be handled by safepoint correctly when this thread is
116 // notified at a safepoint.
117
118 // This ThreadBlockInVM object is not also considered to be
119 // suspend-equivalent because ServiceThread is not visible to
120 // external suspension.
121
122 ThreadBlockInVM tbivm(jt);
123
124 MonitorLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
125 // Process all available work on each (outer) iteration, rather than
126 // only the first recognized bit of work, to avoid frequently true early
127 // tests from potentially starving later work. Hence the use of
128 // arithmetic-or to combine results; we don't want short-circuiting.
129 while (((sensors_changed = LowMemoryDetector::has_pending_requests()) |
130 (has_jvmti_events = JvmtiDeferredEventQueue::has_events()) |
131 (has_gc_notification_event = GCNotifier::has_event()) |
132 (has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification()) |
133 (stringtable_work = StringTable::has_work()) |
134 (symboltable_work = SymbolTable::has_work()) |
135 (resolved_method_table_work = ResolvedMethodTable::has_work()) |
136 (protection_domain_table_work = SystemDictionary::pd_cache_table()->has_work()) |
137 (oopstorage_work = OopStorage::has_cleanup_work_and_reset())
138 ) == 0) {
139 // Wait until notified that there is some work to do.
140 ml.wait();
141 }
142
143 if (has_jvmti_events) {
144 jvmti_event = JvmtiDeferredEventQueue::dequeue();
145 }
146 }
147
148 if (stringtable_work) {
149 StringTable::do_concurrent_work(jt);
150 }
151
152 if (symboltable_work) {
153 SymbolTable::do_concurrent_work(jt);
154 }
155
156 if (has_jvmti_events) {
157 jvmti_event.post();
158 }
159
160 if (sensors_changed) {
162 }
163
164 if(has_gc_notification_event) {
165 GCNotifier::sendNotification(CHECK);
166 }
167
168 if(has_dcmd_notification_event) {
169 DCmdFactory::send_notification(CHECK);
170 }
171
172 if (resolved_method_table_work) {
173 ResolvedMethodTable::do_concurrent_work(jt);
174 }
175
176 if (protection_domain_table_work) {
177 SystemDictionary::pd_cache_table()->unlink();
178 }
179
180 if (oopstorage_work) {
181 cleanup_oopstorages(oopstorages, oopstorage_count);
182 }
183 }
184 }
185
186 bool ServiceThread::is_service_thread(Thread* thread) {
187 return thread == _instance;
188 }
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92 void ServiceThread::service_thread_entry(JavaThread* jt, TRAPS) {
93 OopStorage* const oopstorages[] = {
94 JNIHandles::global_handles(),
95 JNIHandles::weak_global_handles(),
96 StringTable::weak_storage(),
97 SystemDictionary::vm_global_oop_storage(),
98 SystemDictionary::vm_weak_oop_storage()
99 };
100 const size_t oopstorage_count = ARRAY_SIZE(oopstorages);
101
102 while (true) {
103 bool sensors_changed = false;
104 bool has_jvmti_events = false;
105 bool has_gc_notification_event = false;
106 bool has_dcmd_notification_event = false;
107 bool stringtable_work = false;
108 bool symboltable_work = false;
109 bool resolved_method_table_work = false;
110 bool protection_domain_table_work = false;
111 bool oopstorage_work = false;
112 bool deflate_idle_monitors = false;
113 JvmtiDeferredEvent jvmti_event;
114 {
115 // Need state transition ThreadBlockInVM so that this thread
116 // will be handled by safepoint correctly when this thread is
117 // notified at a safepoint.
118
119 // This ThreadBlockInVM object is not also considered to be
120 // suspend-equivalent because ServiceThread is not visible to
121 // external suspension.
122
123 ThreadBlockInVM tbivm(jt);
124
125 MonitorLocker ml(Service_lock, Mutex::_no_safepoint_check_flag);
126 // Process all available work on each (outer) iteration, rather than
127 // only the first recognized bit of work, to avoid frequently true early
128 // tests from potentially starving later work. Hence the use of
129 // arithmetic-or to combine results; we don't want short-circuiting.
130 while (((sensors_changed = LowMemoryDetector::has_pending_requests()) |
131 (has_jvmti_events = JvmtiDeferredEventQueue::has_events()) |
132 (has_gc_notification_event = GCNotifier::has_event()) |
133 (has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification()) |
134 (stringtable_work = StringTable::has_work()) |
135 (symboltable_work = SymbolTable::has_work()) |
136 (resolved_method_table_work = ResolvedMethodTable::has_work()) |
137 (protection_domain_table_work = SystemDictionary::pd_cache_table()->has_work()) |
138 (oopstorage_work = OopStorage::has_cleanup_work_and_reset()) |
139 (deflate_idle_monitors = ObjectSynchronizer::is_async_deflation_needed())
140 ) == 0) {
141 // Wait until notified that there is some work to do.
142 // If AsyncDeflateIdleMonitors, then we wait for
143 // GuaranteedSafepointInterval so that is_async_deflation_needed()
144 // is checked at the same interval.
145 ml.wait(AsyncDeflateIdleMonitors ? GuaranteedSafepointInterval : 0);
146 }
147
148 if (has_jvmti_events) {
149 jvmti_event = JvmtiDeferredEventQueue::dequeue();
150 }
151 }
152
153 if (stringtable_work) {
154 StringTable::do_concurrent_work(jt);
155 }
156
157 if (symboltable_work) {
158 SymbolTable::do_concurrent_work(jt);
159 }
160
161 if (has_jvmti_events) {
162 jvmti_event.post();
163 }
164
165 if (sensors_changed) {
167 }
168
169 if(has_gc_notification_event) {
170 GCNotifier::sendNotification(CHECK);
171 }
172
173 if(has_dcmd_notification_event) {
174 DCmdFactory::send_notification(CHECK);
175 }
176
177 if (resolved_method_table_work) {
178 ResolvedMethodTable::do_concurrent_work(jt);
179 }
180
181 if (protection_domain_table_work) {
182 SystemDictionary::pd_cache_table()->unlink();
183 }
184
185 if (oopstorage_work) {
186 cleanup_oopstorages(oopstorages, oopstorage_count);
187 }
188
189 if (deflate_idle_monitors) {
190 // Deflate any global idle monitors.
191 ObjectSynchronizer::deflate_global_idle_monitors_using_JT();
192
193 int count = 0;
194 for (JavaThreadIteratorWithHandle jtiwh; JavaThread *jt = jtiwh.next(); ) {
195 if (jt->om_in_use_count > 0 && !jt->is_exiting()) {
196 // This JavaThread is using ObjectMonitors so deflate any that
197 // are idle unless this JavaThread is exiting; do not race with
198 // ObjectSynchronizer::om_flush().
199 ObjectSynchronizer::deflate_per_thread_idle_monitors_using_JT(jt);
200 count++;
201 }
202 }
203 if (count > 0) {
204 log_debug(monitorinflation)("did async deflation of idle monitors for %d thread(s).", count);
205 }
206 // The ServiceThread's async deflation request has been processed.
207 ObjectSynchronizer::set_is_async_deflation_requested(false);
208 }
209 }
210 }
211
212 bool ServiceThread::is_service_thread(Thread* thread) {
213 return thread == _instance;
214 }
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