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 "runtime/interfaceSupport.hpp"
27 #include "runtime/javaCalls.hpp"
28 #include "runtime/serviceThread.hpp"
29 #include "runtime/mutexLocker.hpp"
30 #include "runtime/os.hpp"
31 #include "prims/jvmtiImpl.hpp"
32 #include "services/allocationContextService.hpp"
33 #include "services/diagnosticArgument.hpp"
34 #include "services/diagnosticFramework.hpp"
35 #include "services/gcNotifier.hpp"
36 #include "services/lowMemoryDetector.hpp"
37
38 ServiceThread* ServiceThread::_instance = NULL;
39
40 void ServiceThread::initialize() {
41 EXCEPTION_MARK;
42
43 InstanceKlass* klass = SystemDictionary::Thread_klass();
44 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
45
46 const char* name = "Service Thread";
47
48 Handle string = java_lang_String::create_from_str(name, CHECK);
49
50 // Initialize thread_oop to put it into the system threadGroup
51 Handle thread_group (THREAD, Universe::system_thread_group());
52 JavaValue result(T_VOID);
88 bool has_jvmti_events = false;
89 bool has_gc_notification_event = false;
90 bool has_dcmd_notification_event = false;
91 bool acs_notify = false;
92 JvmtiDeferredEvent jvmti_event;
93 {
94 // Need state transition ThreadBlockInVM so that this thread
95 // will be handled by safepoint correctly when this thread is
96 // notified at a safepoint.
97
98 // This ThreadBlockInVM object is not also considered to be
99 // suspend-equivalent because ServiceThread is not visible to
100 // external suspension.
101
102 ThreadBlockInVM tbivm(jt);
103
104 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
105 while (!(sensors_changed = LowMemoryDetector::has_pending_requests()) &&
106 !(has_jvmti_events = JvmtiDeferredEventQueue::has_events()) &&
107 !(has_gc_notification_event = GCNotifier::has_event()) &&
108 !(has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification()) &&
109 !(acs_notify = AllocationContextService::should_notify())) {
110 // wait until one of the sensors has pending requests, or there is a
111 // pending JVMTI event or JMX GC notification to post
112 Service_lock->wait(Mutex::_no_safepoint_check_flag);
113 }
114
115 if (has_jvmti_events) {
116 jvmti_event = JvmtiDeferredEventQueue::dequeue();
117 }
118 }
119
120 if (has_jvmti_events) {
121 jvmti_event.post();
122 }
123
124 if (sensors_changed) {
125 LowMemoryDetector::process_sensor_changes(jt);
126 }
127
128 if(has_gc_notification_event) {
129 GCNotifier::sendNotification(CHECK);
130 }
131
132 if(has_dcmd_notification_event) {
133 DCmdFactory::send_notification(CHECK);
134 }
135
136 if (acs_notify) {
137 AllocationContextService::notify(CHECK);
138 }
139 }
140 }
141
142 bool ServiceThread::is_service_thread(Thread* thread) {
143 return thread == _instance;
144 }
|
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 "runtime/interfaceSupport.hpp"
27 #include "runtime/javaCalls.hpp"
28 #include "runtime/serviceThread.hpp"
29 #include "runtime/mutexLocker.hpp"
30 #include "runtime/os.hpp"
31 #include "prims/jvmtiImpl.hpp"
32 #include "services/diagnosticArgument.hpp"
33 #include "services/diagnosticFramework.hpp"
34 #include "services/gcNotifier.hpp"
35 #include "services/lowMemoryDetector.hpp"
36
37 ServiceThread* ServiceThread::_instance = NULL;
38
39 void ServiceThread::initialize() {
40 EXCEPTION_MARK;
41
42 InstanceKlass* klass = SystemDictionary::Thread_klass();
43 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
44
45 const char* name = "Service Thread";
46
47 Handle string = java_lang_String::create_from_str(name, CHECK);
48
49 // Initialize thread_oop to put it into the system threadGroup
50 Handle thread_group (THREAD, Universe::system_thread_group());
51 JavaValue result(T_VOID);
87 bool has_jvmti_events = false;
88 bool has_gc_notification_event = false;
89 bool has_dcmd_notification_event = false;
90 bool acs_notify = false;
91 JvmtiDeferredEvent jvmti_event;
92 {
93 // Need state transition ThreadBlockInVM so that this thread
94 // will be handled by safepoint correctly when this thread is
95 // notified at a safepoint.
96
97 // This ThreadBlockInVM object is not also considered to be
98 // suspend-equivalent because ServiceThread is not visible to
99 // external suspension.
100
101 ThreadBlockInVM tbivm(jt);
102
103 MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
104 while (!(sensors_changed = LowMemoryDetector::has_pending_requests()) &&
105 !(has_jvmti_events = JvmtiDeferredEventQueue::has_events()) &&
106 !(has_gc_notification_event = GCNotifier::has_event()) &&
107 !(has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification())) {
108 // wait until one of the sensors has pending requests, or there is a
109 // pending JVMTI event or JMX GC notification to post
110 Service_lock->wait(Mutex::_no_safepoint_check_flag);
111 }
112
113 if (has_jvmti_events) {
114 jvmti_event = JvmtiDeferredEventQueue::dequeue();
115 }
116 }
117
118 if (has_jvmti_events) {
119 jvmti_event.post();
120 }
121
122 if (sensors_changed) {
123 LowMemoryDetector::process_sensor_changes(jt);
124 }
125
126 if(has_gc_notification_event) {
127 GCNotifier::sendNotification(CHECK);
128 }
129
130 if(has_dcmd_notification_event) {
131 DCmdFactory::send_notification(CHECK);
132 }
133 }
134 }
135
136 bool ServiceThread::is_service_thread(Thread* thread) {
137 return thread == _instance;
138 }
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