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 "runtime/interfaceSupport.hpp"
27 #include "runtime/javaCalls.hpp"
28 #include "runtime/serviceThread.hpp"
29 #include "runtime/mutexLocker.hpp"
30 #include "prims/jvmtiImpl.hpp"
31 #include "services/gcNotifier.hpp"
32 #include "services/diagnosticArgument.hpp"
33 #include "services/diagnosticFramework.hpp"
34
35 ServiceThread* ServiceThread::_instance = NULL;
36
37 void ServiceThread::initialize() {
38 EXCEPTION_MARK;
39
40 instanceKlassHandle klass (THREAD, SystemDictionary::Thread_klass());
41 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
42
43 const char* name = JDK_Version::is_gte_jdk17x_version() ?
44 "Service Thread" : "Low Memory Detector";
45
46 Handle string = java_lang_String::create_from_str(name, CHECK);
47
48 // Initialize thread_oop to put it into the system threadGroup
49 Handle thread_group (THREAD, Universe::system_thread_group());
50 JavaValue result(T_VOID);
51 JavaCalls::call_special(&result, thread_oop,
52 klass,
53 vmSymbols::object_initializer_name(),
54 vmSymbols::threadgroup_string_void_signature(),
55 thread_group,
56 string,
57 CHECK);
58
59 {
60 MutexLocker mu(Threads_lock);
61 ServiceThread* thread = new ServiceThread(&service_thread_entry);
62
63 // At this point it may be possible that no osthread was created for the
64 // JavaThread due to lack of memory. We would have to throw an exception
65 // in that case. However, since this must work and we do not allow
66 // exceptions anyway, check and abort if this fails.
67 if (thread == NULL || thread->osthread() == NULL) {
68 vm_exit_during_initialization("java.lang.OutOfMemoryError",
69 "unable to create new native thread");
70 }
71
72 java_lang_Thread::set_thread(thread_oop(), thread);
73 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
74 java_lang_Thread::set_daemon(thread_oop());
75 thread->set_threadObj(thread_oop());
76 _instance = thread;
77
78 Threads::add(thread);
79 Thread::start(thread);
80 }
81 }
82
83 void ServiceThread::service_thread_entry(JavaThread* jt, TRAPS) {
84 while (true) {
85 bool sensors_changed = false;
86 bool has_jvmti_events = false;
87 bool has_gc_notification_event = false;
88 bool has_dcmd_notification_event = false;
89 JvmtiDeferredEvent jvmti_event;
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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 "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/gcNotifier.hpp"
33 #include "services/diagnosticArgument.hpp"
34 #include "services/diagnosticFramework.hpp"
35
36 ServiceThread* ServiceThread::_instance = NULL;
37
38 void ServiceThread::initialize() {
39 EXCEPTION_MARK;
40
41 instanceKlassHandle klass (THREAD, SystemDictionary::Thread_klass());
42 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
43
44 const char* name = JDK_Version::is_gte_jdk17x_version() ?
45 "Service Thread" : "Low Memory Detector";
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);
52 JavaCalls::call_special(&result, thread_oop,
53 klass,
54 vmSymbols::object_initializer_name(),
55 vmSymbols::threadgroup_string_void_signature(),
56 thread_group,
57 string,
58 CHECK);
59
60 {
61 MutexLocker mu(Threads_lock);
62 ServiceThread* thread = new ServiceThread(&service_thread_entry);
63
64 // At this point it may be possible that no osthread was created for the
65 // JavaThread due to lack of memory. We would have to throw an exception
66 // in that case. However, since this must work and we do not allow
67 // exceptions anyway, check and abort if this fails.
68 if (thread == NULL || thread->osthread() == NULL) {
69 vm_exit_during_initialization("java.lang.OutOfMemoryError",
70 os::native_thread_creation_failed_msg());
71 }
72
73 java_lang_Thread::set_thread(thread_oop(), thread);
74 java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
75 java_lang_Thread::set_daemon(thread_oop());
76 thread->set_threadObj(thread_oop());
77 _instance = thread;
78
79 Threads::add(thread);
80 Thread::start(thread);
81 }
82 }
83
84 void ServiceThread::service_thread_entry(JavaThread* jt, TRAPS) {
85 while (true) {
86 bool sensors_changed = false;
87 bool has_jvmti_events = false;
88 bool has_gc_notification_event = false;
89 bool has_dcmd_notification_event = false;
90 JvmtiDeferredEvent jvmti_event;
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