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src/share/vm/runtime/serviceThread.cpp@eef07cd490d4 (annotated)

src/share/vm/runtime/serviceThread.cpp

Wed, 03 Jul 2019 20:42:37 +0800

author

aoqi

date

Wed, 03 Jul 2019 20:42:37 +0800

changeset 9637

eef07cd490d4

parent 7535

7ae4e26cb1e0

permissions

-rw-r--r--

Merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation.
aoqi@0	8	*
aoqi@0	9	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	12	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	13	* accompanied this code).
aoqi@0	14	*
aoqi@0	15	* You should have received a copy of the GNU General Public License version
aoqi@0	16	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	18	*
aoqi@0	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	20	* or visit www.oracle.com if you need additional information or have any
aoqi@0	21	* questions.
aoqi@0	22	*
aoqi@0	23	*/
aoqi@0	24
aoqi@0	25	#include "precompiled.hpp"
aoqi@0	26	#include "runtime/interfaceSupport.hpp"
aoqi@0	27	#include "runtime/javaCalls.hpp"
aoqi@0	28	#include "runtime/serviceThread.hpp"
aoqi@0	29	#include "runtime/mutexLocker.hpp"
aoqi@0	30	#include "prims/jvmtiImpl.hpp"
jcoomes@7164	31	#include "services/allocationContextService.hpp"
aoqi@0	32	#include "services/gcNotifier.hpp"
aoqi@0	33	#include "services/diagnosticArgument.hpp"
aoqi@0	34	#include "services/diagnosticFramework.hpp"
aoqi@0	35
aoqi@0	36	ServiceThread* ServiceThread::_instance = NULL;
aoqi@0	37
aoqi@0	38	void ServiceThread::initialize() {
aoqi@0	39	EXCEPTION_MARK;
aoqi@0	40
aoqi@0	41	instanceKlassHandle klass (THREAD, SystemDictionary::Thread_klass());
aoqi@0	42	instanceHandle thread_oop = klass->allocate_instance_handle(CHECK);
aoqi@0	43
aoqi@0	44	const char* name = JDK_Version::is_gte_jdk17x_version() ?
aoqi@0	45	"Service Thread" : "Low Memory Detector";
aoqi@0	46
aoqi@0	47	Handle string = java_lang_String::create_from_str(name, CHECK);
aoqi@0	48
aoqi@0	49	// Initialize thread_oop to put it into the system threadGroup
aoqi@0	50	Handle thread_group (THREAD, Universe::system_thread_group());
aoqi@0	51	JavaValue result(T_VOID);
aoqi@0	52	JavaCalls::call_special(&result, thread_oop,
aoqi@0	53	klass,
aoqi@0	54	vmSymbols::object_initializer_name(),
aoqi@0	55	vmSymbols::threadgroup_string_void_signature(),
aoqi@0	56	thread_group,
aoqi@0	57	string,
aoqi@0	58	CHECK);
aoqi@0	59
aoqi@0	60	{
aoqi@0	61	MutexLocker mu(Threads_lock);
aoqi@0	62	ServiceThread* thread = new ServiceThread(&service_thread_entry);
aoqi@0	63
aoqi@0	64	// At this point it may be possible that no osthread was created for the
aoqi@0	65	// JavaThread due to lack of memory. We would have to throw an exception
aoqi@0	66	// in that case. However, since this must work and we do not allow
aoqi@0	67	// exceptions anyway, check and abort if this fails.
aoqi@0	68	if (thread == NULL || thread->osthread() == NULL) {
aoqi@0	69	vm_exit_during_initialization("java.lang.OutOfMemoryError",
aoqi@0	70	"unable to create new native thread");
aoqi@0	71	}
aoqi@0	72
aoqi@0	73	java_lang_Thread::set_thread(thread_oop(), thread);
aoqi@0	74	java_lang_Thread::set_priority(thread_oop(), NearMaxPriority);
aoqi@0	75	java_lang_Thread::set_daemon(thread_oop());
aoqi@0	76	thread->set_threadObj(thread_oop());
aoqi@0	77	_instance = thread;
aoqi@0	78
aoqi@0	79	Threads::add(thread);
aoqi@0	80	Thread::start(thread);
aoqi@0	81	}
aoqi@0	82	}
aoqi@0	83
aoqi@0	84	void ServiceThread::service_thread_entry(JavaThread* jt, TRAPS) {
aoqi@0	85	while (true) {
aoqi@0	86	bool sensors_changed = false;
aoqi@0	87	bool has_jvmti_events = false;
aoqi@0	88	bool has_gc_notification_event = false;
aoqi@0	89	bool has_dcmd_notification_event = false;
jcoomes@7164	90	bool acs_notify = false;
aoqi@0	91	JvmtiDeferredEvent jvmti_event;
aoqi@0	92	{
aoqi@0	93	// Need state transition ThreadBlockInVM so that this thread
aoqi@0	94	// will be handled by safepoint correctly when this thread is
aoqi@0	95	// notified at a safepoint.
aoqi@0	96
aoqi@0	97	// This ThreadBlockInVM object is not also considered to be
aoqi@0	98	// suspend-equivalent because ServiceThread is not visible to
aoqi@0	99	// external suspension.
aoqi@0	100
aoqi@0	101	ThreadBlockInVM tbivm(jt);
aoqi@0	102
aoqi@0	103	MutexLockerEx ml(Service_lock, Mutex::_no_safepoint_check_flag);
aoqi@0	104	while (!(sensors_changed = LowMemoryDetector::has_pending_requests()) &&
aoqi@0	105	!(has_jvmti_events = JvmtiDeferredEventQueue::has_events()) &&
aoqi@0	106	!(has_gc_notification_event = GCNotifier::has_event()) &&
jcoomes@7164	107	!(has_dcmd_notification_event = DCmdFactory::has_pending_jmx_notification()) &&
jcoomes@7164	108	!(acs_notify = AllocationContextService::should_notify())) {
aoqi@0	109	// wait until one of the sensors has pending requests, or there is a
aoqi@0	110	// pending JVMTI event or JMX GC notification to post
aoqi@0	111	Service_lock->wait(Mutex::_no_safepoint_check_flag);
aoqi@0	112	}
aoqi@0	113
aoqi@0	114	if (has_jvmti_events) {
aoqi@0	115	jvmti_event = JvmtiDeferredEventQueue::dequeue();
aoqi@0	116	}
aoqi@0	117	}
aoqi@0	118
aoqi@0	119	if (has_jvmti_events) {
aoqi@0	120	jvmti_event.post();
aoqi@0	121	}
aoqi@0	122
aoqi@0	123	if (sensors_changed) {
aoqi@0	124	LowMemoryDetector::process_sensor_changes(jt);
aoqi@0	125	}
aoqi@0	126
aoqi@0	127	if(has_gc_notification_event) {
aoqi@0	128	GCNotifier::sendNotification(CHECK);
aoqi@0	129	}
aoqi@0	130
aoqi@0	131	if(has_dcmd_notification_event) {
aoqi@0	132	DCmdFactory::send_notification(CHECK);
aoqi@0	133	}
jcoomes@7164	134
jcoomes@7164	135	if (acs_notify) {
jcoomes@7164	136	AllocationContextService::notify(CHECK);
jcoomes@7164	137	}
aoqi@0	138	}
aoqi@0	139	}
aoqi@0	140
aoqi@0	141	bool ServiceThread::is_service_thread(Thread* thread) {
aoqi@0	142	return thread == _instance;
aoqi@0	143	}