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

src/share/vm/runtime/jniPeriodicChecker.cpp

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

author

aoqi

date

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

changeset 9637

eef07cd490d4

parent 6876

710a3c8b516e

permissions

-rw-r--r--

Merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2007, 2010, 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 "memory/allocation.inline.hpp"
aoqi@0	27	#include "runtime/jniPeriodicChecker.hpp"
aoqi@0	28	#include "runtime/task.hpp"
aoqi@0	29
aoqi@0	30
aoqi@0	31	// --------------------------------------------------------
aoqi@0	32	// Class to aid in periodic checking under CheckJNICalls
aoqi@0	33	class JniPeriodicCheckerTask : public PeriodicTask {
aoqi@0	34	public:
aoqi@0	35	JniPeriodicCheckerTask(int interval_time) : PeriodicTask(interval_time) {}
aoqi@0	36	void task() { os::run_periodic_checks(); }
aoqi@0	37	static void engage();
aoqi@0	38	static void disengage();
aoqi@0	39	};
aoqi@0	40
aoqi@0	41
aoqi@0	42	//----------------------------------------------------------
aoqi@0	43	// Implementation of JniPeriodicChecker
aoqi@0	44
aoqi@0	45	JniPeriodicCheckerTask* JniPeriodicChecker::_task = NULL;
aoqi@0	46
aoqi@0	47	/*
aoqi@0	48	* The engage() method is called at initialization time via
aoqi@0	49	* Thread::create_vm() to initialize the JniPeriodicChecker and
aoqi@0	50	* register it with the WatcherThread as a periodic task.
aoqi@0	51	*/
aoqi@0	52	void JniPeriodicChecker::engage() {
aoqi@0	53	if (CheckJNICalls && !is_active()) {
aoqi@0	54	// start up the periodic task
aoqi@0	55	_task = new JniPeriodicCheckerTask(10);
aoqi@0	56	_task->enroll();
aoqi@0	57	}
aoqi@0	58	}
aoqi@0	59
aoqi@0	60
aoqi@0	61	/*
aoqi@0	62	* the disengage() method is responsible for deactivating the periodic
aoqi@0	63	* task. This method is called from before_exit() in java.cpp and is only called
aoqi@0	64	* after the WatcherThread has been stopped.
aoqi@0	65	*/
aoqi@0	66	void JniPeriodicChecker::disengage() {
aoqi@0	67	if (CheckJNICalls && is_active()) {
aoqi@0	68	// remove JniPeriodicChecker
aoqi@0	69	_task->disenroll();
aoqi@0	70	delete _task;
aoqi@0	71	_task = NULL;
aoqi@0	72	}
aoqi@0	73	}
aoqi@0	74
aoqi@0	75	void jniPeriodicChecker_exit() {
aoqi@0	76	if (!CheckJNICalls) return;
aoqi@0	77	}