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src/share/vm/runtime/jniPeriodicChecker.cpp@7ee622712fcf (annotated)

src/share/vm/runtime/jniPeriodicChecker.cpp

Tue, 04 Mar 2008 09:44:24 -0500

author

sbohne

date

Tue, 04 Mar 2008 09:44:24 -0500

changeset 493

7ee622712fcf

parent 435

a61af66fc99e

child 1907

c18cbe5936b8

permissions

-rw-r--r--

6666698: EnableBiasedLocking with BiasedLockingStartupDelay can block Watcher thread
Summary: Enqueue VM_EnableBiasedLocking operation asynchronously
Reviewed-by: never, xlu, kbr, acorn

duke@435	1	/*
duke@435	2	* Copyright 2007 Sun Microsystems, Inc. All Rights Reserved.
duke@435	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435	4	*
duke@435	5	* This code is free software; you can redistribute it and/or modify it
duke@435	6	* under the terms of the GNU General Public License version 2 only, as
duke@435	7	* published by the Free Software Foundation.
duke@435	8	*
duke@435	9	* This code is distributed in the hope that it will be useful, but WITHOUT
duke@435	10	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435	11	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
duke@435	12	* version 2 for more details (a copy is included in the LICENSE file that
duke@435	13	* accompanied this code).
duke@435	14	*
duke@435	15	* You should have received a copy of the GNU General Public License version
duke@435	16	* 2 along with this work; if not, write to the Free Software Foundation,
duke@435	17	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435	18	*
duke@435	19	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435	20	* CA 95054 USA or visit www.sun.com if you need additional information or
duke@435	21	* have any questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	# include "incls/_precompiled.incl"
duke@435	26	# include "incls/_jniPeriodicChecker.cpp.incl"
duke@435	27
duke@435	28
duke@435	29	// --------------------------------------------------------
duke@435	30	// Class to aid in periodic checking under CheckJNICalls
duke@435	31	class JniPeriodicCheckerTask : public PeriodicTask {
duke@435	32	public:
duke@435	33	JniPeriodicCheckerTask(int interval_time) : PeriodicTask(interval_time) {}
duke@435	34	void task() { os::run_periodic_checks(); }
duke@435	35	static void engage();
duke@435	36	static void disengage();
duke@435	37	};
duke@435	38
duke@435	39
duke@435	40	//----------------------------------------------------------
duke@435	41	// Implementation of JniPeriodicChecker
duke@435	42
duke@435	43	JniPeriodicCheckerTask* JniPeriodicChecker::_task = NULL;
duke@435	44
duke@435	45	/*
duke@435	46	* The engage() method is called at initialization time via
duke@435	47	* Thread::create_vm() to initialize the JniPeriodicChecker and
duke@435	48	* register it with the WatcherThread as a periodic task.
duke@435	49	*/
duke@435	50	void JniPeriodicChecker::engage() {
duke@435	51	if (CheckJNICalls && !is_active()) {
duke@435	52	// start up the periodic task
duke@435	53	_task = new JniPeriodicCheckerTask(10);
duke@435	54	_task->enroll();
duke@435	55	}
duke@435	56	}
duke@435	57
duke@435	58
duke@435	59	/*
duke@435	60	* the disengage() method is responsible for deactivating the periodic
duke@435	61	* task. This method is called from before_exit() in java.cpp and is only called
duke@435	62	* after the WatcherThread has been stopped.
duke@435	63	*/
duke@435	64	void JniPeriodicChecker::disengage() {
duke@435	65	if (CheckJNICalls && is_active()) {
duke@435	66	// remove JniPeriodicChecker
duke@435	67	_task->disenroll();
duke@435	68	delete _task;
duke@435	69	_task = NULL;
duke@435	70	}
duke@435	71	}
duke@435	72
duke@435	73	void jniPeriodicChecker_exit() {
duke@435	74	if (!CheckJNICalls) return;
duke@435	75	}