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src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp@c18cbe5936b8 (annotated)

src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp

Thu, 27 May 2010 19:08:38 -0700

author

trims

date

Thu, 27 May 2010 19:08:38 -0700

changeset 1907

c18cbe5936b8

parent 1580

e018e6884bd8

child 2314

f95d63e2154a

permissions

-rw-r--r--

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

duke@435	1	/*
trims@1907	2	* Copyright (c) 2002, 2005, Oracle and/or its affiliates. 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	*
trims@1907	19	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907	20	* or visit www.oracle.com if you need additional information or have any
trims@1907	21	* questions.
duke@435	22	*
duke@435	23	*/
duke@435	24
duke@435	25	# include "incls/_precompiled.incl"
duke@435	26	# include "incls/_cmsLockVerifier.cpp.incl"
duke@435	27
duke@435	28	///////////// Locking verification specific to CMS //////////////
duke@435	29	// Much like "assert_lock_strong()", except that it relaxes the
duke@435	30	// assertion somewhat for the parallel GC case, where VM thread
duke@435	31	// or the CMS thread might hold the lock on behalf of the parallel
duke@435	32	// threads. The second argument is in support of an extra locking
duke@435	33	// check for CFL spaces' free list locks.
duke@435	34	#ifndef PRODUCT
ysr@1580	35	void CMSLockVerifier::assert_locked(const Mutex* lock,
ysr@1580	36	const Mutex* p_lock1,
ysr@1580	37	const Mutex* p_lock2) {
duke@435	38	if (!Universe::is_fully_initialized()) {
duke@435	39	return;
duke@435	40	}
duke@435	41
duke@435	42	Thread* myThread = Thread::current();
duke@435	43
duke@435	44	if (lock == NULL) { // a "lock-free" structure, e.g. MUT, protected by CMS token
ysr@1580	45	assert(p_lock1 == NULL && p_lock2 == NULL, "Unexpected caller error");
duke@435	46	if (myThread->is_ConcurrentGC_thread()) {
duke@435	47	// This test might have to change in the future, if there can be
duke@435	48	// multiple peer CMS threads. But for now, if we're testing the CMS
duke@435	49	assert(myThread == ConcurrentMarkSweepThread::cmst(),
duke@435	50	"In CMS, CMS thread is the only Conc GC thread.");
duke@435	51	assert(ConcurrentMarkSweepThread::cms_thread_has_cms_token(),
duke@435	52	"CMS thread should have CMS token");
duke@435	53	} else if (myThread->is_VM_thread()) {
duke@435	54	assert(ConcurrentMarkSweepThread::vm_thread_has_cms_token(),
duke@435	55	"VM thread should have CMS token");
duke@435	56	} else {
duke@435	57	// Token should be held on our behalf by one of the other
duke@435	58	// of CMS or VM thread; not enough easily testable
duke@435	59	// state info to test which here.
duke@435	60	assert(myThread->is_GC_task_thread(), "Unexpected thread type");
duke@435	61	}
duke@435	62	return;
duke@435	63	}
duke@435	64
ysr@1580	65	if (myThread->is_VM_thread()
ysr@1580	66	|| myThread->is_ConcurrentGC_thread()
ysr@1580	67	|| myThread->is_Java_thread()) {
ysr@1580	68	// Make sure that we are holding the associated lock.
duke@435	69	assert_lock_strong(lock);
ysr@1580	70	// The checking of p_lock is a spl case for CFLS' free list
ysr@1580	71	// locks: we make sure that none of the parallel GC work gang
ysr@1580	72	// threads are holding "sub-locks" of freeListLock(). We check only
ysr@1580	73	// the parDictionaryAllocLock because the others are too numerous.
ysr@1580	74	// This spl case code is somewhat ugly and any improvements
ysr@1580	75	// are welcome.
ysr@1580	76	assert(p_lock1 == NULL || !p_lock1->is_locked() || p_lock1->owned_by_self(),
ysr@1580	77	"Possible race between this and parallel GC threads");
ysr@1580	78	assert(p_lock2 == NULL || !p_lock2->is_locked() || p_lock2->owned_by_self(),
ysr@1580	79	"Possible race between this and parallel GC threads");
ysr@1580	80	} else if (myThread->is_GC_task_thread()) {
ysr@1580	81	// Make sure that the VM or CMS thread holds lock on our behalf
ysr@1580	82	// XXX If there were a concept of a gang_master for a (set of)
ysr@1580	83	// gang_workers, we could have used the identity of that thread
ysr@1580	84	// for checking ownership here; for now we just disjunct.
ysr@1580	85	assert(lock->owner() == VMThread::vm_thread() ||
ysr@1580	86	lock->owner() == ConcurrentMarkSweepThread::cmst(),
ysr@1580	87	"Should be locked by VM thread or CMS thread on my behalf");
ysr@1580	88	if (p_lock1 != NULL) {
ysr@1580	89	assert_lock_strong(p_lock1);
ysr@1580	90	}
ysr@1580	91	if (p_lock2 != NULL) {
ysr@1580	92	assert_lock_strong(p_lock2);
ysr@1580	93	}
duke@435	94	} else {
ysr@1580	95	// Make sure we didn't miss some other thread type calling into here;
ysr@1580	96	// perhaps as a result of future VM evolution.
ysr@1580	97	ShouldNotReachHere();
duke@435	98	}
duke@435	99	}
duke@435	100	#endif