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src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp@710a3c8b516e (annotated)

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

Tue, 08 Aug 2017 15:57:29 +0800

author

aoqi

date

Tue, 08 Aug 2017 15:57:29 +0800

changeset 6876

710a3c8b516e

parent 2314

f95d63e2154a

parent 0

f90c822e73f8

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2002, 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 "gc_implementation/concurrentMarkSweep/cmsLockVerifier.hpp"
aoqi@0	27	#include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp"
aoqi@0	28	#include "runtime/vmThread.hpp"
aoqi@0	29
aoqi@0	30	///////////// Locking verification specific to CMS //////////////
aoqi@0	31	// Much like "assert_lock_strong()", except that it relaxes the
aoqi@0	32	// assertion somewhat for the parallel GC case, where VM thread
aoqi@0	33	// or the CMS thread might hold the lock on behalf of the parallel
aoqi@0	34	// threads. The second argument is in support of an extra locking
aoqi@0	35	// check for CFL spaces' free list locks.
aoqi@0	36	#ifndef PRODUCT
aoqi@0	37	void CMSLockVerifier::assert_locked(const Mutex* lock,
aoqi@0	38	const Mutex* p_lock1,
aoqi@0	39	const Mutex* p_lock2) {
aoqi@0	40	if (!Universe::is_fully_initialized()) {
aoqi@0	41	return;
aoqi@0	42	}
aoqi@0	43
aoqi@0	44	Thread* myThread = Thread::current();
aoqi@0	45
aoqi@0	46	if (lock == NULL) { // a "lock-free" structure, e.g. MUT, protected by CMS token
aoqi@0	47	assert(p_lock1 == NULL && p_lock2 == NULL, "Unexpected caller error");
aoqi@0	48	if (myThread->is_ConcurrentGC_thread()) {
aoqi@0	49	// This test might have to change in the future, if there can be
aoqi@0	50	// multiple peer CMS threads. But for now, if we're testing the CMS
aoqi@0	51	assert(myThread == ConcurrentMarkSweepThread::cmst(),
aoqi@0	52	"In CMS, CMS thread is the only Conc GC thread.");
aoqi@0	53	assert(ConcurrentMarkSweepThread::cms_thread_has_cms_token(),
aoqi@0	54	"CMS thread should have CMS token");
aoqi@0	55	} else if (myThread->is_VM_thread()) {
aoqi@0	56	assert(ConcurrentMarkSweepThread::vm_thread_has_cms_token(),
aoqi@0	57	"VM thread should have CMS token");
aoqi@0	58	} else {
aoqi@0	59	// Token should be held on our behalf by one of the other
aoqi@0	60	// of CMS or VM thread; not enough easily testable
aoqi@0	61	// state info to test which here.
aoqi@0	62	assert(myThread->is_GC_task_thread(), "Unexpected thread type");
aoqi@0	63	}
aoqi@0	64	return;
aoqi@0	65	}
aoqi@0	66
aoqi@0	67	if (myThread->is_VM_thread()
aoqi@0	68	|| myThread->is_ConcurrentGC_thread()
aoqi@0	69	|| myThread->is_Java_thread()) {
aoqi@0	70	// Make sure that we are holding the associated lock.
aoqi@0	71	assert_lock_strong(lock);
aoqi@0	72	// The checking of p_lock is a spl case for CFLS' free list
aoqi@0	73	// locks: we make sure that none of the parallel GC work gang
aoqi@0	74	// threads are holding "sub-locks" of freeListLock(). We check only
aoqi@0	75	// the parDictionaryAllocLock because the others are too numerous.
aoqi@0	76	// This spl case code is somewhat ugly and any improvements
aoqi@0	77	// are welcome.
aoqi@0	78	assert(p_lock1 == NULL || !p_lock1->is_locked() || p_lock1->owned_by_self(),
aoqi@0	79	"Possible race between this and parallel GC threads");
aoqi@0	80	assert(p_lock2 == NULL || !p_lock2->is_locked() || p_lock2->owned_by_self(),
aoqi@0	81	"Possible race between this and parallel GC threads");
aoqi@0	82	} else if (myThread->is_GC_task_thread()) {
aoqi@0	83	// Make sure that the VM or CMS thread holds lock on our behalf
aoqi@0	84	// XXX If there were a concept of a gang_master for a (set of)
aoqi@0	85	// gang_workers, we could have used the identity of that thread
aoqi@0	86	// for checking ownership here; for now we just disjunct.
aoqi@0	87	assert(lock->owner() == VMThread::vm_thread() ||
aoqi@0	88	lock->owner() == ConcurrentMarkSweepThread::cmst(),
aoqi@0	89	"Should be locked by VM thread or CMS thread on my behalf");
aoqi@0	90	if (p_lock1 != NULL) {
aoqi@0	91	assert_lock_strong(p_lock1);
aoqi@0	92	}
aoqi@0	93	if (p_lock2 != NULL) {
aoqi@0	94	assert_lock_strong(p_lock2);
aoqi@0	95	}
aoqi@0	96	} else {
aoqi@0	97	// Make sure we didn't miss some other thread type calling into here;
aoqi@0	98	// perhaps as a result of future VM evolution.
aoqi@0	99	ShouldNotReachHere();
aoqi@0	100	}
aoqi@0	101	}
aoqi@0	102	#endif