Mercurial > hg > graal-compiler
view src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp @ 18027:9f169829d0e1
Merge
author | asaha |
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date | Tue, 08 Jul 2014 13:25:13 -0700 |
parents | f95d63e2154a |
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/* * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "gc_implementation/concurrentMarkSweep/cmsLockVerifier.hpp" #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" #include "runtime/vmThread.hpp" ///////////// Locking verification specific to CMS ////////////// // Much like "assert_lock_strong()", except that it relaxes the // assertion somewhat for the parallel GC case, where VM thread // or the CMS thread might hold the lock on behalf of the parallel // threads. The second argument is in support of an extra locking // check for CFL spaces' free list locks. #ifndef PRODUCT void CMSLockVerifier::assert_locked(const Mutex* lock, const Mutex* p_lock1, const Mutex* p_lock2) { if (!Universe::is_fully_initialized()) { return; } Thread* myThread = Thread::current(); if (lock == NULL) { // a "lock-free" structure, e.g. MUT, protected by CMS token assert(p_lock1 == NULL && p_lock2 == NULL, "Unexpected caller error"); if (myThread->is_ConcurrentGC_thread()) { // This test might have to change in the future, if there can be // multiple peer CMS threads. But for now, if we're testing the CMS assert(myThread == ConcurrentMarkSweepThread::cmst(), "In CMS, CMS thread is the only Conc GC thread."); assert(ConcurrentMarkSweepThread::cms_thread_has_cms_token(), "CMS thread should have CMS token"); } else if (myThread->is_VM_thread()) { assert(ConcurrentMarkSweepThread::vm_thread_has_cms_token(), "VM thread should have CMS token"); } else { // Token should be held on our behalf by one of the other // of CMS or VM thread; not enough easily testable // state info to test which here. assert(myThread->is_GC_task_thread(), "Unexpected thread type"); } return; } if (myThread->is_VM_thread() || myThread->is_ConcurrentGC_thread() || myThread->is_Java_thread()) { // Make sure that we are holding the associated lock. assert_lock_strong(lock); // The checking of p_lock is a spl case for CFLS' free list // locks: we make sure that none of the parallel GC work gang // threads are holding "sub-locks" of freeListLock(). We check only // the parDictionaryAllocLock because the others are too numerous. // This spl case code is somewhat ugly and any improvements // are welcome. assert(p_lock1 == NULL || !p_lock1->is_locked() || p_lock1->owned_by_self(), "Possible race between this and parallel GC threads"); assert(p_lock2 == NULL || !p_lock2->is_locked() || p_lock2->owned_by_self(), "Possible race between this and parallel GC threads"); } else if (myThread->is_GC_task_thread()) { // Make sure that the VM or CMS thread holds lock on our behalf // XXX If there were a concept of a gang_master for a (set of) // gang_workers, we could have used the identity of that thread // for checking ownership here; for now we just disjunct. assert(lock->owner() == VMThread::vm_thread() || lock->owner() == ConcurrentMarkSweepThread::cmst(), "Should be locked by VM thread or CMS thread on my behalf"); if (p_lock1 != NULL) { assert_lock_strong(p_lock1); } if (p_lock2 != NULL) { assert_lock_strong(p_lock2); } } else { // Make sure we didn't miss some other thread type calling into here; // perhaps as a result of future VM evolution. ShouldNotReachHere(); } } #endif