Mercurial > hg > graal-jvmci-8
diff src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | e018e6884bd8 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,95 @@ +/* + * Copyright 2002-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +# include "incls/_precompiled.incl" +# include "incls/_cmsLockVerifier.cpp.incl" + +///////////// 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_lock) { + 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_lock == NULL, "Unexpected state"); + 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 (ParallelGCThreads == 0) { + assert_lock_strong(lock); + } else { + 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 XXX FIX ME!! + if (p_lock != NULL) { + assert(!p_lock->is_locked() || p_lock->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"); + } else { + // Make sure we didn't miss some obscure corner case + ShouldNotReachHere(); + } + } +} +#endif