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src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp@a61af66fc99e (annotated)
src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp
Sat, 01 Dec 2007 00:00:00 +0000
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- duke
- date
- Sat, 01 Dec 2007 00:00:00 +0000
- changeset 435
- a61af66fc99e
- child 1580
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| duke@435 | 1 | /* |
| duke@435 | 2 | * Copyright 2002-2005 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/_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 |
| duke@435 | 35 | void CMSLockVerifier::assert_locked(const Mutex* lock, const Mutex* p_lock) { |
| duke@435 | 36 | if (!Universe::is_fully_initialized()) { |
| duke@435 | 37 | return; |
| duke@435 | 38 | } |
| duke@435 | 39 | |
| duke@435 | 40 | Thread* myThread = Thread::current(); |
| duke@435 | 41 | |
| duke@435 | 42 | if (lock == NULL) { // a "lock-free" structure, e.g. MUT, protected by CMS token |
| duke@435 | 43 | assert(p_lock == NULL, "Unexpected state"); |
| duke@435 | 44 | if (myThread->is_ConcurrentGC_thread()) { |
| duke@435 | 45 | // This test might have to change in the future, if there can be |
| duke@435 | 46 | // multiple peer CMS threads. But for now, if we're testing the CMS |
| duke@435 | 47 | assert(myThread == ConcurrentMarkSweepThread::cmst(), |
| duke@435 | 48 | "In CMS, CMS thread is the only Conc GC thread."); |
| duke@435 | 49 | assert(ConcurrentMarkSweepThread::cms_thread_has_cms_token(), |
| duke@435 | 50 | "CMS thread should have CMS token"); |
| duke@435 | 51 | } else if (myThread->is_VM_thread()) { |
| duke@435 | 52 | assert(ConcurrentMarkSweepThread::vm_thread_has_cms_token(), |
| duke@435 | 53 | "VM thread should have CMS token"); |
| duke@435 | 54 | } else { |
| duke@435 | 55 | // Token should be held on our behalf by one of the other |
| duke@435 | 56 | // of CMS or VM thread; not enough easily testable |
| duke@435 | 57 | // state info to test which here. |
| duke@435 | 58 | assert(myThread->is_GC_task_thread(), "Unexpected thread type"); |
| duke@435 | 59 | } |
| duke@435 | 60 | return; |
| duke@435 | 61 | } |
| duke@435 | 62 | |
| duke@435 | 63 | if (ParallelGCThreads == 0) { |
| duke@435 | 64 | assert_lock_strong(lock); |
| duke@435 | 65 | } else { |
| duke@435 | 66 | if (myThread->is_VM_thread() |
| duke@435 | 67 | || myThread->is_ConcurrentGC_thread() |
| duke@435 | 68 | || myThread->is_Java_thread()) { |
| duke@435 | 69 | // Make sure that we are holding the associated lock. |
| duke@435 | 70 | assert_lock_strong(lock); |
| duke@435 | 71 | // The checking of p_lock is a spl case for CFLS' free list |
| duke@435 | 72 | // locks: we make sure that none of the parallel GC work gang |
| duke@435 | 73 | // threads are holding "sub-locks" of freeListLock(). We check only |
| duke@435 | 74 | // the parDictionaryAllocLock because the others are too numerous. |
| duke@435 | 75 | // This spl case code is somewhat ugly and any improvements |
| duke@435 | 76 | // are welcome XXX FIX ME!! |
| duke@435 | 77 | if (p_lock != NULL) { |
| duke@435 | 78 | assert(!p_lock->is_locked() || p_lock->owned_by_self(), |
| duke@435 | 79 | "Possible race between this and parallel GC threads"); |
| duke@435 | 80 | } |
| duke@435 | 81 | } else if (myThread->is_GC_task_thread()) { |
| duke@435 | 82 | // Make sure that the VM or CMS thread holds lock on our behalf |
| duke@435 | 83 | // XXX If there were a concept of a gang_master for a (set of) |
| duke@435 | 84 | // gang_workers, we could have used the identity of that thread |
| duke@435 | 85 | // for checking ownership here; for now we just disjunct. |
| duke@435 | 86 | assert(lock->owner() == VMThread::vm_thread() || |
| duke@435 | 87 | lock->owner() == ConcurrentMarkSweepThread::cmst(), |
| duke@435 | 88 | "Should be locked by VM thread or CMS thread on my behalf"); |
| duke@435 | 89 | } else { |
| duke@435 | 90 | // Make sure we didn't miss some obscure corner case |
| duke@435 | 91 | ShouldNotReachHere(); |
| duke@435 | 92 | } |
| duke@435 | 93 | } |
| duke@435 | 94 | } |
| duke@435 | 95 | #endif |
