jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp@753cf9794df9

6885169: merge of 4957990 and 6863023 causes conflict on do_nmethods
Summary: After mechanically merging changes, some by-hand adjustments are needed.
Reviewed-by: ysr

     1 /*

     2  * Copyright 2002-2005 Sun Microsystems, Inc.  All Rights Reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    25 # include "incls/_precompiled.incl"

    26 # include "incls/_cmsLockVerifier.cpp.incl"

    28 ///////////// Locking verification specific to CMS //////////////

    29 // Much like "assert_lock_strong()", except that it relaxes the

    30 // assertion somewhat for the parallel GC case, where VM thread

    31 // or the CMS thread might hold the lock on behalf of the parallel

    32 // threads. The second argument is in support of an extra locking

    33 // check for CFL spaces' free list locks.

    34 #ifndef PRODUCT

    35 void CMSLockVerifier::assert_locked(const Mutex* lock, const Mutex* p_lock) {

    36   if (!Universe::is_fully_initialized()) {

    37     return;

    38   }

    40   Thread* myThread = Thread::current();

    42   if (lock == NULL) { // a "lock-free" structure, e.g. MUT, protected by CMS token

    43     assert(p_lock == NULL, "Unexpected state");

    44     if (myThread->is_ConcurrentGC_thread()) {

    45       // This test might have to change in the future, if there can be

    46       // multiple peer CMS threads.  But for now, if we're testing the CMS

    47       assert(myThread == ConcurrentMarkSweepThread::cmst(),

    48              "In CMS, CMS thread is the only Conc GC thread.");

    49       assert(ConcurrentMarkSweepThread::cms_thread_has_cms_token(),

    50              "CMS thread should have CMS token");

    51     } else if (myThread->is_VM_thread()) {

    52       assert(ConcurrentMarkSweepThread::vm_thread_has_cms_token(),

    53              "VM thread should have CMS token");

    54     } else {

    55       // Token should be held on our behalf by one of the other

    56       // of CMS or VM thread; not enough easily testable

    57       // state info to test which here.

    58       assert(myThread->is_GC_task_thread(), "Unexpected thread type");

    59     }

    60     return;

    61   }

    63   if (ParallelGCThreads == 0) {

    64     assert_lock_strong(lock);

    65   } else {

    66     if (myThread->is_VM_thread()

    67         || myThread->is_ConcurrentGC_thread()

    68         || myThread->is_Java_thread()) {

    69       // Make sure that we are holding the associated lock.

    70       assert_lock_strong(lock);

    71       // The checking of p_lock is a spl case for CFLS' free list

    72       // locks: we make sure that none of the parallel GC work gang

    73       // threads are holding "sub-locks" of freeListLock(). We check only

    74       // the parDictionaryAllocLock because the others are too numerous.

    75       // This spl case code is somewhat ugly and any improvements

    76       // are welcome XXX FIX ME!!

    77       if (p_lock != NULL) {

    78         assert(!p_lock->is_locked() || p_lock->owned_by_self(),

    79                "Possible race between this and parallel GC threads");

    80       }

    81     } else if (myThread->is_GC_task_thread()) {

    82       // Make sure that the VM or CMS thread holds lock on our behalf

    83       // XXX If there were a concept of a gang_master for a (set of)

    84       // gang_workers, we could have used the identity of that thread

    85       // for checking ownership here; for now we just disjunct.

    86       assert(lock->owner() == VMThread::vm_thread() ||

    87              lock->owner() == ConcurrentMarkSweepThread::cmst(),

    88              "Should be locked by VM thread or CMS thread on my behalf");

    89     } else {

    90       // Make sure we didn't miss some obscure corner case

    91       ShouldNotReachHere();

    92     }

    93   }

    94 }

    95 #endif

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.cpp@753cf9794df9

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