Mercurial > hg > truffle
view src/share/vm/gc_implementation/g1/ptrQueue.inline.hpp @ 441:da9cb4e97a5f
6770608: G1: Mutator thread can flush barrier and satb queues during safepoint
6660573: G1: BigApps Failure : guarantee(satb_mq_set.completed_buffers_num() == 0,"invariant")
Summary: When exiting a mutator thread is removed from the thread list before it has a chance to flush its SATB and barrier queues. If GC happens at this moment the objects that are refererred from these queues can be moved, which will case a crash. The fix is simply to flush the buffers before removing a thread from the list.
Reviewed-by: jcoomes, tonyp
author | iveresov |
---|---|
date | Fri, 14 Nov 2008 14:23:05 -0800 |
parents | 37f87013dfd8 |
children |
line wrap: on
line source
/* * Copyright 2001-2007 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. * */ void PtrQueue::handle_zero_index() { assert(0 == _index, "Precondition."); // This thread records the full buffer and allocates a new one (while // holding the lock if there is one). void** buf = _buf; _buf = qset()->allocate_buffer(); _sz = qset()->buffer_size(); _index = _sz; assert(0 <= _index && _index <= _sz, "Invariant."); if (buf != NULL) { if (_lock) { locking_enqueue_completed_buffer(buf); } else { qset()->enqueue_complete_buffer(buf); } } }