Mercurial > hg > truffle
view src/share/vm/memory/gcLocker.inline.hpp @ 480:d249b360e026
6782457: CMS: Livelock in CompactibleFreeListSpace::block_size()
6736295: SIGSEGV in product jvm, assertion "these are the only valid states during a mark sweep" in fastdebug
Summary: Restructured the code in the perm gen allocation retry loop so as to avoid "safepoint-blocking" on locks, in this case the Heap_lock, while holding uninitialized allocated heap storage.
Reviewed-by: apetrusenko, iveresov, jcoomes, jmasa, poonam
author | ysr |
---|---|
date | Wed, 10 Dec 2008 23:46:10 -0800 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 2000-2005 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. * */ inline bool GC_locker::is_active() { return _lock_count > 0 || _jni_lock_count > 0; } inline bool GC_locker::check_active_before_gc() { if (is_active()) { set_needs_gc(); } return is_active(); } inline void GC_locker::lock() { // cast away volatile Atomic::inc(&_lock_count); CHECK_UNHANDLED_OOPS_ONLY( if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count++; }) assert(Universe::heap() == NULL || !Universe::heap()->is_gc_active(), "locking failed"); } inline void GC_locker::unlock() { // cast away volatile Atomic::dec(&_lock_count); CHECK_UNHANDLED_OOPS_ONLY( if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count--; }) } inline void GC_locker::lock_critical(JavaThread* thread) { if (!thread->in_critical()) { if (!needs_gc()) { jni_lock(); } else { jni_lock_slow(); } } thread->enter_critical(); } inline void GC_locker::unlock_critical(JavaThread* thread) { thread->exit_critical(); if (!thread->in_critical()) { if (!needs_gc()) { jni_unlock(); } else { jni_unlock_slow(); } } }