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comparison src/share/vm/memory/gcLocker.inline.hpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2000-2005 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 */
24
25 inline bool GC_locker::is_active() {
26 return _lock_count > 0 || _jni_lock_count > 0;
27 }
28
29 inline bool GC_locker::check_active_before_gc() {
30 if (is_active()) {
31 set_needs_gc();
32 }
33 return is_active();
34 }
35
36 inline void GC_locker::lock() {
37 // cast away volatile
38 Atomic::inc(&_lock_count);
39 CHECK_UNHANDLED_OOPS_ONLY(
40 if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count++; })
41 assert(Universe::heap() == NULL ||
42 !Universe::heap()->is_gc_active(), "locking failed");
43 }
44
45 inline void GC_locker::unlock() {
46 // cast away volatile
47 Atomic::dec(&_lock_count);
48 CHECK_UNHANDLED_OOPS_ONLY(
49 if (CheckUnhandledOops) { Thread::current()->_gc_locked_out_count--; })
50 }
51
52 inline void GC_locker::lock_critical(JavaThread* thread) {
53 if (!thread->in_critical()) {
54 if (!needs_gc()) {
55 jni_lock();
56 } else {
57 jni_lock_slow();
58 }
59 }
60 thread->enter_critical();
61 }
62
63 inline void GC_locker::unlock_critical(JavaThread* thread) {
64 thread->exit_critical();
65 if (!thread->in_critical()) {
66 if (!needs_gc()) {
67 jni_unlock();
68 } else {
69 jni_unlock_slow();
70 }
71 }
72 }