1 /*
2 * Copyright (c) 1998, 2021, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_RUNTIME_OBJECTMONITOR_INLINE_HPP
26 #define SHARE_RUNTIME_OBJECTMONITOR_INLINE_HPP
27
28 #include "runtime/objectMonitor.hpp"
29
30 #include "logging/log.hpp"
31 #include "oops/access.inline.hpp"
32 #include "runtime/atomic.hpp"
33 #include "runtime/synchronizer.hpp"
34
35 inline intptr_t ObjectMonitor::is_entered(JavaThread* current) const {
36 void* owner = owner_raw();
37 if (current == owner || current->is_lock_owned((address)owner)) {
38 return 1;
39 }
40 return 0;
41 }
42
43 inline markWord ObjectMonitor::header() const {
44 return Atomic::load(&_header);
45 }
46
47 inline volatile markWord* ObjectMonitor::header_addr() {
48 return &_header;
49 }
50
51 inline void ObjectMonitor::set_header(markWord hdr) {
52 Atomic::store(&_header, hdr);
53 }
54
55 inline jint ObjectMonitor::waiters() const {
56 return _waiters;
57 }
58
59 // Returns NULL if DEFLATER_MARKER is observed.
60 inline void* ObjectMonitor::owner() const {
61 void* owner = owner_raw();
62 return owner != DEFLATER_MARKER ? owner : NULL;
63 }
64
65 inline void* ObjectMonitor::owner_raw() const {
66 return Atomic::load(&_owner);
67 }
68
69 // Returns true if owner field == DEFLATER_MARKER and false otherwise.
70 // This accessor is called when we really need to know if the owner
71 // field == DEFLATER_MARKER and any non-NULL value won't do the trick.
72 inline bool ObjectMonitor::owner_is_DEFLATER_MARKER() const {
73 return owner_raw() == DEFLATER_MARKER;
74 }
75
76 // Returns true if 'this' is being async deflated and false otherwise.
77 inline bool ObjectMonitor::is_being_async_deflated() {
78 return contentions() < 0;
79 }
80
81 // Return number of threads contending for this monitor.
82 inline jint ObjectMonitor::contentions() const {
83 return Atomic::load(&_contentions);
84 }
85
86 // Add value to the contentions field.
87 inline void ObjectMonitor::add_to_contentions(jint value) {
88 Atomic::add(&_contentions, value);
89 }
90
91 // Clear _owner field; current value must match old_value.
92 inline void ObjectMonitor::release_clear_owner(void* old_value) {
93 #ifdef ASSERT
94 void* prev = Atomic::load(&_owner);
95 assert(prev == old_value, "unexpected prev owner=" INTPTR_FORMAT
96 ", expected=" INTPTR_FORMAT, p2i(prev), p2i(old_value));
97 #endif
98 Atomic::release_store(&_owner, (void*)NULL);
99 log_trace(monitorinflation, owner)("release_clear_owner(): mid="
100 INTPTR_FORMAT ", old_value=" INTPTR_FORMAT,
101 p2i(this), p2i(old_value));
102 }
103
104 // Simply set _owner field to new_value; current value must match old_value.
105 // (Simple means no memory sync needed.)
106 inline void ObjectMonitor::set_owner_from(void* old_value, void* new_value) {
107 #ifdef ASSERT
108 void* prev = Atomic::load(&_owner);
109 assert(prev == old_value, "unexpected prev owner=" INTPTR_FORMAT
110 ", expected=" INTPTR_FORMAT, p2i(prev), p2i(old_value));
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1 /*
2 * Copyright (c) 1998, 2024, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_RUNTIME_OBJECTMONITOR_INLINE_HPP
26 #define SHARE_RUNTIME_OBJECTMONITOR_INLINE_HPP
27
28 #include "runtime/objectMonitor.hpp"
29
30 #include "logging/log.hpp"
31 #include "oops/access.inline.hpp"
32 #include "runtime/atomic.hpp"
33 #include "runtime/lockStack.inline.hpp"
34 #include "runtime/synchronizer.hpp"
35
36 inline bool ObjectMonitor::is_entered(JavaThread* current) const {
37 if (LockingMode == LM_LIGHTWEIGHT) {
38 if (is_owner_anonymous()) {
39 return current->lock_stack().contains(object());
40 } else {
41 return current == owner_raw();
42 }
43 } else {
44 void* owner = owner_raw();
45 if (current == owner || current->is_lock_owned((address)owner)) {
46 return true;
47 }
48 }
49 return false;
50 }
51
52 inline markWord ObjectMonitor::header() const {
53 return Atomic::load(&_header);
54 }
55
56 inline volatile markWord* ObjectMonitor::header_addr() {
57 return &_header;
58 }
59
60 inline void ObjectMonitor::set_header(markWord hdr) {
61 Atomic::store(&_header, hdr);
62 }
63
64 inline jint ObjectMonitor::waiters() const {
65 return _waiters;
66 }
67
68 inline bool ObjectMonitor::has_owner() const {
69 void* owner = owner_raw();
70 return owner != NULL && owner != DEFLATER_MARKER;
71 }
72
73 // Returns NULL if DEFLATER_MARKER is observed.
74 inline void* ObjectMonitor::owner() const {
75 void* owner = owner_raw();
76 return owner != DEFLATER_MARKER ? owner : NULL;
77 }
78
79 inline void* ObjectMonitor::owner_raw() const {
80 return Atomic::load(&_owner);
81 }
82
83 // Returns true if owner field == DEFLATER_MARKER and false otherwise.
84 // This accessor is called when we really need to know if the owner
85 // field == DEFLATER_MARKER and any non-NULL value won't do the trick.
86 inline bool ObjectMonitor::owner_is_DEFLATER_MARKER() const {
87 return owner_raw() == DEFLATER_MARKER;
88 }
89
90 // Returns true if 'this' is being async deflated and false otherwise.
91 inline bool ObjectMonitor::is_being_async_deflated() {
92 return contentions() < 0;
93 }
94
95 // Return number of threads contending for this monitor.
96 inline jint ObjectMonitor::contentions() const {
97 return Atomic::load(&_contentions);
98 }
99
100 // Add value to the contentions field.
101 inline void ObjectMonitor::add_to_contentions(jint value) {
102 Atomic::add(&_contentions, value);
103 }
104
105 inline void ObjectMonitor::set_recursions(size_t recursions) {
106 assert(_recursions == 0, "must be");
107 assert(has_owner(), "must be owned");
108 _recursions = checked_cast<intx>(recursions);
109 }
110
111 // Clear _owner field; current value must match old_value.
112 inline void ObjectMonitor::release_clear_owner(void* old_value) {
113 #ifdef ASSERT
114 void* prev = Atomic::load(&_owner);
115 assert(prev == old_value, "unexpected prev owner=" INTPTR_FORMAT
116 ", expected=" INTPTR_FORMAT, p2i(prev), p2i(old_value));
117 #endif
118 Atomic::release_store(&_owner, (void*)NULL);
119 log_trace(monitorinflation, owner)("release_clear_owner(): mid="
120 INTPTR_FORMAT ", old_value=" INTPTR_FORMAT,
121 p2i(this), p2i(old_value));
122 }
123
124 // Simply set _owner field to new_value; current value must match old_value.
125 // (Simple means no memory sync needed.)
126 inline void ObjectMonitor::set_owner_from(void* old_value, void* new_value) {
127 #ifdef ASSERT
128 void* prev = Atomic::load(&_owner);
129 assert(prev == old_value, "unexpected prev owner=" INTPTR_FORMAT
130 ", expected=" INTPTR_FORMAT, p2i(prev), p2i(old_value));
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