1 /*
2 * Copyright (c) 1998, 2023, 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 *
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 int ObjectMonitor::contentions() const {
97 return Atomic::load(&_contentions);
98 }
99
100 // Add value to the contentions field.
101 inline void ObjectMonitor::add_to_contentions(int value) {
102 Atomic::add(&_contentions, value);
103 }
104
105 // Clear _owner field; current value must match old_value.
106 inline void ObjectMonitor::release_clear_owner(void* old_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));
111 #endif
112 Atomic::release_store(&_owner, (void*)nullptr);
113 log_trace(monitorinflation, owner)("release_clear_owner(): mid="
114 INTPTR_FORMAT ", old_value=" INTPTR_FORMAT,
115 p2i(this), p2i(old_value));
116 }
117
118 // Simply set _owner field to new_value; current value must match old_value.
119 // (Simple means no memory sync needed.)
120 inline void ObjectMonitor::set_owner_from(void* old_value, void* new_value) {
121 #ifdef ASSERT
122 void* prev = Atomic::load(&_owner);
123 assert(prev == old_value, "unexpected prev owner=" INTPTR_FORMAT
124 ", 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 *
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 int ObjectMonitor::contentions() const {
97 return Atomic::load(&_contentions);
98 }
99
100 // Add value to the contentions field.
101 inline void ObjectMonitor::add_to_contentions(int 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*)nullptr);
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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