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242 lines
9.3 KiB
C++
242 lines
9.3 KiB
C++
/*
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* Copyright (c) 1998, 2020, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#ifndef SHARE_RUNTIME_OBJECTMONITOR_INLINE_HPP
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#define SHARE_RUNTIME_OBJECTMONITOR_INLINE_HPP
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#include "logging/log.hpp"
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#include "runtime/atomic.hpp"
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inline intptr_t ObjectMonitor::is_entered(TRAPS) const {
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if (THREAD == _owner || THREAD->is_lock_owned((address) _owner)) {
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return 1;
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}
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return 0;
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}
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inline markWord ObjectMonitor::header() const {
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return Atomic::load(&_header);
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}
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inline volatile markWord* ObjectMonitor::header_addr() {
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assert((intptr_t)this == (intptr_t)&_header, "sync code expects this");
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return &_header;
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}
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inline void ObjectMonitor::set_header(markWord hdr) {
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Atomic::store(&_header, hdr);
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}
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inline jint ObjectMonitor::waiters() const {
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return _waiters;
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}
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// Returns NULL if DEFLATER_MARKER is observed.
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inline void* ObjectMonitor::owner() const {
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void* owner = _owner;
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return owner != DEFLATER_MARKER ? owner : NULL;
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}
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// Returns true if owner field == DEFLATER_MARKER and false otherwise.
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// This accessor is called when we really need to know if the owner
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// field == DEFLATER_MARKER and any non-NULL value won't do the trick.
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inline bool ObjectMonitor::owner_is_DEFLATER_MARKER() {
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return Atomic::load(&_owner) == DEFLATER_MARKER;
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}
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// Returns true if 'this' is being async deflated and false otherwise.
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inline bool ObjectMonitor::is_being_async_deflated() {
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return AsyncDeflateIdleMonitors && contentions() < 0;
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}
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inline void ObjectMonitor::clear() {
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assert(Atomic::load(&_header).value() != 0, "must be non-zero");
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assert(_owner == NULL, "must be NULL: owner=" INTPTR_FORMAT, p2i(_owner));
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Atomic::store(&_header, markWord::zero());
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clear_common();
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}
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inline void ObjectMonitor::clear_common() {
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if (AsyncDeflateIdleMonitors) {
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// Async deflation protocol uses the header, owner and contentions
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// fields. While the ObjectMonitor being deflated is on the global
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// free list, we leave those three fields alone; contentions < 0
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// will force any racing threads to retry. The header field is used
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// by install_displaced_markword_in_object() to restore the object's
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// header so we cannot check its value here.
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guarantee(_owner == NULL || _owner == DEFLATER_MARKER,
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"must be NULL or DEFLATER_MARKER: owner=" INTPTR_FORMAT,
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p2i(_owner));
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}
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assert(contentions() <= 0, "must not be positive: contentions=%d", contentions());
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assert(_waiters == 0, "must be 0: waiters=%d", _waiters);
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assert(_recursions == 0, "must be 0: recursions=" INTX_FORMAT, _recursions);
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assert(_object != NULL, "must be non-NULL");
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set_allocation_state(Free);
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_object = NULL;
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}
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inline void* ObjectMonitor::object() const {
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return _object;
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}
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inline void* ObjectMonitor::object_addr() {
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return (void *)(&_object);
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}
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inline void ObjectMonitor::set_object(void* obj) {
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_object = obj;
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}
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// Return number of threads contending for this monitor.
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inline jint ObjectMonitor::contentions() const {
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return Atomic::load(&_contentions);
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}
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// Add value to the contentions field.
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inline void ObjectMonitor::add_to_contentions(jint value) {
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Atomic::add(&_contentions, value);
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}
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// Clear _owner field; current value must match old_value.
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inline void ObjectMonitor::release_clear_owner(void* old_value) {
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void* prev = Atomic::load(&_owner);
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ADIM_guarantee(prev == old_value, "unexpected prev owner=" INTPTR_FORMAT
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", expected=" INTPTR_FORMAT, p2i(prev), p2i(old_value));
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Atomic::release_store(&_owner, (void*)NULL);
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log_trace(monitorinflation, owner)("release_clear_owner(): mid="
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INTPTR_FORMAT ", old_value=" INTPTR_FORMAT,
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p2i(this), p2i(old_value));
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}
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// Simply set _owner field to new_value; current value must match old_value.
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// (Simple means no memory sync needed.)
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inline void ObjectMonitor::set_owner_from(void* old_value, void* new_value) {
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void* prev = Atomic::load(&_owner);
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ADIM_guarantee(prev == old_value, "unexpected prev owner=" INTPTR_FORMAT
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", expected=" INTPTR_FORMAT, p2i(prev), p2i(old_value));
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Atomic::store(&_owner, new_value);
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log_trace(monitorinflation, owner)("set_owner_from(): mid="
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INTPTR_FORMAT ", old_value=" INTPTR_FORMAT
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", new_value=" INTPTR_FORMAT, p2i(this),
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p2i(old_value), p2i(new_value));
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}
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// Simply set _owner field to new_value; current value must match old_value1 or old_value2.
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// (Simple means no memory sync needed.)
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inline void ObjectMonitor::set_owner_from(void* old_value1, void* old_value2, void* new_value) {
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void* prev = Atomic::load(&_owner);
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ADIM_guarantee(prev == old_value1 || prev == old_value2,
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"unexpected prev owner=" INTPTR_FORMAT ", expected1="
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INTPTR_FORMAT " or expected2=" INTPTR_FORMAT, p2i(prev),
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p2i(old_value1), p2i(old_value2));
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_owner = new_value;
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log_trace(monitorinflation, owner)("set_owner_from(old1=" INTPTR_FORMAT
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", old2=" INTPTR_FORMAT "): mid="
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INTPTR_FORMAT ", prev=" INTPTR_FORMAT
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", new=" INTPTR_FORMAT, p2i(old_value1),
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p2i(old_value2), p2i(this), p2i(prev),
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p2i(new_value));
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}
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// Simply set _owner field to self; current value must match basic_lock_p.
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inline void ObjectMonitor::set_owner_from_BasicLock(void* basic_lock_p, Thread* self) {
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void* prev = Atomic::load(&_owner);
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ADIM_guarantee(prev == basic_lock_p, "unexpected prev owner=" INTPTR_FORMAT
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", expected=" INTPTR_FORMAT, p2i(prev), p2i(basic_lock_p));
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// Non-null owner field to non-null owner field is safe without
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// cmpxchg() as long as all readers can tolerate either flavor.
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Atomic::store(&_owner, self);
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log_trace(monitorinflation, owner)("set_owner_from_BasicLock(): mid="
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INTPTR_FORMAT ", basic_lock_p="
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INTPTR_FORMAT ", new_value=" INTPTR_FORMAT,
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p2i(this), p2i(basic_lock_p), p2i(self));
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}
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// Try to set _owner field to new_value if the current value matches
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// old_value. Otherwise, does not change the _owner field. Returns
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// the prior value of the _owner field.
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inline void* ObjectMonitor::try_set_owner_from(void* old_value, void* new_value) {
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void* prev = Atomic::cmpxchg(&_owner, old_value, new_value);
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if (prev == old_value) {
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log_trace(monitorinflation, owner)("try_set_owner_from(): mid="
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INTPTR_FORMAT ", prev=" INTPTR_FORMAT
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", new=" INTPTR_FORMAT, p2i(this),
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p2i(prev), p2i(new_value));
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}
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return prev;
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}
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inline void ObjectMonitor::release_set_allocation_state(ObjectMonitor::AllocationState s) {
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Atomic::release_store(&_allocation_state, s);
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}
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inline void ObjectMonitor::set_allocation_state(ObjectMonitor::AllocationState s) {
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_allocation_state = s;
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}
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inline ObjectMonitor::AllocationState ObjectMonitor::allocation_state() const {
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return _allocation_state;
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}
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inline ObjectMonitor::AllocationState ObjectMonitor::allocation_state_acquire() const {
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return Atomic::load_acquire(&_allocation_state);
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}
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inline bool ObjectMonitor::is_free() const {
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return _allocation_state == Free;
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}
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inline bool ObjectMonitor::is_old() const {
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return allocation_state_acquire() == Old;
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}
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inline bool ObjectMonitor::is_new() const {
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return _allocation_state == New;
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}
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// The _next_om field can be concurrently read and modified so we
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// use Atomic operations to disable compiler optimizations that
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// might try to elide loading and/or storing this field.
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inline ObjectMonitor* ObjectMonitor::next_om() const {
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return Atomic::load(&_next_om);
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}
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// Simply set _next_om field to new_value.
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inline void ObjectMonitor::set_next_om(ObjectMonitor* new_value) {
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Atomic::store(&_next_om, new_value);
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}
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// Try to set _next_om field to new_value if the current value matches
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// old_value. Otherwise, does not change the _next_om field. Returns
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// the prior value of the _next_om field.
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inline ObjectMonitor* ObjectMonitor::try_set_next_om(ObjectMonitor* old_value, ObjectMonitor* new_value) {
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return Atomic::cmpxchg(&_next_om, old_value, new_value);
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}
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#endif // SHARE_RUNTIME_OBJECTMONITOR_INLINE_HPP
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