51 inline jint ObjectMonitor::waiters() const {
52 return _waiters;
53 }
54
55 // Returns NULL if DEFLATER_MARKER is observed.
56 inline void* ObjectMonitor::owner() const {
57 void* owner = _owner;
58 return owner != DEFLATER_MARKER ? owner : NULL;
59 }
60
61 // Returns true if owner field == DEFLATER_MARKER and false otherwise.
62 // This accessor is called when we really need to know if the owner
63 // field == DEFLATER_MARKER and any non-NULL value won't do the trick.
64 inline bool ObjectMonitor::owner_is_DEFLATER_MARKER() {
65 return _owner == DEFLATER_MARKER;
66 }
67
68 inline void ObjectMonitor::clear() {
69 assert(Atomic::load(&_header).value() != 0, "must be non-zero");
70 assert(_owner == NULL, "must be NULL: owner=" INTPTR_FORMAT, p2i(_owner));
71 DEBUG_ONLY(jint l_ref_count = ref_count();)
72 assert(l_ref_count == 0, "must be 0: l_ref_count=%d, ref_count=%d", l_ref_count, ref_count());
73
74 Atomic::store(&_header, markWord::zero());
75
76 clear_using_JT();
77 }
78
79 inline void ObjectMonitor::clear_using_JT() {
80 // Unlike other *_using_JT() functions, we cannot assert
81 // AsyncDeflateIdleMonitors or Thread::current()->is_Java_thread()
82 // because clear() calls this function for the rest of its checks.
83
84 if (AsyncDeflateIdleMonitors) {
85 // Async deflation protocol uses the header, owner and ref_count
86 // fields. While the ObjectMonitor being deflated is on the global free
87 // list, we leave those three fields alone; owner == DEFLATER_MARKER
88 // and ref_count < 0 will force any racing threads to retry. The
89 // header field is used by install_displaced_markword_in_object()
90 // in the last part of the deflation protocol so we cannot check
91 // its value here.
104 _object = NULL;
105 }
106
107 inline void* ObjectMonitor::object() const {
108 return _object;
109 }
110
111 inline void* ObjectMonitor::object_addr() {
112 return (void *)(&_object);
113 }
114
115 inline void ObjectMonitor::set_object(void* obj) {
116 _object = obj;
117 }
118
119 // return number of threads contending for this monitor
120 inline jint ObjectMonitor::contentions() const {
121 return _contentions;
122 }
123
124 // Set _owner field to new_value; current value must match old_value.
125 inline void ObjectMonitor::set_owner_from(void* new_value, void* old_value) {
126 void* prev = Atomic::cmpxchg(&_owner, old_value, new_value);
127 ADIM_guarantee(prev == old_value, "unexpected prev owner=" INTPTR_FORMAT
128 ", expected=" INTPTR_FORMAT, p2i(prev), p2i(old_value));
129 log_trace(monitorinflation, owner)("set_owner_from(): mid=" INTPTR_FORMAT
130 ", prev=" INTPTR_FORMAT ", new="
131 INTPTR_FORMAT, p2i(this), p2i(prev),
132 p2i(new_value));
133 }
134
135 // Simply set _owner field to new_value; current value must match old_value.
136 // (Simple means no memory sync needed.)
137 inline void ObjectMonitor::simply_set_owner_from(void* new_value, void* old_value) {
138 void* prev = _owner;
139 ADIM_guarantee(prev == old_value, "unexpected prev owner=" INTPTR_FORMAT
140 ", expected=" INTPTR_FORMAT, p2i(prev), p2i(old_value));
141 _owner = new_value;
142 log_trace(monitorinflation, owner)("simply_set_owner_from(): mid="
143 INTPTR_FORMAT ", prev=" INTPTR_FORMAT
144 ", new=" INTPTR_FORMAT, p2i(this),
145 p2i(prev), p2i(new_value));
146 }
147
148 // Simply set _owner field to new_value; current value must match old_value1 or old_value2.
149 // (Simple means no memory sync needed.)
150 inline void ObjectMonitor::simply_set_owner_from(void* new_value, void* old_value1, void* old_value2) {
151 void* prev = _owner;
152 ADIM_guarantee(prev == old_value1 || prev == old_value2,
194 _allocation_state = s;
195 }
196
197 inline ObjectMonitor::AllocationState ObjectMonitor::allocation_state() const {
198 return _allocation_state;
199 }
200
201 inline bool ObjectMonitor::is_free() const {
202 return _allocation_state == Free;
203 }
204
205 inline bool ObjectMonitor::is_old() const {
206 return _allocation_state == Old;
207 }
208
209 inline bool ObjectMonitor::is_new() const {
210 return _allocation_state == New;
211 }
212
213 inline void ObjectMonitor::dec_ref_count() {
214 // The decrement only needs to be MO_ACQ_REL since the reference
215 // counter is volatile.
216 Atomic::dec(&_ref_count);
217 // Can be negative as part of async deflation protocol.
218 jint l_ref_count = ref_count();
219 ADIM_guarantee(AsyncDeflateIdleMonitors || l_ref_count >= 0,
220 "sanity check: l_ref_count=%d, ref_count=%d", l_ref_count, ref_count());
221 }
222
223 inline void ObjectMonitor::inc_ref_count() {
224 // The increment needs to be MO_SEQ_CST so that the reference
225 // counter update is seen as soon as possible in a race with the
226 // async deflation protocol.
227 Atomic::inc(&_ref_count);
228 // Can be negative as part of async deflation protocol.
229 jint l_ref_count = ref_count();
230 ADIM_guarantee(AsyncDeflateIdleMonitors || l_ref_count > 0,
231 "sanity check: l_ref_count=%d, ref_count=%d", l_ref_count, ref_count());
232 }
233
234 inline jint ObjectMonitor::ref_count() const {
235 return _ref_count;
236 }
237
238 #endif // SHARE_RUNTIME_OBJECTMONITOR_INLINE_HPP
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51 inline jint ObjectMonitor::waiters() const {
52 return _waiters;
53 }
54
55 // Returns NULL if DEFLATER_MARKER is observed.
56 inline void* ObjectMonitor::owner() const {
57 void* owner = _owner;
58 return owner != DEFLATER_MARKER ? owner : NULL;
59 }
60
61 // Returns true if owner field == DEFLATER_MARKER and false otherwise.
62 // This accessor is called when we really need to know if the owner
63 // field == DEFLATER_MARKER and any non-NULL value won't do the trick.
64 inline bool ObjectMonitor::owner_is_DEFLATER_MARKER() {
65 return _owner == DEFLATER_MARKER;
66 }
67
68 inline void ObjectMonitor::clear() {
69 assert(Atomic::load(&_header).value() != 0, "must be non-zero");
70 assert(_owner == NULL, "must be NULL: owner=" INTPTR_FORMAT, p2i(_owner));
71 #ifdef ASSERT
72 jint l_ref_count = ref_count();
73 #endif
74 assert(l_ref_count == 0, "must be 0: l_ref_count=%d, ref_count=%d", l_ref_count, ref_count());
75
76 Atomic::store(&_header, markWord::zero());
77
78 clear_using_JT();
79 }
80
81 inline void ObjectMonitor::clear_using_JT() {
82 // Unlike other *_using_JT() functions, we cannot assert
83 // AsyncDeflateIdleMonitors or Thread::current()->is_Java_thread()
84 // because clear() calls this function for the rest of its checks.
85
86 if (AsyncDeflateIdleMonitors) {
87 // Async deflation protocol uses the header, owner and ref_count
88 // fields. While the ObjectMonitor being deflated is on the global free
89 // list, we leave those three fields alone; owner == DEFLATER_MARKER
90 // and ref_count < 0 will force any racing threads to retry. The
91 // header field is used by install_displaced_markword_in_object()
92 // in the last part of the deflation protocol so we cannot check
93 // its value here.
106 _object = NULL;
107 }
108
109 inline void* ObjectMonitor::object() const {
110 return _object;
111 }
112
113 inline void* ObjectMonitor::object_addr() {
114 return (void *)(&_object);
115 }
116
117 inline void ObjectMonitor::set_object(void* obj) {
118 _object = obj;
119 }
120
121 // return number of threads contending for this monitor
122 inline jint ObjectMonitor::contentions() const {
123 return _contentions;
124 }
125
126 // Clear _owner field; current value must match old_value.
127 // If needs_fence is true, we issue a fence() after the release_store().
128 // Otherwise, a storeload() is good enough. See the callers for more info.
129 inline void ObjectMonitor::release_clear_owner_with_barrier(void* old_value,
130 bool needs_fence) {
131 void* prev = _owner;
132 ADIM_guarantee(prev == old_value, "unexpected prev owner=" INTPTR_FORMAT
133 ", expected=" INTPTR_FORMAT, p2i(prev), p2i(old_value));
134 Atomic::release_store(&_owner, (void*)NULL);
135 if (needs_fence) {
136 OrderAccess::fence();
137 } else {
138 OrderAccess::storeload();
139 }
140 log_trace(monitorinflation, owner)("release_clear_owner_with_barrier(): mid="
141 INTPTR_FORMAT ", prev=" INTPTR_FORMAT
142 ", needs_fence=%d", p2i(this), p2i(prev),
143 needs_fence);
144 }
145
146 // Simply set _owner field to new_value; current value must match old_value.
147 // (Simple means no memory sync needed.)
148 inline void ObjectMonitor::simply_set_owner_from(void* new_value, void* old_value) {
149 void* prev = _owner;
150 ADIM_guarantee(prev == old_value, "unexpected prev owner=" INTPTR_FORMAT
151 ", expected=" INTPTR_FORMAT, p2i(prev), p2i(old_value));
152 _owner = new_value;
153 log_trace(monitorinflation, owner)("simply_set_owner_from(): mid="
154 INTPTR_FORMAT ", prev=" INTPTR_FORMAT
155 ", new=" INTPTR_FORMAT, p2i(this),
156 p2i(prev), p2i(new_value));
157 }
158
159 // Simply set _owner field to new_value; current value must match old_value1 or old_value2.
160 // (Simple means no memory sync needed.)
161 inline void ObjectMonitor::simply_set_owner_from(void* new_value, void* old_value1, void* old_value2) {
162 void* prev = _owner;
163 ADIM_guarantee(prev == old_value1 || prev == old_value2,
205 _allocation_state = s;
206 }
207
208 inline ObjectMonitor::AllocationState ObjectMonitor::allocation_state() const {
209 return _allocation_state;
210 }
211
212 inline bool ObjectMonitor::is_free() const {
213 return _allocation_state == Free;
214 }
215
216 inline bool ObjectMonitor::is_old() const {
217 return _allocation_state == Old;
218 }
219
220 inline bool ObjectMonitor::is_new() const {
221 return _allocation_state == New;
222 }
223
224 inline void ObjectMonitor::dec_ref_count() {
225 Atomic::dec(&_ref_count);
226 // Can be negative as part of async deflation protocol.
227 jint l_ref_count = ref_count();
228 ADIM_guarantee(AsyncDeflateIdleMonitors || l_ref_count >= 0,
229 "sanity check: l_ref_count=%d, ref_count=%d", l_ref_count, ref_count());
230 }
231
232 inline void ObjectMonitor::inc_ref_count() {
233 Atomic::inc(&_ref_count);
234 // Can be negative as part of async deflation protocol.
235 jint l_ref_count = ref_count();
236 ADIM_guarantee(AsyncDeflateIdleMonitors || l_ref_count > 0,
237 "sanity check: l_ref_count=%d, ref_count=%d", l_ref_count, ref_count());
238 }
239
240 inline jint ObjectMonitor::ref_count() const {
241 return Atomic::load(&_ref_count);
242 }
243
244 #endif // SHARE_RUNTIME_OBJECTMONITOR_INLINE_HPP
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