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_SYNCHRONIZER_HPP
26 #define SHARE_RUNTIME_SYNCHRONIZER_HPP
27
28 #include "memory/padded.hpp"
29 #include "oops/markOop.hpp"
30 #include "runtime/basicLock.hpp"
31 #include "runtime/handles.hpp"
32 #include "runtime/perfData.hpp"
33
34 class ObjectMonitor;
35 class ThreadsList;
36
37 struct DeflateMonitorCounters {
38 int nInuse; // currently associated with objects
39 int nInCirculation; // extant
40 int nScavenged; // reclaimed (global and per-thread)
41 int perThreadScavenged; // per-thread scavenge total
42 double perThreadTimes; // per-thread scavenge times
43 };
44
45 class ObjectSynchronizer : AllStatic {
46 friend class VMStructs;
47 public:
48 typedef enum {
49 owner_self,
50 owner_none,
51 owner_other
52 } LockOwnership;
53
54 typedef enum {
90 // Handle all interpreter, compiler and jni cases
91 static int wait(Handle obj, jlong millis, TRAPS);
92 static void notify(Handle obj, TRAPS);
93 static void notifyall(Handle obj, TRAPS);
94
95 static bool quick_notify(oopDesc* obj, Thread* Self, bool All);
96 static bool quick_enter(oop obj, Thread* Self, BasicLock* Lock);
97
98 // Special internal-use-only method for use by JVM infrastructure
99 // that needs to wait() on a java-level object but that can't risk
100 // throwing unexpected InterruptedExecutionExceptions.
101 static void waitUninterruptibly(Handle obj, jlong Millis, Thread * THREAD);
102
103 // used by classloading to free classloader object lock,
104 // wait on an internal lock, and reclaim original lock
105 // with original recursion count
106 static intptr_t complete_exit(Handle obj, TRAPS);
107 static void reenter (Handle obj, intptr_t recursion, TRAPS);
108
109 // thread-specific and global objectMonitor free list accessors
110 static ObjectMonitor * omAlloc(Thread * Self);
111 static void omRelease(Thread * Self, ObjectMonitor * m,
112 bool FromPerThreadAlloc);
113 static void omFlush(Thread * Self);
114
115 // Inflate light weight monitor to heavy weight monitor
116 static ObjectMonitor* inflate(Thread * Self, oop obj, const InflateCause cause);
117 // This version is only for internal use
118 static void inflate_helper(oop obj);
119 static const char* inflate_cause_name(const InflateCause cause);
120
121 // Returns the identity hash value for an oop
122 // NOTE: It may cause monitor inflation
123 static intptr_t identity_hash_value_for(Handle obj);
124 static intptr_t FastHashCode(Thread * Self, oop obj);
125
126 // java.lang.Thread support
127 static bool current_thread_holds_lock(JavaThread* thread, Handle h_obj);
128 static LockOwnership query_lock_ownership(JavaThread * self, Handle h_obj);
129
130 static JavaThread* get_lock_owner(ThreadsList * t_list, Handle h_obj);
131
132 // JNI detach support
133 static void release_monitors_owned_by_thread(TRAPS);
134 static void monitors_iterate(MonitorClosure* m);
135
136 // GC: we current use aggressive monitor deflation policy
137 // Basically we deflate all monitors that are not busy.
138 // An adaptive profile-based deflation policy could be used if needed
139 static void deflate_idle_monitors(DeflateMonitorCounters* counters);
140 static void deflate_thread_local_monitors(Thread* thread, DeflateMonitorCounters* counters);
141 static void prepare_deflate_idle_monitors(DeflateMonitorCounters* counters);
142 static void finish_deflate_idle_monitors(DeflateMonitorCounters* counters);
143
144 // For a given monitor list: global or per-thread, deflate idle monitors
145 static int deflate_monitor_list(ObjectMonitor** listheadp,
146 ObjectMonitor** freeHeadp,
147 ObjectMonitor** freeTailp);
148 static bool deflate_monitor(ObjectMonitor* mid, oop obj,
149 ObjectMonitor** freeHeadp,
150 ObjectMonitor** freeTailp);
151 static bool is_cleanup_needed();
152 static void oops_do(OopClosure* f);
153 // Process oops in thread local used monitors
154 static void thread_local_used_oops_do(Thread* thread, OopClosure* f);
155
156 // debugging
157 static void audit_and_print_stats(bool on_exit);
158 static void chk_free_entry(JavaThread * jt, ObjectMonitor * n,
159 outputStream * out, int *error_cnt_p);
160 static void chk_global_free_list_and_count(outputStream * out,
161 int *error_cnt_p);
162 static void chk_global_in_use_list_and_count(outputStream * out,
163 int *error_cnt_p);
164 static void chk_in_use_entry(JavaThread * jt, ObjectMonitor * n,
165 outputStream * out, int *error_cnt_p);
166 static void chk_per_thread_in_use_list_and_count(JavaThread *jt,
167 outputStream * out,
168 int *error_cnt_p);
169 static void chk_per_thread_free_list_and_count(JavaThread *jt,
170 outputStream * out,
171 int *error_cnt_p);
172 static void log_in_use_monitor_details(outputStream * out, bool on_exit);
173 static int log_monitor_list_counts(outputStream * out);
174 static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0;
175
176 private:
177 friend class SynchronizerTest;
178
179 enum { _BLOCKSIZE = 128 };
180 // global list of blocks of monitors
181 static PaddedEnd<ObjectMonitor> * volatile gBlockList;
182 // global monitor free list
183 static ObjectMonitor * volatile gFreeList;
184 // global monitor in-use list, for moribund threads,
185 // monitors they inflated need to be scanned for deflation
186 static ObjectMonitor * volatile gOmInUseList;
187 // count of entries in gOmInUseList
188 static int gOmInUseCount;
189
190 // Process oops in all global used monitors (i.e. moribund thread's monitors)
191 static void global_used_oops_do(OopClosure* f);
192 // Process oops in monitors on the given list
193 static void list_oops_do(ObjectMonitor* list, OopClosure* f);
194
195 // Support for SynchronizerTest access to GVars fields:
196 static u_char* get_gvars_addr();
197 static u_char* get_gvars_hcSequence_addr();
198 static size_t get_gvars_size();
199 static u_char* get_gvars_stwRandom_addr();
200 };
201
202 // ObjectLocker enforces balanced locking and can never throw an
203 // IllegalMonitorStateException. However, a pending exception may
204 // have to pass through, and we must also be able to deal with
205 // asynchronous exceptions. The caller is responsible for checking
206 // the thread's pending exception if needed.
207 class ObjectLocker : public StackObj {
208 private:
|
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_SYNCHRONIZER_HPP
26 #define SHARE_RUNTIME_SYNCHRONIZER_HPP
27
28 #include "memory/padded.hpp"
29 #include "oops/markOop.hpp"
30 #include "runtime/basicLock.hpp"
31 #include "runtime/handles.hpp"
32 #include "runtime/perfData.hpp"
33
34 class ObjectMonitor;
35 class ObjectMonitorHandle;
36 class ThreadsList;
37
38 struct DeflateMonitorCounters {
39 int nInuse; // currently associated with objects
40 int nInCirculation; // extant
41 int nScavenged; // reclaimed (global and per-thread)
42 int perThreadScavenged; // per-thread scavenge total
43 double perThreadTimes; // per-thread scavenge times
44 };
45
46 class ObjectSynchronizer : AllStatic {
47 friend class VMStructs;
48 public:
49 typedef enum {
50 owner_self,
51 owner_none,
52 owner_other
53 } LockOwnership;
54
55 typedef enum {
91 // Handle all interpreter, compiler and jni cases
92 static int wait(Handle obj, jlong millis, TRAPS);
93 static void notify(Handle obj, TRAPS);
94 static void notifyall(Handle obj, TRAPS);
95
96 static bool quick_notify(oopDesc* obj, Thread* Self, bool All);
97 static bool quick_enter(oop obj, Thread* Self, BasicLock* Lock);
98
99 // Special internal-use-only method for use by JVM infrastructure
100 // that needs to wait() on a java-level object but that can't risk
101 // throwing unexpected InterruptedExecutionExceptions.
102 static void waitUninterruptibly(Handle obj, jlong Millis, Thread * THREAD);
103
104 // used by classloading to free classloader object lock,
105 // wait on an internal lock, and reclaim original lock
106 // with original recursion count
107 static intptr_t complete_exit(Handle obj, TRAPS);
108 static void reenter (Handle obj, intptr_t recursion, TRAPS);
109
110 // thread-specific and global objectMonitor free list accessors
111 static ObjectMonitor * omAlloc(Thread * Self, const InflateCause cause);
112 static void omRelease(Thread * Self, ObjectMonitor * m,
113 bool FromPerThreadAlloc);
114 static void omFlush(Thread * Self);
115
116 // Inflate light weight monitor to heavy weight monitor
117 static void inflate(ObjectMonitorHandle * omh_p, Thread * Self, oop obj,
118 const InflateCause cause);
119 // This version is only for internal use
120 static void inflate_helper(ObjectMonitorHandle * omh_p, oop obj);
121 static const char* inflate_cause_name(const InflateCause cause);
122
123 // Returns the identity hash value for an oop
124 // NOTE: It may cause monitor inflation
125 static intptr_t identity_hash_value_for(Handle obj);
126 static intptr_t FastHashCode(Thread * Self, oop obj);
127
128 // java.lang.Thread support
129 static bool current_thread_holds_lock(JavaThread* thread, Handle h_obj);
130 static LockOwnership query_lock_ownership(JavaThread * self, Handle h_obj);
131
132 static JavaThread* get_lock_owner(ThreadsList * t_list, Handle h_obj);
133
134 // JNI detach support
135 static void release_monitors_owned_by_thread(TRAPS);
136 static void monitors_iterate(MonitorClosure* m);
137
138 // GC: we current use aggressive monitor deflation policy
139 // Basically we deflate all monitors that are not busy.
140 // An adaptive profile-based deflation policy could be used if needed
141 static void deflate_idle_monitors(DeflateMonitorCounters* counters);
142 static void deflate_global_idle_monitors_using_JT();
143 static void deflate_per_thread_idle_monitors_using_JT();
144 static void deflate_common_idle_monitors_using_JT(bool is_global, JavaThread * self);
145 static void deflate_thread_local_monitors(Thread* thread, DeflateMonitorCounters* counters);
146 static void prepare_deflate_idle_monitors(DeflateMonitorCounters* counters);
147 static void finish_deflate_idle_monitors(DeflateMonitorCounters* counters);
148
149 // For a given monitor list: global or per-thread, deflate idle monitors
150 static int deflate_monitor_list(ObjectMonitor** listheadp,
151 ObjectMonitor** freeHeadp,
152 ObjectMonitor** freeTailp);
153 // For a given in-use monitor list: global or per-thread, deflate idle
154 // monitors using a JavaThread.
155 static int deflate_monitor_list_using_JT(ObjectMonitor** listHeadp,
156 ObjectMonitor** freeHeadp,
157 ObjectMonitor** freeTailp,
158 ObjectMonitor** savedMidInUsep);
159 static bool deflate_monitor(ObjectMonitor* mid, oop obj,
160 ObjectMonitor** freeHeadp,
161 ObjectMonitor** freeTailp);
162 static bool deflate_monitor_using_JT(ObjectMonitor* mid,
163 ObjectMonitor** freeHeadp,
164 ObjectMonitor** freeTailp);
165 static bool is_async_deflation_needed();
166 static bool is_safepoint_deflation_needed();
167 static bool is_async_deflation_requested() { return _is_async_deflation_requested; }
168 static bool is_special_deflation_requested() { return _is_special_deflation_requested; }
169 static void set_is_async_deflation_requested(bool new_value) { _is_async_deflation_requested = new_value; }
170 static void set_is_special_deflation_requested(bool new_value) { _is_special_deflation_requested = new_value; }
171 static jlong time_since_last_async_deflation_ms();
172 static void oops_do(OopClosure* f);
173 // Process oops in thread local used monitors
174 static void thread_local_used_oops_do(Thread* thread, OopClosure* f);
175
176 // debugging
177 static void audit_and_print_stats(bool on_exit);
178 static void chk_free_entry(JavaThread * jt, ObjectMonitor * n,
179 outputStream * out, int *error_cnt_p);
180 static void chk_global_free_list_and_count(outputStream * out,
181 int *error_cnt_p);
182 static void chk_global_in_use_list_and_count(outputStream * out,
183 int *error_cnt_p);
184 static void chk_in_use_entry(JavaThread * jt, ObjectMonitor * n,
185 outputStream * out, int *error_cnt_p);
186 static void chk_per_thread_in_use_list_and_count(JavaThread *jt,
187 outputStream * out,
188 int *error_cnt_p);
189 static void chk_per_thread_free_list_and_count(JavaThread *jt,
190 outputStream * out,
191 int *error_cnt_p);
192 static void log_in_use_monitor_details(outputStream * out, bool on_exit);
193 static int log_monitor_list_counts(outputStream * out);
194 static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0;
195
196 static void do_safepoint_work(DeflateMonitorCounters* _counters);
197
198 private:
199 friend class SynchronizerTest;
200
201 enum { _BLOCKSIZE = 128 };
202 // global list of blocks of monitors
203 static PaddedEnd<ObjectMonitor> * volatile gBlockList;
204 // global monitor free list
205 static ObjectMonitor * volatile gFreeList;
206 // global monitor in-use list, for moribund threads,
207 // monitors they inflated need to be scanned for deflation
208 static ObjectMonitor * volatile gOmInUseList;
209 // count of entries in gOmInUseList
210 static int gOmInUseCount;
211 static volatile bool _is_async_deflation_requested;
212 static volatile bool _is_special_deflation_requested;
213 static jlong _last_async_deflation_time_ns;
214
215 // Process oops in all global used monitors (i.e. moribund thread's monitors)
216 static void global_used_oops_do(OopClosure* f);
217 // Process oops in monitors on the given list
218 static void list_oops_do(ObjectMonitor* list, OopClosure* f);
219
220 // Support for SynchronizerTest access to GVars fields:
221 static u_char* get_gvars_addr();
222 static u_char* get_gvars_hcSequence_addr();
223 static size_t get_gvars_size();
224 static u_char* get_gvars_stwRandom_addr();
225 };
226
227 // ObjectLocker enforces balanced locking and can never throw an
228 // IllegalMonitorStateException. However, a pending exception may
229 // have to pass through, and we must also be able to deal with
230 // asynchronous exceptions. The caller is responsible for checking
231 // the thread's pending exception if needed.
232 class ObjectLocker : public StackObj {
233 private:
|