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_VM_RUNTIME_SYNCHRONIZER_HPP
26 #define SHARE_VM_RUNTIME_SYNCHRONIZER_HPP
27
28 #include "oops/markOop.hpp"
29 #include "runtime/basicLock.hpp"
30 #include "runtime/handles.hpp"
31 #include "runtime/perfData.hpp"
32
33 class ObjectMonitor;
34
35 class ObjectSynchronizer : AllStatic {
36 friend class VMStructs;
37 public:
38 typedef enum {
39 owner_self,
40 owner_none,
41 owner_other
42 } LockOwnership;
43
44 typedef enum {
45 inflate_cause_vm_internal = 0,
46 inflate_cause_monitor_enter = 1,
47 inflate_cause_wait = 2,
48 inflate_cause_notify = 3,
49 inflate_cause_hash_code = 4,
50 inflate_cause_jni_enter = 5,
51 inflate_cause_jni_exit = 6,
52 inflate_cause_nof = 7 // Number of causes
53 } InflateCause;
54
110 static const char* inflate_cause_name(const InflateCause cause);
111
112 // Returns the identity hash value for an oop
113 // NOTE: It may cause monitor inflation
114 static intptr_t identity_hash_value_for(Handle obj);
115 static intptr_t FastHashCode(Thread * Self, oop obj);
116
117 // java.lang.Thread support
118 static bool current_thread_holds_lock(JavaThread* thread, Handle h_obj);
119 static LockOwnership query_lock_ownership(JavaThread * self, Handle h_obj);
120
121 static JavaThread* get_lock_owner(Handle h_obj, bool doLock);
122
123 // JNI detach support
124 static void release_monitors_owned_by_thread(TRAPS);
125 static void monitors_iterate(MonitorClosure* m);
126
127 // GC: we current use aggressive monitor deflation policy
128 // Basically we deflate all monitors that are not busy.
129 // An adaptive profile-based deflation policy could be used if needed
130 static void deflate_idle_monitors();
131 // For a given monitor list: global or per-thread, deflate idle monitors
132 static int deflate_monitor_list(ObjectMonitor** listheadp,
133 ObjectMonitor** freeHeadp,
134 ObjectMonitor** freeTailp);
135 static bool deflate_monitor(ObjectMonitor* mid, oop obj,
136 ObjectMonitor** freeHeadp,
137 ObjectMonitor** freeTailp);
138 static bool is_cleanup_needed();
139 static void oops_do(OopClosure* f);
140 // Process oops in thread local used monitors
141 static void thread_local_used_oops_do(Thread* thread, OopClosure* f);
142
143 // debugging
144 static void sanity_checks(const bool verbose,
145 const unsigned int cache_line_size,
146 int *error_cnt_ptr, int *warning_cnt_ptr);
147 static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0;
148
149 private:
150 enum { _BLOCKSIZE = 128 };
|
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_VM_RUNTIME_SYNCHRONIZER_HPP
26 #define SHARE_VM_RUNTIME_SYNCHRONIZER_HPP
27
28 #include "oops/markOop.hpp"
29 #include "runtime/basicLock.hpp"
30 #include "runtime/handles.hpp"
31 #include "runtime/perfData.hpp"
32
33 class ObjectMonitor;
34
35 struct DeflateMonitorCounters {
36 int nInuse; // currently associated with objects
37 int nInCirculation; // extant
38 int nScavenged; // reclaimed
39 };
40
41 class ObjectSynchronizer : AllStatic {
42 friend class VMStructs;
43 public:
44 typedef enum {
45 owner_self,
46 owner_none,
47 owner_other
48 } LockOwnership;
49
50 typedef enum {
51 inflate_cause_vm_internal = 0,
52 inflate_cause_monitor_enter = 1,
53 inflate_cause_wait = 2,
54 inflate_cause_notify = 3,
55 inflate_cause_hash_code = 4,
56 inflate_cause_jni_enter = 5,
57 inflate_cause_jni_exit = 6,
58 inflate_cause_nof = 7 // Number of causes
59 } InflateCause;
60
116 static const char* inflate_cause_name(const InflateCause cause);
117
118 // Returns the identity hash value for an oop
119 // NOTE: It may cause monitor inflation
120 static intptr_t identity_hash_value_for(Handle obj);
121 static intptr_t FastHashCode(Thread * Self, oop obj);
122
123 // java.lang.Thread support
124 static bool current_thread_holds_lock(JavaThread* thread, Handle h_obj);
125 static LockOwnership query_lock_ownership(JavaThread * self, Handle h_obj);
126
127 static JavaThread* get_lock_owner(Handle h_obj, bool doLock);
128
129 // JNI detach support
130 static void release_monitors_owned_by_thread(TRAPS);
131 static void monitors_iterate(MonitorClosure* m);
132
133 // GC: we current use aggressive monitor deflation policy
134 // Basically we deflate all monitors that are not busy.
135 // An adaptive profile-based deflation policy could be used if needed
136 static void deflate_idle_monitors(DeflateMonitorCounters* counters);
137 static void deflate_thread_local_monitors(Thread* thread, DeflateMonitorCounters* counters);
138 static void prepare_deflate_idle_monitors(DeflateMonitorCounters* counters);
139 static void finish_deflate_idle_monitors(DeflateMonitorCounters* counters);
140
141 // For a given monitor list: global or per-thread, deflate idle monitors
142 static int deflate_monitor_list(ObjectMonitor** listheadp,
143 ObjectMonitor** freeHeadp,
144 ObjectMonitor** freeTailp);
145 static bool deflate_monitor(ObjectMonitor* mid, oop obj,
146 ObjectMonitor** freeHeadp,
147 ObjectMonitor** freeTailp);
148 static bool is_cleanup_needed();
149 static void oops_do(OopClosure* f);
150 // Process oops in thread local used monitors
151 static void thread_local_used_oops_do(Thread* thread, OopClosure* f);
152
153 // debugging
154 static void sanity_checks(const bool verbose,
155 const unsigned int cache_line_size,
156 int *error_cnt_ptr, int *warning_cnt_ptr);
157 static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0;
158
159 private:
160 enum { _BLOCKSIZE = 128 };
|