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 *
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,
107 static ObjectMonitor * omAlloc(Thread * Self);
108 static void omRelease(Thread * Self, ObjectMonitor * m,
109 bool FromPerThreadAlloc);
110 static void omFlush(Thread * Self);
111
112 // Inflate light weight monitor to heavy weight monitor
113 static ObjectMonitor* inflate(Thread * Self, oop obj, const InflateCause cause);
114 // This version is only for internal use
115 static ObjectMonitor* inflate_helper(oop obj);
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);
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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 *
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 class ThreadsList;
35
36 struct DeflateMonitorCounters {
37 int nInuse; // currently associated with objects
38 int nInCirculation; // extant
39 int nScavenged; // reclaimed
40 };
41
42 class ObjectSynchronizer : AllStatic {
43 friend class VMStructs;
44 public:
45 typedef enum {
46 owner_self,
47 owner_none,
48 owner_other
49 } LockOwnership;
50
51 typedef enum {
52 inflate_cause_vm_internal = 0,
53 inflate_cause_monitor_enter = 1,
54 inflate_cause_wait = 2,
108 static ObjectMonitor * omAlloc(Thread * Self);
109 static void omRelease(Thread * Self, ObjectMonitor * m,
110 bool FromPerThreadAlloc);
111 static void omFlush(Thread * Self);
112
113 // Inflate light weight monitor to heavy weight monitor
114 static ObjectMonitor* inflate(Thread * Self, oop obj, const InflateCause cause);
115 // This version is only for internal use
116 static ObjectMonitor* inflate_helper(oop obj);
117 static const char* inflate_cause_name(const InflateCause cause);
118
119 // Returns the identity hash value for an oop
120 // NOTE: It may cause monitor inflation
121 static intptr_t identity_hash_value_for(Handle obj);
122 static intptr_t FastHashCode(Thread * Self, oop obj);
123
124 // java.lang.Thread support
125 static bool current_thread_holds_lock(JavaThread* thread, Handle h_obj);
126 static LockOwnership query_lock_ownership(JavaThread * self, Handle h_obj);
127
128 static JavaThread* get_lock_owner(ThreadsList * t_list, Handle h_obj);
129
130 // JNI detach support
131 static void release_monitors_owned_by_thread(TRAPS);
132 static void monitors_iterate(MonitorClosure* m);
133
134 // GC: we current use aggressive monitor deflation policy
135 // Basically we deflate all monitors that are not busy.
136 // An adaptive profile-based deflation policy could be used if needed
137 static void deflate_idle_monitors(DeflateMonitorCounters* counters);
138 static void deflate_thread_local_monitors(Thread* thread, DeflateMonitorCounters* counters);
139 static void prepare_deflate_idle_monitors(DeflateMonitorCounters* counters);
140 static void finish_deflate_idle_monitors(DeflateMonitorCounters* counters);
141
142 // For a given monitor list: global or per-thread, deflate idle monitors
143 static int deflate_monitor_list(ObjectMonitor** listheadp,
144 ObjectMonitor** freeHeadp,
145 ObjectMonitor** freeTailp);
146 static bool deflate_monitor(ObjectMonitor* mid, oop obj,
147 ObjectMonitor** freeHeadp,
148 ObjectMonitor** freeTailp);
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