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