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comparison src/share/vm/runtime/synchronizer.hpp @ 1930:2d26b0046e0d

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Merge.
author Thomas Wuerthinger <wuerthinger@ssw.jku.at>
date Tue, 30 Nov 2010 14:53:30 +0100
parents fa83ab460c54
children f95d63e2154a
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1484:6b7001391c97 1930:2d26b0046e0d
1 /* 1 /*
2 * Copyright 1998-2007 Sun Microsystems, Inc. All Rights Reserved. 2 * Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
14 * 14 *
15 * You should have received a copy of the GNU General Public License version 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, 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. 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 * 18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * CA 95054 USA or visit www.sun.com if you need additional information or 20 * or visit www.oracle.com if you need additional information or have any
21 * have any questions. 21 * questions.
22 * 22 *
23 */ 23 */
24 24
25 class BasicLock VALUE_OBJ_CLASS_SPEC {
26 friend class VMStructs;
27 private:
28 volatile markOop _displaced_header;
29 public:
30 markOop displaced_header() const { return _displaced_header; }
31 void set_displaced_header(markOop header) { _displaced_header = header; }
32
33 void print_on(outputStream* st) const;
34
35 // move a basic lock (used during deoptimization
36 void move_to(oop obj, BasicLock* dest);
37
38 static int displaced_header_offset_in_bytes() { return offset_of(BasicLock, _displaced_header); }
39 };
40
41 // A BasicObjectLock associates a specific Java object with a BasicLock.
42 // It is currently embedded in an interpreter frame.
43
44 // Because some machines have alignment restrictions on the control stack,
45 // the actual space allocated by the interpreter may include padding words
46 // after the end of the BasicObjectLock. Also, in order to guarantee
47 // alignment of the embedded BasicLock objects on such machines, we
48 // put the embedded BasicLock at the beginning of the struct.
49
50 class BasicObjectLock VALUE_OBJ_CLASS_SPEC {
51 friend class VMStructs;
52 private:
53 BasicLock _lock; // the lock, must be double word aligned
54 oop _obj; // object holds the lock;
55
56 public:
57 // Manipulation
58 oop obj() const { return _obj; }
59 void set_obj(oop obj) { _obj = obj; }
60 BasicLock* lock() { return &_lock; }
61
62 // Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks
63 // in interpreter activation frames since it includes machine-specific padding.
64 static int size() { return sizeof(BasicObjectLock)/wordSize; }
65
66 // GC support
67 void oops_do(OopClosure* f) { f->do_oop(&_obj); }
68
69 static int obj_offset_in_bytes() { return offset_of(BasicObjectLock, _obj); }
70 static int lock_offset_in_bytes() { return offset_of(BasicObjectLock, _lock); }
71 };
72 25
73 class ObjectMonitor; 26 class ObjectMonitor;
74 27
75 class ObjectSynchronizer : AllStatic { 28 class ObjectSynchronizer : AllStatic {
76 friend class VMStructs; 29 friend class VMStructs;
120 // with original recursion count 73 // with original recursion count
121 static intptr_t complete_exit (Handle obj, TRAPS); 74 static intptr_t complete_exit (Handle obj, TRAPS);
122 static void reenter (Handle obj, intptr_t recursion, TRAPS); 75 static void reenter (Handle obj, intptr_t recursion, TRAPS);
123 76
124 // thread-specific and global objectMonitor free list accessors 77 // thread-specific and global objectMonitor free list accessors
78 // static void verifyInUse (Thread * Self) ; too slow for general assert/debug
125 static ObjectMonitor * omAlloc (Thread * Self) ; 79 static ObjectMonitor * omAlloc (Thread * Self) ;
126 static void omRelease (Thread * Self, ObjectMonitor * m) ; 80 static void omRelease (Thread * Self, ObjectMonitor * m, bool FromPerThreadAlloc) ;
127 static void omFlush (Thread * Self) ; 81 static void omFlush (Thread * Self) ;
128 82
129 // Inflate light weight monitor to heavy weight monitor 83 // Inflate light weight monitor to heavy weight monitor
130 static ObjectMonitor* inflate(Thread * Self, oop obj); 84 static ObjectMonitor* inflate(Thread * Self, oop obj);
131 // This version is only for internal use 85 // This version is only for internal use
148 102
149 // GC: we current use aggressive monitor deflation policy 103 // GC: we current use aggressive monitor deflation policy
150 // Basically we deflate all monitors that are not busy. 104 // Basically we deflate all monitors that are not busy.
151 // An adaptive profile-based deflation policy could be used if needed 105 // An adaptive profile-based deflation policy could be used if needed
152 static void deflate_idle_monitors(); 106 static void deflate_idle_monitors();
107 static int walk_monitor_list(ObjectMonitor** listheadp,
108 ObjectMonitor** FreeHeadp,
109 ObjectMonitor** FreeTailp);
110 static bool deflate_monitor(ObjectMonitor* mid, oop obj, ObjectMonitor** FreeHeadp,
111 ObjectMonitor** FreeTailp);
153 static void oops_do(OopClosure* f); 112 static void oops_do(OopClosure* f);
154 113
155 // debugging 114 // debugging
156 static void trace_locking(Handle obj, bool is_compiled, bool is_method, bool is_locking) PRODUCT_RETURN; 115 static void trace_locking(Handle obj, bool is_compiled, bool is_method, bool is_locking) PRODUCT_RETURN;
157 static void verify() PRODUCT_RETURN; 116 static void verify() PRODUCT_RETURN;
158 static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0; 117 static int verify_objmon_isinpool(ObjectMonitor *addr) PRODUCT_RETURN0;
159 118
119 static void RegisterSpinCallback (int (*)(intptr_t, int), intptr_t) ;
120
160 private: 121 private:
161 enum { _BLOCKSIZE = 128 }; 122 enum { _BLOCKSIZE = 128 };
162 static ObjectMonitor* gBlockList; 123 static ObjectMonitor* gBlockList;
163 static ObjectMonitor * volatile gFreeList; 124 static ObjectMonitor * volatile gFreeList;
164 125 static ObjectMonitor * volatile gOmInUseList; // for moribund thread, so monitors they inflated still get scanned
165 public: 126 static int gOmInUseCount;
166 static void Initialize () ;
167 static PerfCounter * _sync_ContendedLockAttempts ;
168 static PerfCounter * _sync_FutileWakeups ;
169 static PerfCounter * _sync_Parks ;
170 static PerfCounter * _sync_EmptyNotifications ;
171 static PerfCounter * _sync_Notifications ;
172 static PerfCounter * _sync_SlowEnter ;
173 static PerfCounter * _sync_SlowExit ;
174 static PerfCounter * _sync_SlowNotify ;
175 static PerfCounter * _sync_SlowNotifyAll ;
176 static PerfCounter * _sync_FailedSpins ;
177 static PerfCounter * _sync_SuccessfulSpins ;
178 static PerfCounter * _sync_PrivateA ;
179 static PerfCounter * _sync_PrivateB ;
180 static PerfCounter * _sync_MonInCirculation ;
181 static PerfCounter * _sync_MonScavenged ;
182 static PerfCounter * _sync_Inflations ;
183 static PerfCounter * _sync_Deflations ;
184 static PerfLongVariable * _sync_MonExtant ;
185
186 public:
187 static void RegisterSpinCallback (int (*)(intptr_t, int), intptr_t) ;
188 127
189 }; 128 };
190 129
191 // ObjectLocker enforced balanced locking and can never thrown an 130 // ObjectLocker enforced balanced locking and can never thrown an
192 // IllegalMonitorStateException. However, a pending exception may 131 // IllegalMonitorStateException. However, a pending exception may