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comparison src/share/vm/runtime/basicLock.hpp @ 1878:fa83ab460c54

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6988353: refactor contended sync subsystem Summary: reduce complexity by factoring synchronizer.cpp Reviewed-by: dholmes, never, coleenp
author acorn
date Fri, 22 Oct 2010 15:59:34 -0400
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children f95d63e2154a
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1874:75ab0162aa84 1878:fa83ab460c54
1 /*
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.
4 *
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
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
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 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