1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/vm/runtime/basicLock.hpp Fri Oct 22 15:59:34 2010 -0400
1.3 @@ -0,0 +1,72 @@
1.4 +/*
1.5 + * Copyright (c) 1998, 2007, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation.
1.11 + *
1.12 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.13 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.14 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.15 + * version 2 for more details (a copy is included in the LICENSE file that
1.16 + * accompanied this code).
1.17 + *
1.18 + * You should have received a copy of the GNU General Public License version
1.19 + * 2 along with this work; if not, write to the Free Software Foundation,
1.20 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.21 + *
1.22 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.23 + * or visit www.oracle.com if you need additional information or have any
1.24 + * questions.
1.25 + *
1.26 + */
1.27 +
1.28 +class BasicLock VALUE_OBJ_CLASS_SPEC {
1.29 + friend class VMStructs;
1.30 + private:
1.31 + volatile markOop _displaced_header;
1.32 + public:
1.33 + markOop displaced_header() const { return _displaced_header; }
1.34 + void set_displaced_header(markOop header) { _displaced_header = header; }
1.35 +
1.36 + void print_on(outputStream* st) const;
1.37 +
1.38 + // move a basic lock (used during deoptimization
1.39 + void move_to(oop obj, BasicLock* dest);
1.40 +
1.41 + static int displaced_header_offset_in_bytes() { return offset_of(BasicLock, _displaced_header); }
1.42 +};
1.43 +
1.44 +// A BasicObjectLock associates a specific Java object with a BasicLock.
1.45 +// It is currently embedded in an interpreter frame.
1.46 +
1.47 +// Because some machines have alignment restrictions on the control stack,
1.48 +// the actual space allocated by the interpreter may include padding words
1.49 +// after the end of the BasicObjectLock. Also, in order to guarantee
1.50 +// alignment of the embedded BasicLock objects on such machines, we
1.51 +// put the embedded BasicLock at the beginning of the struct.
1.52 +
1.53 +class BasicObjectLock VALUE_OBJ_CLASS_SPEC {
1.54 + friend class VMStructs;
1.55 + private:
1.56 + BasicLock _lock; // the lock, must be double word aligned
1.57 + oop _obj; // object holds the lock;
1.58 +
1.59 + public:
1.60 + // Manipulation
1.61 + oop obj() const { return _obj; }
1.62 + void set_obj(oop obj) { _obj = obj; }
1.63 + BasicLock* lock() { return &_lock; }
1.64 +
1.65 + // Note: Use frame::interpreter_frame_monitor_size() for the size of BasicObjectLocks
1.66 + // in interpreter activation frames since it includes machine-specific padding.
1.67 + static int size() { return sizeof(BasicObjectLock)/wordSize; }
1.68 +
1.69 + // GC support
1.70 + void oops_do(OopClosure* f) { f->do_oop(&_obj); }
1.71 +
1.72 + static int obj_offset_in_bytes() { return offset_of(BasicObjectLock, _obj); }
1.73 + static int lock_offset_in_bytes() { return offset_of(BasicObjectLock, _lock); }
1.74 +};
1.75 +
