annotate src/share/vm/utilities/accessFlags.cpp @ 453:c96030fff130

6684579: SoftReference processing can be made more efficient Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not. Reviewed-by: jmasa
author ysr
date Thu, 20 Nov 2008 16:56:09 -0800
parents a61af66fc99e
children c18cbe5936b8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
a61af66fc99e Initial load
duke
parents:
diff changeset
1 /*
a61af66fc99e Initial load
duke
parents:
diff changeset
2 * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved.
a61af66fc99e Initial load
duke
parents:
diff changeset
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
a61af66fc99e Initial load
duke
parents:
diff changeset
4 *
a61af66fc99e Initial load
duke
parents:
diff changeset
5 * This code is free software; you can redistribute it and/or modify it
a61af66fc99e Initial load
duke
parents:
diff changeset
6 * under the terms of the GNU General Public License version 2 only, as
a61af66fc99e Initial load
duke
parents:
diff changeset
7 * published by the Free Software Foundation.
a61af66fc99e Initial load
duke
parents:
diff changeset
8 *
a61af66fc99e Initial load
duke
parents:
diff changeset
9 * This code is distributed in the hope that it will be useful, but WITHOUT
a61af66fc99e Initial load
duke
parents:
diff changeset
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
a61af66fc99e Initial load
duke
parents:
diff changeset
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
a61af66fc99e Initial load
duke
parents:
diff changeset
12 * version 2 for more details (a copy is included in the LICENSE file that
a61af66fc99e Initial load
duke
parents:
diff changeset
13 * accompanied this code).
a61af66fc99e Initial load
duke
parents:
diff changeset
14 *
a61af66fc99e Initial load
duke
parents:
diff changeset
15 * You should have received a copy of the GNU General Public License version
a61af66fc99e Initial load
duke
parents:
diff changeset
16 * 2 along with this work; if not, write to the Free Software Foundation,
a61af66fc99e Initial load
duke
parents:
diff changeset
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
a61af66fc99e Initial load
duke
parents:
diff changeset
18 *
a61af66fc99e Initial load
duke
parents:
diff changeset
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
a61af66fc99e Initial load
duke
parents:
diff changeset
20 * CA 95054 USA or visit www.sun.com if you need additional information or
a61af66fc99e Initial load
duke
parents:
diff changeset
21 * have any questions.
a61af66fc99e Initial load
duke
parents:
diff changeset
22 *
a61af66fc99e Initial load
duke
parents:
diff changeset
23 */
a61af66fc99e Initial load
duke
parents:
diff changeset
24
a61af66fc99e Initial load
duke
parents:
diff changeset
25 # include "incls/_precompiled.incl"
a61af66fc99e Initial load
duke
parents:
diff changeset
26 # include "incls/_accessFlags.cpp.incl"
a61af66fc99e Initial load
duke
parents:
diff changeset
27
a61af66fc99e Initial load
duke
parents:
diff changeset
28
a61af66fc99e Initial load
duke
parents:
diff changeset
29 void AccessFlags::atomic_set_bits(jint bits) {
a61af66fc99e Initial load
duke
parents:
diff changeset
30 // Atomically update the flags with the bits given
a61af66fc99e Initial load
duke
parents:
diff changeset
31 jint old_flags, new_flags, f;
a61af66fc99e Initial load
duke
parents:
diff changeset
32 do {
a61af66fc99e Initial load
duke
parents:
diff changeset
33 old_flags = _flags;
a61af66fc99e Initial load
duke
parents:
diff changeset
34 new_flags = old_flags | bits;
a61af66fc99e Initial load
duke
parents:
diff changeset
35 f = Atomic::cmpxchg(new_flags, &_flags, old_flags);
a61af66fc99e Initial load
duke
parents:
diff changeset
36 } while(f != old_flags);
a61af66fc99e Initial load
duke
parents:
diff changeset
37 }
a61af66fc99e Initial load
duke
parents:
diff changeset
38
a61af66fc99e Initial load
duke
parents:
diff changeset
39 void AccessFlags::atomic_clear_bits(jint bits) {
a61af66fc99e Initial load
duke
parents:
diff changeset
40 // Atomically update the flags with the bits given
a61af66fc99e Initial load
duke
parents:
diff changeset
41 jint old_flags, new_flags, f;
a61af66fc99e Initial load
duke
parents:
diff changeset
42 do {
a61af66fc99e Initial load
duke
parents:
diff changeset
43 old_flags = _flags;
a61af66fc99e Initial load
duke
parents:
diff changeset
44 new_flags = old_flags & ~bits;
a61af66fc99e Initial load
duke
parents:
diff changeset
45 f = Atomic::cmpxchg(new_flags, &_flags, old_flags);
a61af66fc99e Initial load
duke
parents:
diff changeset
46 } while(f != old_flags);
a61af66fc99e Initial load
duke
parents:
diff changeset
47 }
a61af66fc99e Initial load
duke
parents:
diff changeset
48
a61af66fc99e Initial load
duke
parents:
diff changeset
49 #ifndef PRODUCT
a61af66fc99e Initial load
duke
parents:
diff changeset
50
a61af66fc99e Initial load
duke
parents:
diff changeset
51 void AccessFlags::print_on(outputStream* st) const {
a61af66fc99e Initial load
duke
parents:
diff changeset
52 if (is_public ()) st->print("public " );
a61af66fc99e Initial load
duke
parents:
diff changeset
53 if (is_private ()) st->print("private " );
a61af66fc99e Initial load
duke
parents:
diff changeset
54 if (is_protected ()) st->print("protected " );
a61af66fc99e Initial load
duke
parents:
diff changeset
55 if (is_static ()) st->print("static " );
a61af66fc99e Initial load
duke
parents:
diff changeset
56 if (is_final ()) st->print("final " );
a61af66fc99e Initial load
duke
parents:
diff changeset
57 if (is_synchronized()) st->print("synchronized ");
a61af66fc99e Initial load
duke
parents:
diff changeset
58 if (is_volatile ()) st->print("volatile " );
a61af66fc99e Initial load
duke
parents:
diff changeset
59 if (is_transient ()) st->print("transient " );
a61af66fc99e Initial load
duke
parents:
diff changeset
60 if (is_native ()) st->print("native " );
a61af66fc99e Initial load
duke
parents:
diff changeset
61 if (is_interface ()) st->print("interface " );
a61af66fc99e Initial load
duke
parents:
diff changeset
62 if (is_abstract ()) st->print("abstract " );
a61af66fc99e Initial load
duke
parents:
diff changeset
63 if (is_strict ()) st->print("strict " );
a61af66fc99e Initial load
duke
parents:
diff changeset
64 if (is_synthetic ()) st->print("synthetic " );
a61af66fc99e Initial load
duke
parents:
diff changeset
65 if (is_old ()) st->print("{old} " );
a61af66fc99e Initial load
duke
parents:
diff changeset
66 if (is_obsolete ()) st->print("{obsolete} " );
a61af66fc99e Initial load
duke
parents:
diff changeset
67 }
a61af66fc99e Initial load
duke
parents:
diff changeset
68
a61af66fc99e Initial load
duke
parents:
diff changeset
69 #endif
a61af66fc99e Initial load
duke
parents:
diff changeset
70
a61af66fc99e Initial load
duke
parents:
diff changeset
71 void accessFlags_init() {
a61af66fc99e Initial load
duke
parents:
diff changeset
72 assert(sizeof(AccessFlags) == sizeof(jint), "just checking size of flags");
a61af66fc99e Initial load
duke
parents:
diff changeset
73 }