1/*
2 * Copyright (c) 2014, 2018, 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#include "precompiled.hpp"
26#include "jvm.h"
27#include "gc/shared/gcId.hpp"
28#include "runtime/safepoint.hpp"
29#include "runtime/thread.inline.hpp"
30
31uint GCId::_next_id = 0;
32
33NamedThread* currentNamedthread() {
34 assert(Thread::current()->is_Named_thread(), "This thread must be NamedThread");
35 return (NamedThread*)Thread::current();
36}
37
38uint GCId::create() {
39 return _next_id++;
40}
41
42uint GCId::peek() {
43 return _next_id;
44}
45
46uint GCId::current() {
47 const uint gc_id = currentNamedthread()->gc_id();
48 assert(gc_id != undefined(), "Using undefined GC id.");
49 return gc_id;
50}
51
52uint GCId::current_or_undefined() {
53 return Thread::current()->is_Named_thread() ? currentNamedthread()->gc_id() : undefined();
54}
55
56size_t GCId::print_prefix(char* buf, size_t len) {
57 Thread* thread = Thread::current_or_null();
58 if (thread != NULL) {
59 uint gc_id = current_or_undefined();
60 if (gc_id != undefined()) {
61 int ret = jio_snprintf(buf, len, "GC(%u) ", gc_id);
62 assert(ret > 0, "Failed to print prefix. Log buffer too small?");
63 return (size_t)ret;
64 }
65 }
66 return 0;
67}
68
69GCIdMark::GCIdMark() : _previous_gc_id(currentNamedthread()->gc_id()) {
70 currentNamedthread()->set_gc_id(GCId::create());
71}
72
73GCIdMark::GCIdMark(uint gc_id) : _previous_gc_id(currentNamedthread()->gc_id()) {
74 currentNamedthread()->set_gc_id(gc_id);
75}
76
77GCIdMark::~GCIdMark() {
78 currentNamedthread()->set_gc_id(_previous_gc_id);
79}
80