1/*
2 * Copyright (c) 2014, 2015, 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 "gc/shared/gcId.hpp"
27#include "runtime/safepoint.hpp"
28#include "runtime/thread.inline.hpp"
29
30uint GCId::_next_id = 0;
31
32NamedThread* currentNamedthread() {
33  assert(Thread::current()->is_Named_thread(), "This thread must be NamedThread");
34  return (NamedThread*)Thread::current();
35}
36
37const uint GCId::create() {
38  return _next_id++;
39}
40
41const uint GCId::peek() {
42  return _next_id;
43}
44
45const uint GCId::current() {
46  assert(currentNamedthread()->gc_id() != undefined(), "Using undefined GC id.");
47  return current_raw();
48}
49
50const uint GCId::current_raw() {
51  return currentNamedthread()->gc_id();
52}
53
54size_t GCId::print_prefix(char* buf, size_t len) {
55  Thread* thread = Thread::current_or_null();
56  if (thread != NULL && thread->is_Named_thread()) {
57    uint gc_id = current_raw();
58    if (gc_id != undefined()) {
59      int ret = jio_snprintf(buf, len, "GC(%u) ", gc_id);
60      assert(ret > 0, "Failed to print prefix. Log buffer too small?");
61      return (size_t)ret;
62    }
63  }
64  return 0;
65}
66
67GCIdMark::GCIdMark() : _gc_id(GCId::create()) {
68  currentNamedthread()->set_gc_id(_gc_id);
69}
70
71GCIdMark::GCIdMark(uint gc_id) : _gc_id(gc_id) {
72  currentNamedthread()->set_gc_id(_gc_id);
73}
74
75GCIdMark::~GCIdMark() {
76  currentNamedthread()->set_gc_id(GCId::undefined());
77}
78
79GCIdMarkAndRestore::GCIdMarkAndRestore() : _gc_id(GCId::create()) {
80  _previous_gc_id = GCId::current_raw();
81  currentNamedthread()->set_gc_id(_gc_id);
82}
83
84GCIdMarkAndRestore::GCIdMarkAndRestore(uint gc_id) : _gc_id(gc_id) {
85  _previous_gc_id = GCId::current_raw();
86  currentNamedthread()->set_gc_id(_gc_id);
87}
88
89GCIdMarkAndRestore::~GCIdMarkAndRestore() {
90  currentNamedthread()->set_gc_id(_previous_gc_id);
91}
92