gcId.cpp revision 13184:7903df1b0c4f 
1/*
2 * Copyright (c) 2014, 2017, 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
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23 */
24
25#include "precompiled.hpp"
26#include "gc/shared/gcId.hpp"
27#include "prims/jvm.h"
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
38const uint GCId::create() {
39  return _next_id++;
40}
41
42const uint GCId::peek() {
43  return _next_id;
44}
45
46const uint GCId::current() {
47  assert(currentNamedthread()->gc_id() != undefined(), "Using undefined GC id.");
48  return current_raw();
49}
50
51const uint GCId::current_raw() {
52  return currentNamedthread()->gc_id();
53}
54
55size_t GCId::print_prefix(char* buf, size_t len) {
56  Thread* thread = Thread::current_or_null();
57  if (thread != NULL && thread->is_Named_thread()) {
58    uint gc_id = current_raw();
59    if (gc_id != undefined()) {
60      int ret = jio_snprintf(buf, len, "GC(%u) ", gc_id);
61      assert(ret > 0, "Failed to print prefix. Log buffer too small?");
62      return (size_t)ret;
63    }
64  }
65  return 0;
66}
67
68GCIdMark::GCIdMark() : _gc_id(GCId::create()) {
69  currentNamedthread()->set_gc_id(_gc_id);
70}
71
72GCIdMark::GCIdMark(uint gc_id) : _gc_id(gc_id) {
73  currentNamedthread()->set_gc_id(_gc_id);
74}
75
76GCIdMark::~GCIdMark() {
77  currentNamedthread()->set_gc_id(GCId::undefined());
78}
79
80GCIdMarkAndRestore::GCIdMarkAndRestore() : _gc_id(GCId::create()) {
81  _previous_gc_id = GCId::current_raw();
82  currentNamedthread()->set_gc_id(_gc_id);
83}
84
85GCIdMarkAndRestore::GCIdMarkAndRestore(uint gc_id) : _gc_id(gc_id) {
86  _previous_gc_id = GCId::current_raw();
87  currentNamedthread()->set_gc_id(_gc_id);
88}
89
90GCIdMarkAndRestore::~GCIdMarkAndRestore() {
91  currentNamedthread()->set_gc_id(_previous_gc_id);
92}
93