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 30 uint GCId::_next_id = 0; 31 32 NamedThread* currentNamedthread() { 33 assert(Thread::current()->is_Named_thread(), "This thread must be NamedThread"); 34 return (NamedThread*)Thread::current(); 35 } 36 37 const uint GCId::create() { 38 return _next_id++; 39 } 40 41 const uint GCId::peek() { 42 return _next_id; 43 } 44 45 const uint GCId::current() { 46 assert(currentNamedthread()->gc_id() != undefined(), "Using undefined GC id."); 47 return current_raw(); 48 } 49 50 const uint GCId::current_raw() { 51 return currentNamedthread()->gc_id(); 52 } 53 54 size_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 67 GCIdMark::GCIdMark() : _gc_id(GCId::create()) { 68 currentNamedthread()->set_gc_id(_gc_id); 69 } 70 71 GCIdMark::GCIdMark(uint gc_id) : _gc_id(gc_id) { 72 currentNamedthread()->set_gc_id(_gc_id); 73 } 74 75 GCIdMark::~GCIdMark() { 76 currentNamedthread()->set_gc_id(GCId::undefined()); 77 } 78 79 GCIdMarkAndRestore::GCIdMarkAndRestore() : _gc_id(GCId::create()) { 80 _previous_gc_id = GCId::current_raw(); 81 currentNamedthread()->set_gc_id(_gc_id); 82 } 83 84 GCIdMarkAndRestore::GCIdMarkAndRestore(uint gc_id) : _gc_id(gc_id) { 85 _previous_gc_id = GCId::current_raw(); 86 currentNamedthread()->set_gc_id(_gc_id); 87 } 88 89 GCIdMarkAndRestore::~GCIdMarkAndRestore() { 90 currentNamedthread()->set_gc_id(_previous_gc_id); 91 }