/*

 * Copyright (c) 2014, 2018, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "jvm.h"

#include "gc/shared/gcId.hpp"

#include "runtime/safepoint.hpp"

#include "runtime/thread.inline.hpp"

uint GCId::_next_id = 0;

NamedThread* currentNamedthread() {

  assert(Thread::current()->is_Named_thread(), "This thread must be NamedThread");

  return (NamedThread*)Thread::current();

}

uint GCId::create() {

  return _next_id++;

}

uint GCId::peek() {

  return _next_id;

}

uint GCId::current() {

  const uint gc_id = currentNamedthread()->gc_id();

  assert(gc_id != undefined(), "Using undefined GC id.");

  return gc_id;

}

uint GCId::current_or_undefined() {

  return Thread::current()->is_Named_thread() ? currentNamedthread()->gc_id() : undefined();

}

size_t GCId::print_prefix(char* buf, size_t len) {

  Thread* thread = Thread::current_or_null();

  if (thread != NULL) {

    uint gc_id = current_or_undefined();

    if (gc_id != undefined()) {

      int ret = jio_snprintf(buf, len, "GC(%u) ", gc_id);

      assert(ret > 0, "Failed to print prefix. Log buffer too small?");

      return (size_t)ret;

    }

  }

  return 0;

}

GCIdMark::GCIdMark() : _previous_gc_id(currentNamedthread()->gc_id()) {

  currentNamedthread()->set_gc_id(GCId::create());

}

GCIdMark::GCIdMark(uint gc_id) : _previous_gc_id(currentNamedthread()->gc_id()) {

  currentNamedthread()->set_gc_id(gc_id);

}

GCIdMark::~GCIdMark() {

  currentNamedthread()->set_gc_id(_previous_gc_id);

}