src/hotspot/share/gc/shared/concurrentGCThread.cpp
author stefank
Thu, 22 Feb 2018 18:36:32 +0100
changeset 49048 4e8c86b75428
parent 47216 71c04702a3d5
child 49449 ef5d5d343e2a
permissions -rw-r--r--
8198525: Move _size_policy out of GenCollectorPolicy into GenCollectedHeap Reviewed-by: pliden, sjohanss
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/*
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 * Copyright (c) 2001, 2016, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "classfile/systemDictionary.hpp"
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#include "gc/shared/concurrentGCThread.hpp"
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#include "oops/instanceRefKlass.hpp"
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#include "oops/oop.inline.hpp"
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#include "runtime/init.hpp"
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#include "runtime/interfaceSupport.hpp"
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#include "runtime/java.hpp"
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#include "runtime/javaCalls.hpp"
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#include "runtime/os.hpp"
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ConcurrentGCThread::ConcurrentGCThread() :
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  _should_terminate(false), _has_terminated(false) {
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};
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void ConcurrentGCThread::create_and_start(ThreadPriority prio) {
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  if (os::create_thread(this, os::cgc_thread)) {
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    // XXX: need to set this to low priority
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    // unless "aggressive mode" set; priority
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    // should be just less than that of VMThread.
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    os::set_priority(this, prio);
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    if (!_should_terminate) {
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      os::start_thread(this);
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    }
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  }
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}
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void ConcurrentGCThread::initialize_in_thread() {
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  this->record_stack_base_and_size();
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  this->initialize_named_thread();
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  this->set_active_handles(JNIHandleBlock::allocate_block());
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  // From this time Thread::current() should be working.
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  assert(this == Thread::current(), "just checking");
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}
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void ConcurrentGCThread::wait_for_universe_init() {
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  MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag);
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  while (!is_init_completed() && !_should_terminate) {
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    CGC_lock->wait(Mutex::_no_safepoint_check_flag, 1);
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  }
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}
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void ConcurrentGCThread::terminate() {
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  assert(_should_terminate, "Should only be called on terminate request.");
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  // Signal that it is terminated
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  {
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    MutexLockerEx mu(Terminator_lock,
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                     Mutex::_no_safepoint_check_flag);
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    _has_terminated = true;
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    Terminator_lock->notify();
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  }
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}
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void ConcurrentGCThread::run() {
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  initialize_in_thread();
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  wait_for_universe_init();
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  run_service();
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  terminate();
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}
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void ConcurrentGCThread::stop() {
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  // it is ok to take late safepoints here, if needed
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  {
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    MutexLockerEx mu(Terminator_lock);
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    assert(!_has_terminated,   "stop should only be called once");
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    assert(!_should_terminate, "stop should only be called once");
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    _should_terminate = true;
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  }
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  stop_service();
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  {
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    MutexLockerEx mu(Terminator_lock);
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    while (!_has_terminated) {
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      Terminator_lock->wait();
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    }
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  }
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}