| /* |
| * Copyright (c) 2001, 2016, 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 "classfile/systemDictionary.hpp" |
| #include "gc/shared/concurrentGCThread.hpp" |
| #include "oops/instanceRefKlass.hpp" |
| #include "oops/oop.inline.hpp" |
| #include "runtime/init.hpp" |
| #include "runtime/interfaceSupport.hpp" |
| #include "runtime/java.hpp" |
| #include "runtime/javaCalls.hpp" |
| #include "runtime/os.hpp" |
| |
| ConcurrentGCThread::ConcurrentGCThread() : |
| _should_terminate(false), _has_terminated(false) { |
| }; |
| |
| void ConcurrentGCThread::create_and_start(ThreadPriority prio) { |
| if (os::create_thread(this, os::cgc_thread)) { |
| // XXX: need to set this to low priority |
| // unless "aggressive mode" set; priority |
| // should be just less than that of VMThread. |
| os::set_priority(this, prio); |
| if (!_should_terminate) { |
| os::start_thread(this); |
| } |
| } |
| } |
| |
| void ConcurrentGCThread::initialize_in_thread() { |
| this->record_stack_base_and_size(); |
| this->initialize_named_thread(); |
| this->set_active_handles(JNIHandleBlock::allocate_block()); |
| // From this time Thread::current() should be working. |
| assert(this == Thread::current(), "just checking"); |
| } |
| |
| void ConcurrentGCThread::wait_for_universe_init() { |
| MutexLockerEx x(CGC_lock, Mutex::_no_safepoint_check_flag); |
| while (!is_init_completed() && !_should_terminate) { |
| CGC_lock->wait(Mutex::_no_safepoint_check_flag, 1); |
| } |
| } |
| |
| void ConcurrentGCThread::terminate() { |
| assert(_should_terminate, "Should only be called on terminate request."); |
| // Signal that it is terminated |
| { |
| MutexLockerEx mu(Terminator_lock, |
| Mutex::_no_safepoint_check_flag); |
| _has_terminated = true; |
| Terminator_lock->notify(); |
| } |
| } |
| |
| void ConcurrentGCThread::run() { |
| initialize_in_thread(); |
| wait_for_universe_init(); |
| |
| run_service(); |
| |
| terminate(); |
| } |
| |
| void ConcurrentGCThread::stop() { |
| // it is ok to take late safepoints here, if needed |
| { |
| MutexLockerEx mu(Terminator_lock); |
| assert(!_has_terminated, "stop should only be called once"); |
| assert(!_should_terminate, "stop should only be called once"); |
| _should_terminate = true; |
| } |
| |
| stop_service(); |
| |
| { |
| MutexLockerEx mu(Terminator_lock); |
| while (!_has_terminated) { |
| Terminator_lock->wait(); |
| } |
| } |
| } |