| /* |
| * 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. |
| * |
| */ |
| |
| #ifndef SHARE_VM_GC_SHARED_CONCURRENTGCTHREAD_HPP |
| #define SHARE_VM_GC_SHARED_CONCURRENTGCTHREAD_HPP |
| |
| #include "runtime/thread.hpp" |
| #include "utilities/macros.hpp" |
| |
| class ConcurrentGCThread: public NamedThread { |
| friend class VMStructs; |
| |
| protected: |
| bool volatile _should_terminate; |
| bool _has_terminated; |
| |
| // Create and start the thread (setting it's priority high.) |
| void create_and_start(); |
| |
| // Do initialization steps in the thread: record stack base and size, |
| // init thread local storage, set JNI handle block. |
| void initialize_in_thread(); |
| |
| // Wait until Universe::is_fully_initialized(); |
| void wait_for_universe_init(); |
| |
| // Record that the current thread is terminating, and will do more |
| // concurrent work. |
| void terminate(); |
| |
| public: |
| ConcurrentGCThread(); |
| |
| // Tester |
| bool is_ConcurrentGC_thread() const { return true; } |
| }; |
| |
| // The SurrogateLockerThread is used by concurrent GC threads for |
| // manipulating Java monitors, in particular, currently for |
| // manipulating the pending_list_lock. XXX |
| class SurrogateLockerThread: public JavaThread { |
| friend class VMStructs; |
| public: |
| enum SLT_msg_type { |
| empty = 0, // no message |
| acquirePLL, // acquire pending list lock |
| releaseAndNotifyPLL // notify and release pending list lock |
| }; |
| private: |
| // the following are shared with the CMSThread |
| SLT_msg_type _buffer; // communication buffer |
| Monitor _monitor; // monitor controlling buffer |
| BasicLock _basicLock; // used for PLL locking |
| |
| public: |
| static SurrogateLockerThread* make(TRAPS); |
| |
| // Terminate VM with error message that SLT needed but not yet created. |
| static void report_missing_slt(); |
| |
| SurrogateLockerThread(); |
| |
| bool is_hidden_from_external_view() const { return true; } |
| |
| void loop(); // main method |
| |
| void manipulatePLL(SLT_msg_type msg); |
| |
| }; |
| |
| #endif // SHARE_VM_GC_SHARED_CONCURRENTGCTHREAD_HPP |