src/hotspot/share/runtime/safepointMechanism.hpp
author pchilanomate
Tue, 05 Feb 2019 15:12:13 -0500
changeset 53646 043ae846819f
parent 53631 a5321bcfa2de
child 53775 5d20b085d893
permissions -rw-r--r--
8210832: Remove sneaky locking in class Monitor Summary: Removed sneaky locking and simplified vm monitors implementation Reviewed-by: rehn, dcubed, pliden, dholmes, coleenp Contributed-by: david.holmes@oracle.com, patricio.chilano.mateo@oracle.com
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/*
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 * Copyright (c) 2017, 2019, 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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#ifndef SHARE_RUNTIME_SAFEPOINTMECHANISM_HPP
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#define SHARE_RUNTIME_SAFEPOINTMECHANISM_HPP
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#include "runtime/globals.hpp"
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#include "utilities/globalDefinitions.hpp"
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#include "utilities/macros.hpp"
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#include "utilities/sizes.hpp"
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// This is the abstracted interface for the safepoint implementation
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class SafepointMechanism : public AllStatic {
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  enum PollingType {
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    _global_page_poll,
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    _thread_local_poll
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  };
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  static PollingType _polling_type;
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  static void* _poll_armed_value;
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  static void* _poll_disarmed_value;
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  static void set_uses_thread_local_poll()            { _polling_type     = _thread_local_poll; }
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  static void* poll_armed_value()                     { return _poll_armed_value; }
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  static void* poll_disarmed_value()                  { return _poll_disarmed_value; }
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  static inline bool local_poll_armed(JavaThread* thread);
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  static inline bool local_poll(Thread* thread);
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  static inline bool global_poll();
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  static void block_if_requested_slow(JavaThread *thread);
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  static void default_initialize();
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  static void pd_initialize() NOT_AIX({ default_initialize(); });
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  // By adding 8 to the base address of the protected polling page we can differentiate
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  // between the armed and disarmed value by masking out this bit.
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  const static intptr_t _poll_bit = 8;
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public:
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  static intptr_t poll_bit() { return _poll_bit; }
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  static bool uses_global_page_poll() { return _polling_type == _global_page_poll; }
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  static bool uses_thread_local_poll() { return _polling_type == _thread_local_poll; }
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  static bool supports_thread_local_poll() {
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#ifdef THREAD_LOCAL_POLL
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    return true;
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#else
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    return false;
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#endif
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  }
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  // Call this method to see if this thread should block for a safepoint or process handshake.
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  static inline bool should_block(Thread* thread);
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  // Blocks a thread until safepoint/handshake is completed.
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  static inline void block_if_requested(JavaThread* thread);
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  // Calls back if there is a pending safepoint but does not block for it.
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  static inline void callback_if_safepoint(JavaThread* thread);
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  // Caller is responsible for using a memory barrier if needed.
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  static inline void arm_local_poll(JavaThread* thread);
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  static inline void disarm_local_poll(JavaThread* thread);
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  static inline void arm_local_poll_release(JavaThread* thread);
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  static inline void disarm_local_poll_release(JavaThread* thread);
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  // Setup the selected safepoint mechanism
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  static void initialize();
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  static void initialize_header(JavaThread* thread);
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};
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#endif // SHARE_RUNTIME_SAFEPOINTMECHANISM_HPP