104ecb2dd1
Introduce a way to execute a callback on threads without performing a global VM safepoint. Make it both possible and cheap to stop individual threads and not just all threads or none. Co-authored-by: Mikael Gerdin <mikael.gerdin@oracle.com> Co-authored-by: Erik Osterlund <erik.osterlund@oracle.com> Reviewed-by: mdoerr, neliasso, acorn, aph, coleenp, dholmes
91 lines
3.2 KiB
C++
91 lines
3.2 KiB
C++
/*
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* Copyright (c) 2017, 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_VM_RUNTIME_SAFEPOINTMECHANISM_HPP
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#define SHARE_VM_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 inline void block_if_requested_local_poll(JavaThread *thread);
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static void default_initialize();
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static void initialize_serialize_page();
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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 has depending poll and appropriate action should be taken
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static inline bool poll(Thread* thread);
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// Blocks a thread until safepoint is completed
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static inline void block_if_requested(JavaThread* thread);
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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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// 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_VM_RUNTIME_SAFEPOINTMECHANISM_HPP
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