1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_HPP
  26 #define SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_HPP
  27 
  28 #include "runtime/globals.hpp"
  29 #include "utilities/globalDefinitions.hpp"
  30 #include "utilities/macros.hpp"
  31 #include "utilities/sizes.hpp"
  32 
  33 class JavaThread;
  34 
  35 // This is the abstracted interface for the safepoint implementation
  36 class SafepointMechanism : public AllStatic {
  37   static inline bool global_poll();
  38 
  39   static void default_initialize();
  40   static void initialize_serialize_page();
  41 
  42   static void pd_initialize() NOT_AIX({ default_initialize(); });
  43 
  44 public:
  45 
  46   // Call this method to see if this thread has depending poll and appropriate action should be taken
  47   static inline bool poll();
  48 
  49   // Blocks a thread until safepoint is completed
  50   static inline void block_if_requested(JavaThread* thread);
  51 
  52   // Setup the selected safepoint mechanism
  53   static void initialize();
  54 };
  55 
  56 #endif // SHARE_VM_RUNTIME_SAFEPOINTMECHANISM_HPP