1 /*
   2  * Copyright (c) 2014, 2015, Dynatrace and/or its affiliates. All rights reserved.
   3  *
   4  * This file is part of the Lock Contention Tracing Subsystem for the HotSpot
   5  * Virtual Machine, which is developed at Christian Doppler Laboratory on
   6  * Monitoring and Evolution of Very-Large-Scale Software Systems. Please
   7  * contact us at <http://mevss.jku.at/> if you need additional information
   8  * or have any questions.
   9  *
  10  * This code is free software; you can redistribute it and/or modify it
  11  * under the terms of the GNU General Public License version 2 only, as
  12  * published by the Free Software Foundation.
  13  *
  14  * This code is distributed in the hope that it will be useful, but WITHOUT
  15  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17  * version 2 for more details (a copy is included in the LICENSE file that
  18  * accompanied this code).
  19  *
  20  * You should have received a copy of the GNU General Public License version
  21  * 2 along with this work. If not, see <http://www.gnu.org/licenses/>.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_EVTRACE_TRACEMACROS_HPP
  26 #define SHARE_VM_EVTRACE_TRACEMACROS_HPP
  27 
  28 #include "runtime/atomic.hpp"
  29 
  30 #define EVTRACE_DECLARE_TRACKED_CLASS_FIELDS \
  31   jint _tracing_known;
  32 
  33 #define EVTRACE_INIT_TRACKED_CLASS \
  34   do { _tracing_known = 0; } while (0)
  35 
  36 #define EVTRACE_DEFINE_TRACKED_CLASS_METHODS                 \
  37   bool is_tracing_known() const {                            \
  38     return _tracing_known;                                   \
  39   }                                                          \
  40                                                              \
  41   bool atomic_mark_tracing_known() {                         \
  42     return (Atomic::cmpxchg(1, &_tracing_known, 0) == 0);    \
  43   }                                                          \
  44                                                              \
  45   void reset_tracing_known() {                               \
  46     /* permitted at safepoint only, no CAS required */       \
  47     _tracing_known = 0;                                      \
  48   }
  49 
  50 #endif /* SHARE_VM_EVTRACE_TRACEMACROS_HPP */