1 /*
   2  * Copyright (c) 1997, 2019, 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.
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   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
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  24 
  25 #ifndef SHARE_RUNTIME_SAFEPOINTVERIFIERS_HPP
  26 #define SHARE_RUNTIME_SAFEPOINTVERIFIERS_HPP
  27 
  28 #include "memory/allocation.hpp"
  29 #include "runtime/thread.hpp"
  30 
  31 // A NoSafepointVerifier object will throw an assertion failure if
  32 // the current thread passes a possible safepoint while this object is
  33 // instantiated. A safepoint, will either be: an oop allocation, blocking
  34 // on a Mutex or JavaLock, or executing a VM operation.
  35 //
  36 class NoSafepointVerifier : public StackObj {
  37  friend class PauseNoSafepointVerifier;
  38 
  39  private:
  40   Thread *_thread;
  41  public:
  42   NoSafepointVerifier()  NOT_DEBUG_RETURN;
  43   ~NoSafepointVerifier() NOT_DEBUG_RETURN;
  44 };
  45 
  46 // A PauseNoSafepointVerifier is used to temporarily pause the
  47 // behavior of a NoSafepointVerifier object.
  48 
  49 class PauseNoSafepointVerifier : public StackObj {
  50  private:
  51   NoSafepointVerifier* _nsv;
  52 
  53  public:
  54   PauseNoSafepointVerifier(NoSafepointVerifier* nsv) NOT_DEBUG_RETURN;
  55   ~PauseNoSafepointVerifier() NOT_DEBUG_RETURN;
  56 };
  57 
  58 #endif // SHARE_RUNTIME_SAFEPOINTVERIFIERS_HPP