src/hotspot/share/jfr/writers/jfrMemoryWriterHost.hpp

/*
 * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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#ifndef SHARE_VM_JFR_WRITERS_JFRMEMORYWRITERHOST_HPP
#define SHARE_VM_JFR_WRITERS_JFRMEMORYWRITERHOST_HPP

#include "jfr/writers/jfrStorageHost.inline.hpp"

#ifdef ASSERT
class ExclusiveAccessAssert {
 private:
  bool _acquired;
 public:
  ExclusiveAccessAssert() : _acquired(false) {}
  void acquire() { assert_non_acquired(); _acquired = true; }
  void release() { assert_acquired(); _acquired = false; }
  bool is_acquired() const { return _acquired; }
  void assert_acquired() const { assert(_acquired, "Not acquired!"); }
  void assert_non_acquired() const { assert(!_acquired, "Already acquired!"); }
};
#else
 class ExclusiveAccessAssert {};
#endif

template <typename Adapter, typename AP, typename AccessAssert = ExclusiveAccessAssert>
class MemoryWriterHost : public StorageHost<Adapter, AP> {
  debug_only(AccessAssert _access;)
 public:
  typedef typename Adapter::StorageType StorageType;
 protected:
  void bytes(void* dest, const void* buf, size_t len);
  MemoryWriterHost(StorageType* storage, Thread* thread);
  MemoryWriterHost(StorageType* storage, size_t size);
  MemoryWriterHost(Thread* thread);
  debug_only(bool is_acquired() const;)
 public:
  void acquire();
  void release();
};

template <typename Adapter, typename AP>
class AcquireReleaseMemoryWriterHost : public MemoryWriterHost<Adapter, AP> {
 public:
  typedef typename Adapter::StorageType StorageType;
  AcquireReleaseMemoryWriterHost(StorageType* storage, Thread* thread);
  AcquireReleaseMemoryWriterHost(StorageType* storage, size_t size);
  AcquireReleaseMemoryWriterHost(Thread* thread);
  ~AcquireReleaseMemoryWriterHost();
};

#endif // SHARE_VM_JFR_WRITERS_JFRMEMORYWRITERHOST_HPP