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Java example source code file (threadCritical.hpp)

This example Java source code file (threadCritical.hpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

share_vm_runtime_threadcritical_hpp, stackobj, threadcritical

The threadCritical.hpp Java example source code

/*
 * Copyright (c) 2001, 2010, 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_VM_RUNTIME_THREADCRITICAL_HPP
#define SHARE_VM_RUNTIME_THREADCRITICAL_HPP

#include "memory/allocation.hpp"

// ThreadCritical is used to protect short non-blocking critical sections.
// This class must use no vm facilities that require initialization.
// It is used very early in the vm's initialization, in allocation
// code and other areas. ThreadCritical regions are reentrant.
//
// Due to race conditions during vm exit, some of the os level
// synchronization primitives may not be deallocated at exit. It
// is a good plan to implement the platform dependent sections of
// code with resources that are recoverable during process
// cleanup by the os. Calling the initialize method before use
// is also problematic, it is best to use preinitialized primitives
// if possible. As an example:
//
// mutex_t  mp  =  DEFAULTMUTEX;
//
// Also note that this class is declared as a StackObj to enforce
// block structured short locks. It cannot be declared a ResourceObj
// or CHeapObj, due to initialization issues.

class ThreadCritical : public StackObj {
 friend class os;
 private:
  static void initialize();
  static void release();

 public:
  ThreadCritical();
  ~ThreadCritical();
};

#endif // SHARE_VM_RUNTIME_THREADCRITICAL_HPP

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