hotspot/src/share/vm/prims/jvmtiRawMonitor.hpp
author zgu
Fri, 25 Jan 2013 10:04:08 -0500
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8000692: Remove old KERNEL code Summary: Removed depreciated kernel VM source code from hotspot VM Reviewed-by: dholmes, acorn
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/*
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 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_PRIMS_JVMTIRAWMONITOR_HPP
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#define SHARE_VM_PRIMS_JVMTIRAWMONITOR_HPP
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#include "runtime/objectMonitor.hpp"
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#include "utilities/growableArray.hpp"
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//
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// class JvmtiRawMonitor
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//
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// Used by JVMTI methods: All RawMonitor methods (CreateRawMonitor, EnterRawMonitor, etc.)
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//
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// Wrapper for ObjectMonitor class that saves the Monitor's name
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//
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class JvmtiRawMonitor : public ObjectMonitor  {
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private:
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  int           _magic;
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  char *        _name;
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  // JVMTI_RM_MAGIC is set in contructor and unset in destructor.
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  enum { JVMTI_RM_MAGIC = (int)(('T' << 24) | ('I' << 16) | ('R' << 8) | 'M') };
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  int       SimpleEnter (Thread * Self) ;
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  int       SimpleExit  (Thread * Self) ;
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  int       SimpleWait  (Thread * Self, jlong millis) ;
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  int       SimpleNotify (Thread * Self, bool All) ;
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public:
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  JvmtiRawMonitor(const char *name);
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  ~JvmtiRawMonitor();
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  int       raw_enter(TRAPS);
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  int       raw_exit(TRAPS);
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  int       raw_wait(jlong millis, bool interruptable, TRAPS);
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  int       raw_notify(TRAPS);
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  int       raw_notifyAll(TRAPS);
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  int            magic()   { return _magic;  }
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  const char *get_name()   { return _name; }
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  bool        is_valid();
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};
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// Onload pending raw monitors
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// Class is used to cache onload or onstart monitor enter
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// which will transition into real monitor when
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// VM is fully initialized.
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class JvmtiPendingMonitors : public AllStatic {
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private:
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  static GrowableArray<JvmtiRawMonitor*> *_monitors; // Cache raw monitor enter
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  inline static GrowableArray<JvmtiRawMonitor*>* monitors() { return _monitors; }
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  static void dispose() {
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    delete monitors();
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  }
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public:
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  static void enter(JvmtiRawMonitor *monitor) {
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    monitors()->append(monitor);
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  }
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  static int count() {
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    return monitors()->length();
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  }
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  static void destroy(JvmtiRawMonitor *monitor) {
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    while (monitors()->contains(monitor)) {
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      monitors()->remove(monitor);
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    }
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  }
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  // Return false if monitor is not found in the list.
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  static bool exit(JvmtiRawMonitor *monitor) {
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    if (monitors()->contains(monitor)) {
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      monitors()->remove(monitor);
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      return true;
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    } else {
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      return false;
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    }
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  }
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  static void transition_raw_monitors();
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};
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#endif // SHARE_VM_PRIMS_JVMTIRAWMONITOR_HPP