1/*
2 * Copyright (c) 1999, 2013, 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.
8 *
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
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25#ifndef SHARE_VM_PRIMS_JVMTIRAWMONITOR_HPP
26#define SHARE_VM_PRIMS_JVMTIRAWMONITOR_HPP
27
28#include "runtime/objectMonitor.hpp"
29#include "utilities/growableArray.hpp"
30
31//
32// class JvmtiRawMonitor
33//
34// Used by JVMTI methods: All RawMonitor methods (CreateRawMonitor, EnterRawMonitor, etc.)
35//
36// Wrapper for ObjectMonitor class that saves the Monitor's name
37//
38
39class JvmtiRawMonitor : public ObjectMonitor  {
40private:
41  int           _magic;
42  char *        _name;
43  // JVMTI_RM_MAGIC is set in contructor and unset in destructor.
44  enum { JVMTI_RM_MAGIC = (int)(('T' << 24) | ('I' << 16) | ('R' << 8) | 'M') };
45
46  int       SimpleEnter (Thread * Self) ;
47  int       SimpleExit  (Thread * Self) ;
48  int       SimpleWait  (Thread * Self, jlong millis) ;
49  int       SimpleNotify (Thread * Self, bool All) ;
50
51public:
52  JvmtiRawMonitor(const char *name);
53  ~JvmtiRawMonitor();
54  int       raw_enter(TRAPS);
55  int       raw_exit(TRAPS);
56  int       raw_wait(jlong millis, bool interruptable, TRAPS);
57  int       raw_notify(TRAPS);
58  int       raw_notifyAll(TRAPS);
59  int            magic()   { return _magic;  }
60  const char *get_name()   { return _name; }
61  bool        is_valid();
62};
63
64// Onload pending raw monitors
65// Class is used to cache onload or onstart monitor enter
66// which will transition into real monitor when
67// VM is fully initialized.
68class JvmtiPendingMonitors : public AllStatic {
69
70private:
71  static GrowableArray<JvmtiRawMonitor*> *_monitors; // Cache raw monitor enter
72
73  inline static GrowableArray<JvmtiRawMonitor*>* monitors() { return _monitors; }
74
75  static void dispose() {
76    delete monitors();
77  }
78
79public:
80  static void enter(JvmtiRawMonitor *monitor) {
81    monitors()->append(monitor);
82  }
83
84  static int count() {
85    return monitors()->length();
86  }
87
88  static void destroy(JvmtiRawMonitor *monitor) {
89    while (monitors()->contains(monitor)) {
90      monitors()->remove(monitor);
91    }
92  }
93
94  // Return false if monitor is not found in the list.
95  static bool exit(JvmtiRawMonitor *monitor) {
96    if (monitors()->contains(monitor)) {
97      monitors()->remove(monitor);
98      return true;
99    } else {
100      return false;
101    }
102  }
103
104  static void transition_raw_monitors();
105};
106
107#endif // SHARE_VM_PRIMS_JVMTIRAWMONITOR_HPP
108