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 
  39 class JvmtiRawMonitor : public ObjectMonitor  {
  40 private:
  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 
  51 public:
  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.
  68 class JvmtiPendingMonitors : public AllStatic {
  69 
  70 private:
  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 
  79 public:
  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