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1878
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1 /*
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2 * Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 //
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26 // class JvmtiRawMonitor
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27 //
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28 // Used by JVMTI methods: All RawMonitor methods (CreateRawMonitor, EnterRawMonitor, etc.)
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29 //
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30 // Wrapper for ObjectMonitor class that saves the Monitor's name
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31 //
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32
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33 class JvmtiRawMonitor : public ObjectMonitor {
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34 private:
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35 int _magic;
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36 char * _name;
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37 // JVMTI_RM_MAGIC is set in contructor and unset in destructor.
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38 enum { JVMTI_RM_MAGIC = (int)(('T' << 24) | ('I' << 16) | ('R' << 8) | 'M') };
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39
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40 int SimpleEnter (Thread * Self) ;
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41 int SimpleExit (Thread * Self) ;
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42 int SimpleWait (Thread * Self, jlong millis) ;
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43 int SimpleNotify (Thread * Self, bool All) ;
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44
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45 public:
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46 JvmtiRawMonitor(const char *name);
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47 ~JvmtiRawMonitor();
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48 int raw_enter(TRAPS);
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49 int raw_exit(TRAPS);
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50 int raw_wait(jlong millis, bool interruptable, TRAPS);
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51 int raw_notify(TRAPS);
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52 int raw_notifyAll(TRAPS);
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53 int magic() { return _magic; }
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54 const char *get_name() { return _name; }
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55 bool is_valid();
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56 };
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57
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58 // Onload pending raw monitors
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59 // Class is used to cache onload or onstart monitor enter
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60 // which will transition into real monitor when
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61 // VM is fully initialized.
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62 class JvmtiPendingMonitors : public AllStatic {
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63
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64 private:
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65 static GrowableArray<JvmtiRawMonitor*> *_monitors; // Cache raw monitor enter
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66
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67 inline static GrowableArray<JvmtiRawMonitor*>* monitors() { return _monitors; }
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68
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69 static void dispose() {
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70 delete monitors();
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71 }
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72
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73 public:
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74 static void enter(JvmtiRawMonitor *monitor) {
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75 monitors()->append(monitor);
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76 }
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77
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78 static int count() {
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79 return monitors()->length();
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80 }
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81
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82 static void destroy(JvmtiRawMonitor *monitor) {
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83 while (monitors()->contains(monitor)) {
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84 monitors()->remove(monitor);
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85 }
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86 }
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87
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88 // Return false if monitor is not found in the list.
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89 static bool exit(JvmtiRawMonitor *monitor) {
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90 if (monitors()->contains(monitor)) {
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91 monitors()->remove(monitor);
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92 return true;
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93 } else {
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94 return false;
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95 }
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96 }
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97
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98 static void transition_raw_monitors();
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99 };
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