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1 /*
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2 * Copyright 1997-2005 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // The OSThread class holds OS-specific thread information. It is equivalent
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26 // to the sys_thread_t structure of the classic JVM implementation.
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27
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28 // The thread states represented by the ThreadState values are platform-specific
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29 // and are likely to be only approximate, because most OSes don't give you access
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30 // to precise thread state information.
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31
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32 // Note: the ThreadState is legacy code and is not correctly implemented.
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33 // Uses of ThreadState need to be replaced by the state in the JavaThread.
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34
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35 enum ThreadState {
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36 ALLOCATED, // Memory has been allocated but not initialized
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37 INITIALIZED, // The thread has been initialized but yet started
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38 RUNNABLE, // Has been started and is runnable, but not necessarily running
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39 MONITOR_WAIT, // Waiting on a contended monitor lock
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40 CONDVAR_WAIT, // Waiting on a condition variable
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41 OBJECT_WAIT, // Waiting on an Object.wait() call
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42 BREAKPOINTED, // Suspended at breakpoint
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43 SLEEPING, // Thread.sleep()
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44 ZOMBIE // All done, but not reclaimed yet
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45 };
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46
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47 // I'd make OSThread a ValueObj embedded in Thread to avoid an indirection, but
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48 // the assembler test in java.cpp expects that it can install the OSThread of
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49 // the main thread into its own Thread at will.
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50
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51
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52 class OSThread: public CHeapObj {
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53 friend class VMStructs;
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54 private:
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55 //void* _start_proc; // Thread start routine
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56 OSThreadStartFunc _start_proc; // Thread start routine
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57 void* _start_parm; // Thread start routine parameter
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58 volatile ThreadState _state; // Thread state *hint*
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59 jint _interrupted; // Thread.isInterrupted state
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60
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61 // Note: _interrupted must be jint, so that Java intrinsics can access it.
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62 // The value stored there must be either 0 or 1. It must be possible
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63 // for Java to emulate Thread.currentThread().isInterrupted() by performing
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64 // the double indirection Thread::current()->_osthread->_interrupted.
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65
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66 // Methods
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67 public:
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68 void set_state(ThreadState state) { _state = state; }
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69 ThreadState get_state() { return _state; }
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70
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71 // Constructor
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72 OSThread(OSThreadStartFunc start_proc, void* start_parm);
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73
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74 // Destructor
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75 ~OSThread();
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76
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77 // Accessors
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78 OSThreadStartFunc start_proc() const { return _start_proc; }
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79 void set_start_proc(OSThreadStartFunc start_proc) { _start_proc = start_proc; }
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80 void* start_parm() const { return _start_parm; }
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81 void set_start_parm(void* start_parm) { _start_parm = start_parm; }
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82
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83 bool interrupted() const { return _interrupted != 0; }
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84 void set_interrupted(bool z) { _interrupted = z ? 1 : 0; }
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85
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86 // Printing
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87 void print_on(outputStream* st) const;
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88 void print() const { print_on(tty); }
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89
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90 // For java intrinsics:
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91 static ByteSize interrupted_offset() { return byte_offset_of(OSThread, _interrupted); }
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92
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93 // Platform dependent stuff
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94 #include "incls/_osThread_pd.hpp.incl"
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95 };
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96
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97
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98 // Utility class for use with condition variables:
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99 class OSThreadWaitState : public StackObj {
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100 OSThread* _osthread;
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101 ThreadState _old_state;
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102 public:
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103 OSThreadWaitState(OSThread* osthread, bool is_object_wait) {
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104 _osthread = osthread;
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105 _old_state = osthread->get_state();
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106 if (is_object_wait) {
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107 osthread->set_state(OBJECT_WAIT);
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108 } else {
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109 osthread->set_state(CONDVAR_WAIT);
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110 }
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111 }
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112 ~OSThreadWaitState() {
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113 _osthread->set_state(_old_state);
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114 }
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115 };
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116
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117
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118 // Utility class for use with contended monitors:
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119 class OSThreadContendState : public StackObj {
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120 OSThread* _osthread;
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121 ThreadState _old_state;
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122 public:
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123 OSThreadContendState(OSThread* osthread) {
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124 _osthread = osthread;
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125 _old_state = osthread->get_state();
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126 osthread->set_state(MONITOR_WAIT);
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127 }
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128 ~OSThreadContendState() {
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129 _osthread->set_state(_old_state);
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130 }
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131 };
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