osThread.hpp revision 1879:f95d63e2154a 
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24
25#ifndef SHARE_VM_RUNTIME_OSTHREAD_HPP
26#define SHARE_VM_RUNTIME_OSTHREAD_HPP
27
28#include "runtime/frame.hpp"
29#include "runtime/handles.hpp"
30#include "runtime/hpi.hpp"
31#include "runtime/javaFrameAnchor.hpp"
32#include "runtime/objectMonitor.hpp"
33#include "utilities/top.hpp"
34
35// The OSThread class holds OS-specific thread information.  It is equivalent
36// to the sys_thread_t structure of the classic JVM implementation.
37
38// The thread states represented by the ThreadState values are platform-specific
39// and are likely to be only approximate, because most OSes don't give you access
40// to precise thread state information.
41
42// Note: the ThreadState is legacy code and is not correctly implemented.
43// Uses of ThreadState need to be replaced by the state in the JavaThread.
44
45enum ThreadState {
46  ALLOCATED,                    // Memory has been allocated but not initialized
47  INITIALIZED,                  // The thread has been initialized but yet started
48  RUNNABLE,                     // Has been started and is runnable, but not necessarily running
49  MONITOR_WAIT,                 // Waiting on a contended monitor lock
50  CONDVAR_WAIT,                 // Waiting on a condition variable
51  OBJECT_WAIT,                  // Waiting on an Object.wait() call
52  BREAKPOINTED,                 // Suspended at breakpoint
53  SLEEPING,                     // Thread.sleep()
54  ZOMBIE                        // All done, but not reclaimed yet
55};
56
57// I'd make OSThread a ValueObj embedded in Thread to avoid an indirection, but
58// the assembler test in java.cpp expects that it can install the OSThread of
59// the main thread into its own Thread at will.
60
61
62class OSThread: public CHeapObj {
63  friend class VMStructs;
64 private:
65  //void* _start_proc;            // Thread start routine
66  OSThreadStartFunc _start_proc;  // Thread start routine
67  void* _start_parm;              // Thread start routine parameter
68  volatile ThreadState _state;    // Thread state *hint*
69  jint _interrupted;              // Thread.isInterrupted state
70
71  // Note:  _interrupted must be jint, so that Java intrinsics can access it.
72  // The value stored there must be either 0 or 1.  It must be possible
73  // for Java to emulate Thread.currentThread().isInterrupted() by performing
74  // the double indirection Thread::current()->_osthread->_interrupted.
75
76  // Methods
77 public:
78  void set_state(ThreadState state)                { _state = state; }
79  ThreadState get_state()                          { return _state; }
80
81  // Constructor
82  OSThread(OSThreadStartFunc start_proc, void* start_parm);
83
84  // Destructor
85  ~OSThread();
86
87  // Accessors
88  OSThreadStartFunc start_proc() const              { return _start_proc; }
89  void set_start_proc(OSThreadStartFunc start_proc) { _start_proc = start_proc; }
90  void* start_parm() const                          { return _start_parm; }
91  void set_start_parm(void* start_parm)             { _start_parm = start_parm; }
92
93  bool interrupted() const                          { return _interrupted != 0; }
94  void set_interrupted(bool z)                      { _interrupted = z ? 1 : 0; }
95
96  // Printing
97  void print_on(outputStream* st) const;
98  void print() const                                { print_on(tty); }
99
100  // For java intrinsics:
101  static ByteSize interrupted_offset()            { return byte_offset_of(OSThread, _interrupted); }
102
103  // Platform dependent stuff
104#ifdef TARGET_OS_FAMILY_linux
105# include "osThread_linux.hpp"
106#endif
107#ifdef TARGET_OS_FAMILY_solaris
108# include "osThread_solaris.hpp"
109#endif
110#ifdef TARGET_OS_FAMILY_windows
111# include "osThread_windows.hpp"
112#endif
113
114};
115
116
117// Utility class for use with condition variables:
118class OSThreadWaitState : public StackObj {
119  OSThread*   _osthread;
120  ThreadState _old_state;
121 public:
122  OSThreadWaitState(OSThread* osthread, bool is_object_wait) {
123    _osthread  = osthread;
124    _old_state = osthread->get_state();
125    if (is_object_wait) {
126      osthread->set_state(OBJECT_WAIT);
127    } else {
128      osthread->set_state(CONDVAR_WAIT);
129    }
130  }
131  ~OSThreadWaitState() {
132    _osthread->set_state(_old_state);
133  }
134};
135
136
137// Utility class for use with contended monitors:
138class OSThreadContendState : public StackObj {
139  OSThread*   _osthread;
140  ThreadState _old_state;
141 public:
142  OSThreadContendState(OSThread* osthread) {
143    _osthread  = osthread;
144    _old_state = osthread->get_state();
145    osthread->set_state(MONITOR_WAIT);
146  }
147  ~OSThreadContendState() {
148    _osthread->set_state(_old_state);
149  }
150};
151
152#endif // SHARE_VM_RUNTIME_OSTHREAD_HPP
153