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25 
26 #ifndef OS_AIX_VM_OSTHREAD_AIX_HPP
27 #define OS_AIX_VM_OSTHREAD_AIX_HPP
28 
29  public:
30   typedef pid_t thread_id_t;
31 
32  private:
33   int _thread_type;
34 
35  public:
36 
37   int thread_type() const {
38     return _thread_type;
39   }
set_thread_type(int type)40   void set_thread_type(int type) {
41     _thread_type = type;
42   }
43 
44  private:
45 
46   // _pthread_id is the pthread id, which is used by library calls
47   // (e.g. pthread_kill).
48   pthread_t _pthread_id;
49 
50   sigset_t _caller_sigmask; // Caller's signal mask
51 
52  public:
53 
54   // Methods to save/restore caller's signal mask
55   sigset_t  caller_sigmask() const       { return _caller_sigmask; }
set_caller_sigmask(sigset_t sigmask)56   void    set_caller_sigmask(sigset_t sigmask)  { _caller_sigmask = sigmask; }
57 
58 #ifndef PRODUCT
59   // Used for debugging, return a unique integer for each thread.
thread_identifier() const60   int thread_identifier() const   { return _thread_id; }
61 #endif
62 #ifdef ASSERT
63   // We expect no reposition failures so kill vm if we get one.
64   //
valid_reposition_failure()65   bool valid_reposition_failure() {
66     return false;
67   }
68 #endif // ASSERT
pthread_id() const69   pthread_t pthread_id() const {
70     return _pthread_id;
71   }
set_pthread_id(pthread_t tid)72   void set_pthread_id(pthread_t tid) {
73     _pthread_id = tid;
74   }
75 
76   // ***************************************************************
77   // suspension support.
78   // ***************************************************************
79 
80  public:
81   // flags that support signal based suspend/resume on Linux are in a
82   // separate class to avoid confusion with many flags in OSThread that
83   // are used by VM level suspend/resume.
84   os::SuspendResume sr;
85 
86   // _ucontext and _siginfo are used by SR_handler() to save thread context,
87   // and they will later be used to walk the stack or reposition thread PC.
88   // If the thread is not suspended in SR_handler() (e.g. self suspend),
89   // the value in _ucontext is meaningless, so we must use the last Java
90   // frame information as the frame. This will mean that for threads
91   // that are parked on a mutex the profiler (and safepoint mechanism)
92   // will see the thread as if it were still in the Java frame. This
93   // not a problem for the profiler since the Java frame is a close
94   // enough result. For the safepoint mechanism when the give it the
95   // Java frame we are not at a point where the safepoint needs the
96   // frame to that accurate (like for a compiled safepoint) since we
97   // should be in a place where we are native and will block ourselves
98   // if we transition.
99  private:
100   void* _siginfo;
101   ucontext_t* _ucontext;
102   int _expanding_stack;                 // non zero if manually expanding stack
103   address _alt_sig_stack;               // address of base of alternate signal stack
104 
105  public:
106   void* siginfo() const                   { return _siginfo;  }
set_siginfo(void * ptr)107   void set_siginfo(void* ptr)             { _siginfo = ptr;   }
ucontext() const108   ucontext_t* ucontext() const            { return _ucontext; }
set_ucontext(ucontext_t * ptr)109   void set_ucontext(ucontext_t* ptr)      { _ucontext = ptr;  }
set_expanding_stack(void)110   void set_expanding_stack(void)          { _expanding_stack = 1;  }
clear_expanding_stack(void)111   void clear_expanding_stack(void)        { _expanding_stack = 0;  }
expanding_stack(void)112   int  expanding_stack(void)              { return _expanding_stack;  }
113 
set_alt_sig_stack(address val)114   void set_alt_sig_stack(address val)     { _alt_sig_stack = val; }
alt_sig_stack(void)115   address alt_sig_stack(void)             { return _alt_sig_stack; }
116 
117  private:
118   Monitor* _startThread_lock;     // sync parent and child in thread creation
119 
120  public:
121 
122   Monitor* startThread_lock() const {
123     return _startThread_lock;
124   }
125 
126   // ***************************************************************
127   // Platform dependent initialization and cleanup
128   // ***************************************************************
129 
130  private:
131 
132   void pd_initialize();
133   void pd_destroy();
134 
135  public:
136 
137   // The last measured values of cpu timing to prevent the "stale
138   // value return" bug in thread_cpu_time.
139   volatile struct {
140     jlong sys;
141     jlong user;
142   } _last_cpu_times;
143 
144 #endif // OS_AIX_VM_OSTHREAD_AIX_HPP
145