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24 
25 #ifndef OS_LINUX_VM_OSTHREAD_LINUX_HPP
26 #define OS_LINUX_VM_OSTHREAD_LINUX_HPP
27  public:
28   typedef pid_t thread_id_t;
29 
30  private:
31   int _thread_type;
32 
33  public:
34 
35   int thread_type() const {
36     return _thread_type;
37   }
set_thread_type(int type)38   void set_thread_type(int type) {
39     _thread_type = type;
40   }
41 
42   // _pthread_id is the pthread id, which is used by library calls
43   // (e.g. pthread_kill).
44   pthread_t _pthread_id;
45 
46   sigset_t _caller_sigmask; // Caller's signal mask
47 
48  public:
49 
50   // Methods to save/restore caller's signal mask
51   sigset_t  caller_sigmask() const       { return _caller_sigmask; }
set_caller_sigmask(sigset_t sigmask)52   void    set_caller_sigmask(sigset_t sigmask)  { _caller_sigmask = sigmask; }
53 
54 #ifndef PRODUCT
55   // Used for debugging, return a unique integer for each thread.
thread_identifier() const56   int thread_identifier() const   { return _thread_id; }
57 #endif
58 #ifdef ASSERT
59   // We expect no reposition failures so kill vm if we get one.
60   //
valid_reposition_failure()61   bool valid_reposition_failure() {
62     return false;
63   }
64 #endif // ASSERT
pthread_id() const65   pthread_t pthread_id() const {
66     return _pthread_id;
67   }
set_pthread_id(pthread_t tid)68   void set_pthread_id(pthread_t tid) {
69     _pthread_id = tid;
70   }
71 
72   // ***************************************************************
73   // suspension support.
74   // ***************************************************************
75 
76 public:
77   // flags that support signal based suspend/resume on Linux are in a
78   // separate class to avoid confusion with many flags in OSThread that
79   // are used by VM level suspend/resume.
80   os::SuspendResume sr;
81 
82   // _ucontext and _siginfo are used by SR_handler() to save thread context,
83   // and they will later be used to walk the stack or reposition thread PC.
84   // If the thread is not suspended in SR_handler() (e.g. self suspend),
85   // the value in _ucontext is meaningless, so we must use the last Java
86   // frame information as the frame. This will mean that for threads
87   // that are parked on a mutex the profiler (and safepoint mechanism)
88   // will see the thread as if it were still in the Java frame. This
89   // not a problem for the profiler since the Java frame is a close
90   // enough result. For the safepoint mechanism when the give it the
91   // Java frame we are not at a point where the safepoint needs the
92   // frame to that accurate (like for a compiled safepoint) since we
93   // should be in a place where we are native and will block ourselves
94   // if we transition.
95 private:
96   void* _siginfo;
97   ucontext_t* _ucontext;
98   int _expanding_stack;                 /* non zero if manually expanding stack */
99   address _alt_sig_stack;               /* address of base of alternate signal stack */
100 
101 public:
102   void* siginfo() const                   { return _siginfo;  }
set_siginfo(void * ptr)103   void set_siginfo(void* ptr)             { _siginfo = ptr;   }
ucontext() const104   ucontext_t* ucontext() const            { return _ucontext; }
set_ucontext(ucontext_t * ptr)105   void set_ucontext(ucontext_t* ptr)      { _ucontext = ptr;  }
set_expanding_stack(void)106   void set_expanding_stack(void)          { _expanding_stack = 1;  }
clear_expanding_stack(void)107   void clear_expanding_stack(void)        { _expanding_stack = 0;  }
expanding_stack(void)108   int  expanding_stack(void)              { return _expanding_stack;  }
109 
set_alt_sig_stack(address val)110   void set_alt_sig_stack(address val)     { _alt_sig_stack = val; }
alt_sig_stack(void)111   address alt_sig_stack(void)             { return _alt_sig_stack; }
112 
113 private:
114   Monitor* _startThread_lock;     // sync parent and child in thread creation
115 
116 public:
117 
118   Monitor* startThread_lock() const {
119     return _startThread_lock;
120   }
121 
122   // ***************************************************************
123   // Platform dependent initialization and cleanup
124   // ***************************************************************
125 
126 private:
127 
128   void pd_initialize();
129   void pd_destroy();
130 
131 // Reconciliation History
132 // osThread_solaris.hpp 1.24 99/08/27 13:11:54
133 // End
134 
135 #endif // OS_LINUX_VM_OSTHREAD_LINUX_HPP
136