1 /*
   2  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef OS_BSD_VM_OSTHREAD_BSD_HPP
  26 #define OS_BSD_VM_OSTHREAD_BSD_HPP
  27 
  28  private:
  29   int _thread_type;
  30 
  31  public:
  32 
  33   int thread_type() const {
  34     return _thread_type;
  35   }
  36   void set_thread_type(int type) {
  37     _thread_type = type;
  38   }
  39 
  40  private:
  41 
  42 #ifdef _ALLBSD_SOURCE
  43   // _thread_id and _pthread_id are the same on BSD
  44   // keep both to minimize code divergence in os_bsd.cpp
  45   pthread_t _thread_id;
  46   pthread_t _pthread_id;
  47 #else
  48   // _thread_id is kernel thread id (similar to LWP id on Solaris). Each
  49   // thread has a unique thread_id (BsdThreads or NPTL). It can be used
  50   // to access /proc.
  51   pid_t     _thread_id;
  52 
  53   // _pthread_id is the pthread id, which is used by library calls
  54   // (e.g. pthread_kill).
  55   pthread_t _pthread_id;
  56 #endif
  57 
  58   sigset_t _caller_sigmask; // Caller's signal mask
  59 
  60  public:
  61 
  62   // Methods to save/restore caller's signal mask
  63   sigset_t  caller_sigmask() const       { return _caller_sigmask; }
  64   void    set_caller_sigmask(sigset_t sigmask)  { _caller_sigmask = sigmask; }
  65 
  66 #ifdef _ALLBSD_SOURCE
  67   pthread_t thread_id() const {
  68     return _thread_id;
  69   }
  70 #else
  71   pid_t thread_id() const {
  72     return _thread_id;
  73   }
  74 #endif
  75 #ifndef PRODUCT
  76   // Used for debugging, return a unique integer for each thread.
  77   intptr_t thread_identifier() const   { return (intptr_t)_pthread_id; }
  78 #endif
  79 #ifdef ASSERT
  80   // We expect no reposition failures so kill vm if we get one.
  81   //
  82   bool valid_reposition_failure() {
  83     return false;
  84   }
  85 #endif // ASSERT
  86 #ifdef _ALLBSD_SOURCE
  87   void set_thread_id(pthread_t id) {
  88     _thread_id = id;
  89   }
  90 #else
  91   void set_thread_id(pid_t id) {
  92     _thread_id = id;
  93   }
  94 #endif
  95   pthread_t pthread_id() const {
  96     return _pthread_id;
  97   }
  98   void set_pthread_id(pthread_t tid) {
  99     _pthread_id = tid;
 100   }
 101 
 102   // ***************************************************************
 103   // suspension support.
 104   // ***************************************************************
 105 
 106 public:
 107   // flags that support signal based suspend/resume on Bsd are in a
 108   // separate class to avoid confusion with many flags in OSThread that
 109   // are used by VM level suspend/resume.
 110   os::Bsd::SuspendResume sr;
 111 
 112   // _ucontext and _siginfo are used by SR_handler() to save thread context,
 113   // and they will later be used to walk the stack or reposition thread PC.
 114   // If the thread is not suspended in SR_handler() (e.g. self suspend),
 115   // the value in _ucontext is meaningless, so we must use the last Java
 116   // frame information as the frame. This will mean that for threads
 117   // that are parked on a mutex the profiler (and safepoint mechanism)
 118   // will see the thread as if it were still in the Java frame. This
 119   // not a problem for the profiler since the Java frame is a close
 120   // enough result. For the safepoint mechanism when the give it the
 121   // Java frame we are not at a point where the safepoint needs the
 122   // frame to that accurate (like for a compiled safepoint) since we
 123   // should be in a place where we are native and will block ourselves
 124   // if we transition.
 125 private:
 126   void* _siginfo;
 127   ucontext_t* _ucontext;
 128   int _expanding_stack;                 /* non zero if manually expanding stack */
 129   address _alt_sig_stack;               /* address of base of alternate signal stack */
 130 
 131 public:
 132   void* siginfo() const                   { return _siginfo;  }
 133   void set_siginfo(void* ptr)             { _siginfo = ptr;   }
 134   ucontext_t* ucontext() const            { return _ucontext; }
 135   void set_ucontext(ucontext_t* ptr)      { _ucontext = ptr;  }
 136   void set_expanding_stack(void)          { _expanding_stack = 1;  }
 137   void clear_expanding_stack(void)        { _expanding_stack = 0;  }
 138   int  expanding_stack(void)              { return _expanding_stack;  }
 139 
 140   void set_alt_sig_stack(address val)     { _alt_sig_stack = val; }
 141   address alt_sig_stack(void)             { return _alt_sig_stack; }
 142 
 143 private:
 144   Monitor* _startThread_lock;     // sync parent and child in thread creation
 145 
 146 public:
 147 
 148   Monitor* startThread_lock() const {
 149     return _startThread_lock;
 150   }
 151 
 152   // ***************************************************************
 153   // Platform dependent initialization and cleanup
 154   // ***************************************************************
 155 
 156 private:
 157 
 158   void pd_initialize();
 159   void pd_destroy();
 160 
 161 // Reconciliation History
 162 // osThread_solaris.hpp 1.24 99/08/27 13:11:54
 163 // End
 164 
 165 #endif // OS_BSD_VM_OSTHREAD_BSD_HPP