1 /*
   2  * Copyright (c) 1999, 2012, 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_t  _thread_id;
  44   pthread_t _pthread_id;
  45 #else
  46   // _thread_id is kernel thread id (similar to LWP id on Solaris). Each
  47   // thread has a unique thread_id (BsdThreads or NPTL). It can be used
  48   // to access /proc.
  49   pid_t     _thread_id;
  50 
  51   // _pthread_id is the pthread id, which is used by library calls
  52   // (e.g. pthread_kill).
  53   pthread_t _pthread_id;
  54 #endif
  55 
  56   sigset_t _caller_sigmask; // Caller's signal mask
  57 
  58  public:
  59 
  60   // Methods to save/restore caller's signal mask
  61   sigset_t  caller_sigmask() const       { return _caller_sigmask; }
  62   void    set_caller_sigmask(sigset_t sigmask)  { _caller_sigmask = sigmask; }
  63 
  64 #ifdef _ALLBSD_SOURCE
  65   thread_t thread_id() const {
  66     return _thread_id;
  67   }
  68 #else
  69   pid_t thread_id() const {
  70     return _thread_id;
  71   }
  72 #endif
  73 #ifndef PRODUCT
  74   // Used for debugging, return a unique integer for each thread.
  75   intptr_t thread_identifier() const   { return (intptr_t)_pthread_id; }
  76 #endif
  77 #ifdef ASSERT
  78   // We expect no reposition failures so kill vm if we get one.
  79   //
  80   bool valid_reposition_failure() {
  81     return false;
  82   }
  83 #endif // ASSERT
  84 #ifdef _ALLBSD_SOURCE
  85   void set_thread_id(thread_t id) {
  86     _thread_id = id;
  87   }
  88 #else
  89   void set_thread_id(pid_t id) {
  90     _thread_id = id;
  91   }
  92 #endif
  93   pthread_t pthread_id() const {
  94     return _pthread_id;
  95   }
  96   void set_pthread_id(pthread_t tid) {
  97     _pthread_id = tid;
  98   }
  99 
 100   // ***************************************************************
 101   // suspension support.
 102   // ***************************************************************
 103 
 104 public:
 105   // flags that support signal based suspend/resume on Bsd are in a
 106   // separate class to avoid confusion with many flags in OSThread that
 107   // are used by VM level suspend/resume.
 108   os::Bsd::SuspendResume sr;
 109 
 110   // _ucontext and _siginfo are used by SR_handler() to save thread context,
 111   // and they will later be used to walk the stack or reposition thread PC.
 112   // If the thread is not suspended in SR_handler() (e.g. self suspend),
 113   // the value in _ucontext is meaningless, so we must use the last Java
 114   // frame information as the frame. This will mean that for threads
 115   // that are parked on a mutex the profiler (and safepoint mechanism)
 116   // will see the thread as if it were still in the Java frame. This
 117   // not a problem for the profiler since the Java frame is a close
 118   // enough result. For the safepoint mechanism when the give it the
 119   // Java frame we are not at a point where the safepoint needs the
 120   // frame to that accurate (like for a compiled safepoint) since we
 121   // should be in a place where we are native and will block ourselves
 122   // if we transition.
 123 private:
 124   void* _siginfo;
 125   ucontext_t* _ucontext;
 126   int _expanding_stack;                 /* non zero if manually expanding stack */
 127   address _alt_sig_stack;               /* address of base of alternate signal stack */
 128 
 129 public:
 130   void* siginfo() const                   { return _siginfo;  }
 131   void set_siginfo(void* ptr)             { _siginfo = ptr;   }
 132   ucontext_t* ucontext() const            { return _ucontext; }
 133   void set_ucontext(ucontext_t* ptr)      { _ucontext = ptr;  }
 134   void set_expanding_stack(void)          { _expanding_stack = 1;  }
 135   void clear_expanding_stack(void)        { _expanding_stack = 0;  }
 136   int  expanding_stack(void)              { return _expanding_stack;  }
 137 
 138   void set_alt_sig_stack(address val)     { _alt_sig_stack = val; }
 139   address alt_sig_stack(void)             { return _alt_sig_stack; }
 140 
 141 private:
 142   Monitor* _startThread_lock;     // sync parent and child in thread creation
 143 
 144 public:
 145 
 146   Monitor* startThread_lock() const {
 147     return _startThread_lock;
 148   }
 149 
 150   // ***************************************************************
 151   // Platform dependent initialization and cleanup
 152   // ***************************************************************
 153 
 154 private:
 155 
 156   void pd_initialize();
 157   void pd_destroy();
 158 
 159 // Reconciliation History
 160 // osThread_solaris.hpp 1.24 99/08/27 13:11:54
 161 // End
 162 
 163 #endif // OS_BSD_VM_OSTHREAD_BSD_HPP