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_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   }
  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; }
  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.
  56   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   //
  61   bool valid_reposition_failure() {
  62     return false;
  63   }
  64 #endif // ASSERT
  65   pthread_t pthread_id() const {
  66     return _pthread_id;
  67   }
  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::Linux::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;  }
 103   void set_siginfo(void* ptr)             { _siginfo = ptr;   }
 104   ucontext_t* ucontext() const            { return _ucontext; }
 105   void set_ucontext(ucontext_t* ptr)      { _ucontext = ptr;  }
 106   void set_expanding_stack(void)          { _expanding_stack = 1;  }
 107   void clear_expanding_stack(void)        { _expanding_stack = 0;  }
 108   int  expanding_stack(void)              { return _expanding_stack;  }
 109 
 110   void set_alt_sig_stack(address val)     { _alt_sig_stack = val; }
 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