KDBG/KDThreadMapEntry.hpp

   1 //
   2 //  KDThreadMapEntry.hpp
   3 //  KDBG
   4 //
   5 //  Created by James McIlree on 10/25/12.
   6 //  Copyright (c) 2014 Apple. All rights reserved.
   7 //
   8
   9 #ifndef kdprof_KDThreadMapEntry_hpp
  10 #define kdprof_KDThreadMapEntry_hpp
  11
  12 //
  13 // This is the kd_threadmap from the kernel
  14 //
  15 // There is one interesting conflict I have noticed so far.
  16 //
  17 // The _pid field is set to 1 for kernel threads that have no user space
  18 // representation. However, 1 is a valid pid, and in fact, used by launchd.
  19 //
  20 // A full disambiguation of entries *must* include the tid, pid, AND name:
  21 //
  22 //    000000000000011f 00000001 launchd
  23 //    000000000000014f 00000001 launchd
  24 //    0000000000000150 00000001 launchd
  25 //
  26 //    0000000000000110 00000001 kernel_task
  27 //    0000000000000120 00000001 kernel_task
  28 //    0000000000000133 00000001 kernel_task
  29 //
  30 template <typename SIZE>
  31 class KDThreadMapEntry {
  32   protected:
  33     typename SIZE::ptr_t        _tid;
  34     int32_t                     _pid;
  35     char                        _name[20]; // This is process name, not thread name!
  36
  37   public:
  38     typename SIZE::ptr_t tid() const            { return _tid; }
  39     int32_t pid() const                         { return _pid; }
  40     const char* name() const                    { return _name; }
  41 };
  42
  43 #endif