62 Threads receive different pid under LinuxThreads. We used to save the result of
  63 ::getpid() call in OSThread::_thread_id. This way uniqueness of OSThread::_thread_id
  64 was lost under NPTL. Now, we store the result of ::gettid() call in
  65 OSThread::_thread_id. Because gettid returns actual pid of thread (lwp id), this is
  66 unique again. We therefore use OSThread::_thread_id as unique identifier.
  67 
  68 3. There is a unique LWP id under both thread libraries. libthread_db  maps pthread_id
  69 to its underlying lwp_id under both the thread libraries. thread_info.lwp_id stores
  70 lwp_id of the thread. The lwp id is nothing but the actual pid of clone'd processes. But
  71 unfortunately libthread_db does not work very well for core dumps. So, we get pthread_id
  72 only for processes. For core dumps, we don't use libthread_db at all (like gdb).
  73 
  74 4. ptrace operates on this LWP id under both the thread libraries. When we say 'pid' for
  75 ptrace call, we refer to lwp_id of the thread.
  76 
  77 5. for core file, we parse ELF files and read data from them. For processes we  use
  78 combination of ptrace and /proc calls.
  79 
  80 *************************************************************************************/
  81 
  82 #ifdef ia64
  83 struct user_regs_struct {
  84 /* copied from user.h which doesn't define this in a struct */
  85 
  86 #define IA64_REG_COUNT (EF_SIZE/8+32)   /* integer and fp regs */
  87 unsigned long   regs[IA64_REG_COUNT];     /* integer and fp regs */
  88 };
  89 #endif
  90 
  91 #if defined(sparc)  || defined(sparcv9)
  92 #define user_regs_struct  pt_regs
  93 #endif
  94 
  95 // This C bool type must be int for compatibility with Linux calls and
  96 // it would be a mistake to equivalence it to C++ bool on many platforms
  97 
  98 typedef int bool;
  99 #define true  1
 100 #define false 0
 101 
 102 struct ps_prochandle;
 103 
 104 // attach to a process
 105 struct ps_prochandle* Pgrab(pid_t pid);
 106 
 107 // attach to a core dump
 108 struct ps_prochandle* Pgrab_core(const char* execfile, const char* corefile);
 109 
 110 // release a process or core

  62 Threads receive different pid under LinuxThreads. We used to save the result of
  63 ::getpid() call in OSThread::_thread_id. This way uniqueness of OSThread::_thread_id
  64 was lost under NPTL. Now, we store the result of ::gettid() call in
  65 OSThread::_thread_id. Because gettid returns actual pid of thread (lwp id), this is
  66 unique again. We therefore use OSThread::_thread_id as unique identifier.
  67 
  68 3. There is a unique LWP id under both thread libraries. libthread_db  maps pthread_id
  69 to its underlying lwp_id under both the thread libraries. thread_info.lwp_id stores
  70 lwp_id of the thread. The lwp id is nothing but the actual pid of clone'd processes. But
  71 unfortunately libthread_db does not work very well for core dumps. So, we get pthread_id
  72 only for processes. For core dumps, we don't use libthread_db at all (like gdb).
  73 
  74 4. ptrace operates on this LWP id under both the thread libraries. When we say 'pid' for
  75 ptrace call, we refer to lwp_id of the thread.
  76 
  77 5. for core file, we parse ELF files and read data from them. For processes we  use
  78 combination of ptrace and /proc calls.
  79 
  80 *************************************************************************************/
  81 



  82 





  83 #if defined(sparc)  || defined(sparcv9)
  84 #define user_regs_struct  pt_regs
  85 #endif
  86 
  87 // This C bool type must be int for compatibility with Linux calls and
  88 // it would be a mistake to equivalence it to C++ bool on many platforms
  89 
  90 typedef int bool;
  91 #define true  1
  92 #define false 0
  93 
  94 struct ps_prochandle;
  95 
  96 // attach to a process
  97 struct ps_prochandle* Pgrab(pid_t pid);
  98 
  99 // attach to a core dump
 100 struct ps_prochandle* Pgrab_core(const char* execfile, const char* corefile);
 101 
 102 // release a process or core