每个进程所有pthread_internal_t结构是用g_thread_list链起来的。因此可以通过这个静态变量来查找想要的pthread_internal_t，如：

(gdb) p  g_thread_list$87 = (pthread_internal_t *) 0x7f6a51a450(gdb) p *g_thread_list$88 = {  next = 0x7f69bc6450,   prev = 0x0,   tid = 31561,   cached_pid_ = 1448,   attr = {    flags = 1,     stack_base = 0x7f6a41e000,     stack_size = 1033296,     guard_size = 4096,     sched_policy = 0,     sched_priority = 0,     __reserved = " REf\177\000\000\000\020\020\253k\177\000\000"  },   join_state = THREAD_DETACHED,   cleanup_stack = 0x0,   start_routine = 0x7f97147cd0 
     
      ,   start_routine_arg = 0x7f66455260,   return_value = 0x0,   alternate_signal_stack = 0x0,   startup_handshake_lock = {    state = Lock::Unlocked,     process_shared = false  },   mmap_size = 1036288,   thread_local_dtors = 0x0,   tls = {0x7f6a51a4e8, 0x7f6a51a450, 0x0, 0x0, 0x0, 0x2212c0df7ebda00b, 0x0, 0x0, 0x0},   key_data = {
   {      seq = 0,       data = 0x0    } 
      
       },   dlerror_buffer = '\000' 
       
        }
       
      
     

(gdb) p *(pthread_internal_t *)0x7f69bc6450$91 = {  next = 0x7f6b695450,   prev = 0x7f6a51a450,   tid = 30974,   cached_pid_ = 1448,   attr = {    flags = 1,     stack_base = 0x7f69aca000,     stack_size = 1033296,     guard_size = 4096,     sched_policy = 0,     sched_priority = 0,     __reserved = "\v\240\275~\337\300\022\"\310\362O\222\177\000\000"  },   join_state = THREAD_DETACHED,   cleanup_stack = 0x0,   start_routine = 0x7f943ca7b4 <__timer_thread_start(void*)>,   start_routine_arg = 0x7f75b694f0,   return_value = 0x0,   alternate_signal_stack = 0x7f6e6c1000,   startup_handshake_lock = {    state = Lock::LockedWithoutWaiter,     process_shared = false  },   mmap_size = 1036288,   thread_local_dtors = 0x0,   tls = {0x7f69bc64e8, 0x7f69bc6450, 0x0, 0x0, 0x0, 0x2212c0df7ebda00b, 0x0, 0x0, 0x0},   key_data = {
   {      seq = 0,       data = 0x0    } 
     
      },   dlerror_buffer = '\000' 
      
       }
      
     

pthread_internal_t中有很多有用的数据可供我们分析和调试问题。

如果需要通过tid或者栈指针获取对应的pthread_internal_t，可以用以下脚本实现：

define print_thread_by_tid    set $tid = $arg0    set $pThread = g_thread_list    while $pThread != 0          if $pThread->tid == $tid             p $pThread             p *$pThread             loop_break         end          set $pThread = $pThread->next    endenddefine print_thread_by_sp    set $cursp = $arg0    set $pThread = g_thread_list        while $pThread != 0       if $pThread->attr.stack_base <= $cursp && $pThread->attr.stack_base + $pThread->attr.stack_size >= $cursp           p $pThread           p *$pThread           loop_break       end        set $pThread = $pThread->next    endend

如果要找当前线程的pthread_internal_t，则可以利用当前的sp，如：

define print_current_thread    print_thread_by_sp $spend

运行结果：

(gdb) print_current_thread $92 = (pthread_internal_t *) 0x7f6b466450$93 = {  next = 0x7f6987a450,   prev = 0x7f6ad59450,   tid = 2047,   cached_pid_ = 1448,   attr = {    flags = 1,     stack_base = 0x7f6b36a000,     stack_size = 1033296,     guard_size = 4096,     sched_policy = 0,     sched_priority = 0,     __reserved = "\200\025\324u\177\000\000\000@\373\212\311\177\000\000"  },   join_state = THREAD_DETACHED,   cleanup_stack = 0x0,   start_routine = 0x7f97147cd0 
     
      ,   start_routine_arg = 0x7f75d415a0,   return_value = 0x0,   alternate_signal_stack = 0x7f721be000,   startup_handshake_lock = {    state = Lock::LockedWithoutWaiter,     process_shared = false  },   mmap_size = 1036288,   thread_local_dtors = 0x0,   tls = {0x7f6b4664e8, 0x7f6b466450, 0x0, 0x7f954ad7f0 
      
       , 0x0, 0x2212c0df7ebda00b, 0x0, 0x7f76239200, 0x0},   key_data = {
   {      seq = 1,       data = 0x7f75d40080    }, {      seq = 0,       data = 0x0    }, {      seq = 0,       data = 0x0    }, {      seq = 0,       data = 0x0    }, {      seq = 0,       data = 0x0    }, {      seq = 0,       data = 0x0    }, {      seq = 0,       data = 0x0    }, {      seq = 0,       data = 0x0    }, {      seq = 0,       data = 0x0    }, {      seq = 0,       data = 0x0    }, {      seq = 0,       data = 0x0    }, {      seq = 1,       data = 0x7f86abe180    }, {      seq = 0,       data = 0x0    }, {      seq = 0,       data = 0x0    }, {      seq = 0,       data = 0x0    }, {      seq = 0,       data = 0x0    }, {      seq = 1,       data = 0x7f76018010    }, {      seq = 1,       data = 0x7f75d42fa0    }, {      seq = 1,       data = 0x7f75d9dc00    }, {      seq = 0,       data = 0x0    }, {      seq = 1,       data = 0x7f67be29a0    }, {      seq = 1,       data = 0x7f67917c50    }, {      seq = 0,       data = 0x0    } 
       
        },   dlerror_buffer = '\000' 
        
         }