nsz Git - musl/blob - src/thread/pthread_self.c

   1 #include "pthread_impl.h"
   2
   3 static struct pthread main_thread;
   4
   5 #undef errno
   6 static int *errno_location()
   7 {
   8         return __pthread_self()->errno_ptr;
   9 }
  10
  11 static int init_main_thread()
  12 {
  13         main_thread.self = &main_thread;
  14         if (__set_thread_area(&main_thread) < 0)
  15                 return -1;
  16         syscall1(__NR_set_tid_address, (long)&main_thread.tid);
  17         main_thread.errno_ptr = __errno_location();
  18         libc.errno_location = errno_location;
  19         main_thread.tid = main_thread.pid = getpid();
  20         return 0;
  21 }
  22
  23 pthread_t pthread_self()
  24 {
  25         static int init, failed;
  26         if (!init) {
  27                 if (failed) return 0;
  28                 if (init_main_thread() < 0) failed = 1;
  29                 if (failed) return 0;
  30                 init = 1;
  31         }
  32         return __pthread_self();
  33 }