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

   1 #include "pthread_impl.h"
   2
   3 static struct pthread main_thread;
   4
   5 /* pthread_key_create.c overrides this */
   6 static const void *dummy[1] = { 0 };
   7 weak_alias(dummy, __pthread_tsd_main);
   8
   9 #undef errno
  10 static int *errno_location()
  11 {
  12         return __pthread_self()->errno_ptr;
  13 }
  14
  15 static int init_main_thread()
  16 {
  17         main_thread.tsd = (void **)__pthread_tsd_main;
  18         main_thread.self = &main_thread;
  19         if (__set_thread_area(&main_thread) < 0)
  20                 return -1;
  21         main_thread.errno_ptr = __errno_location();
  22         libc.errno_location = errno_location;
  23         main_thread.tid = main_thread.pid =
  24                 syscall(SYS_set_tid_address, &main_thread.tid);
  25         return 0;
  26 }
  27
  28 pthread_t pthread_self()
  29 {
  30         static int init, failed;
  31         if (!init) {
  32                 if (failed) return 0;
  33                 if (init_main_thread() < 0) failed = 1;
  34                 if (failed) return 0;
  35                 init = 1;
  36         }
  37         return __pthread_self();
  38 }