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 static int init_main_thread()
  10 {
  11         if (__set_thread_area(&main_thread) < 0) return -1;
  12         main_thread.canceldisable = libc.canceldisable;
  13         main_thread.tsd = (void **)__pthread_tsd_main;
  14         main_thread.errno_ptr = __errno_location();
  15         main_thread.self = &main_thread;
  16         main_thread.tid = main_thread.pid =
  17                 __syscall(SYS_set_tid_address, &main_thread.tid);
  18         libc.main_thread = &main_thread;
  19         return 0;
  20 }
  21
  22 pthread_t pthread_self()
  23 {
  24         static int init, failed;
  25         if (!init) {
  26                 if (failed) return 0;
  27                 if (init_main_thread() < 0) failed = 1;
  28                 if (failed) return 0;
  29                 init = 1;
  30         }
  31         return __pthread_self();
  32 }
  33
  34 weak_alias(pthread_self, __pthread_self_init);