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 *errno_location()
  10 {
  11         return __pthread_self()->errno_ptr;
  12 }
  13
  14 static int init_main_thread()
  15 {
  16         if (__set_thread_area(&main_thread) < 0) return -1;
  17         main_thread.canceldisable = libc.canceldisable;
  18         main_thread.tsd = (void **)__pthread_tsd_main;
  19         main_thread.self = libc.main_thread = &main_thread;
  20         main_thread.errno_ptr = __errno_location();
  21         libc.errno_location = errno_location;
  22         main_thread.tid = main_thread.pid =
  23                 __syscall(SYS_set_tid_address, &main_thread.tid);
  24         return 0;
  25 }
  26
  27 pthread_t pthread_self()
  28 {
  29         static int init, failed;
  30         if (!init) {
  31                 if (failed) return 0;
  32                 if (init_main_thread() < 0) failed = 1;
  33                 if (failed) return 0;
  34                 init = 1;
  35         }
  36         return __pthread_self();
  37 }