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.canceldisable = libc.canceldisable;
  18         main_thread.tsd = (void **)__pthread_tsd_main;
  19         main_thread.self = &main_thread;
  20         if (__set_thread_area(&main_thread) < 0)
  21                 return -1;
  22         main_thread.errno_ptr = __errno_location();
  23         libc.errno_location = errno_location;
  24         main_thread.tid = main_thread.pid =
  25                 syscall(SYS_set_tid_address, &main_thread.tid);
  26         return 0;
  27 }
  28
  29 pthread_t pthread_self()
  30 {
  31         static int init, failed;
  32         if (!init) {
  33                 if (failed) return 0;
  34                 if (init_main_thread() < 0) failed = 1;
  35                 if (failed) return 0;
  36                 init = 1;
  37         }
  38         return __pthread_self();
  39 }