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

   1 #include "pthread_impl.h"
   2
   3 static struct pthread *main_thread = &(struct pthread){0};
   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         __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK,
  12                 SIGPT_SET, 0, _NSIG/8);
  13         if (__set_thread_area(TP_ADJ(main_thread)) < 0) return -1;
  14         main_thread->canceldisable = libc.canceldisable;
  15         main_thread->tsd = (void **)__pthread_tsd_main;
  16         main_thread->errno_ptr = __errno_location();
  17         main_thread->self = main_thread;
  18         main_thread->tid = main_thread->pid =
  19                 __syscall(SYS_set_tid_address, &main_thread->tid);
  20         if (!main_thread->dtv)
  21                 main_thread->dtv = (void *)dummy;
  22         libc.main_thread = main_thread;
  23         return 0;
  24 }
  25
  26 pthread_t __pthread_self_def()
  27 {
  28         static int init, failed;
  29         if (!init) {
  30                 if (failed) return 0;
  31                 if (init_main_thread() < 0) failed = 1;
  32                 if (failed) return 0;
  33                 init = 1;
  34         }
  35         return __pthread_self();
  36 }
  37
  38 weak_alias(__pthread_self_def, pthread_self);
  39 weak_alias(__pthread_self_def, __pthread_self_init);
  40
  41 void *__install_initial_tls(void *p)
  42 {
  43         main_thread = p;
  44         return __pthread_self_def();
  45 }