1  /* Get calling thread's ID.
       2     Copyright (C) 2000-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library;  if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <pthread.h>
      20  #include <shlib-compat.h>
      21  #include <pt-internal.h>
      22  
      23  /* Return the thread ID of the calling thread.  */
      24  pthread_t
      25  __pthread_self (void)
      26  {
      27    struct __pthread *self;
      28  
      29    if (___pthread_self == NULL)
      30      /* We are not initialized yet, we are the first thread.  */
      31      return 1;
      32  
      33    self = _pthread_self ();
      34    assert (self != NULL);
      35  
      36    return self->thread;
      37  }
      38  
      39  libc_hidden_def (__pthread_self)
      40  versioned_symbol (libc, __pthread_self, pthread_self, GLIBC_2_21);
      41  
      42  #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_12, GLIBC_2_21)
      43  compat_symbol (libc, __pthread_self, pthread_self, GLIBC_2_12);
      44  #endif