nptl/createthread.c

   1 /* Low-level thread creation for NPTL.  Stub version.
   2    Copyright (C) 2014-2019 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    <http://www.gnu.org/licenses/>.  */
  18
  19 /* See the comments in pthread_create.c for the requirements for these
  20    two macros and the create_thread function.  */
  21
  22 #define START_THREAD_DEFN \
  23   static void __attribute__ ((noreturn)) start_thread (void)
  24 #define START_THREAD_SELF THREAD_SELF
  25
  26 static int
  27 create_thread (struct pthread *pd, const struct pthread_attr *attr,
  28                bool *stopped_start, STACK_VARIABLES_PARMS, bool *thread_ran)
  29 {
  30   /* If the implementation needs to do some tweaks to the thread after
  31      it has been created at the OS level, it can set STOPPED_START here.  */
  32
  33   pd->stopped_start = *stopped_start;
  34   if (__glibc_unlikely (*stopped_start))
  35     /* See CONCURRENCY NOTES in nptl/pthread_create.c.  */
  36     lll_lock (pd->lock, LLL_PRIVATE);
  37
  38   return ENOSYS;
  39
  40   /* It's started now, so if we fail below, we'll have to cancel it
  41      and let it clean itself up.  */
  42   *thread_ran = true;
  43
  44   return 0;
  45 }