nptl/createthread.c

   1 /* Low-level thread creation for NPTL.  Stub version.
   2    Copyright (C) 2014-2016 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     /* We make sure the thread does not run far by forcing it to get a
  36        lock.  We lock it here too so that the new thread cannot continue
  37        until we tell it to.  */
  38     lll_lock (pd->lock, LLL_PRIVATE);
  39
  40   return ENOSYS;
  41
  42   /* It's started now, so if we fail below, we'll have to cancel it
  43      and let it clean itself up.  */
  44   *thread_ran = true;
  45
  46   return 0;
  47 }