sysdeps/nacl/createthread.c

   1 /* Low-level thread creation for NPTL.  NaCl version.
   2    Copyright (C) 2015 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 #include <nacl-interfaces.h>
  20 #include <pthread-pids.h>
  21
  22 /* See the comments in pthread_create.c for the requirements for these
  23    two macros and the create_thread function.  */
  24
  25 #define START_THREAD_DEFN \
  26   static void __attribute__ ((noreturn)) start_thread (void)
  27 #define START_THREAD_SELF THREAD_SELF
  28
  29 /* pthread_create.c defines this using START_THREAD_DEFN
  30    We need a forward declaration here so we can take its address.  */
  31 static void start_thread (void) __attribute__ ((noreturn));
  32
  33 static int
  34 create_thread (struct pthread *pd, const struct pthread_attr *attr,
  35                bool stopped_start, STACK_VARIABLES_PARMS, bool *thread_ran)
  36 {
  37   pd->tid = __nacl_get_tid (pd);
  38
  39   pd->stopped_start = stopped_start;
  40   if (__glibc_unlikely (stopped_start))
  41     /* We make sure the thread does not run far by forcing it to get a
  42        lock.  We lock it here too so that the new thread cannot continue
  43        until we tell it to.  */
  44     lll_lock (pd->lock, LLL_PRIVATE);
  45
  46   TLS_DEFINE_INIT_TP (tp, pd);
  47
  48   return __nacl_irt_thread.thread_create (&start_thread, stackaddr, tp);
  49 }