sysdeps/mach/hurd/htl/pt-sigstate-init.c

   1 /* Initialize the signal state.  Hurd on Mach version.
   2    Copyright (C) 2002-2019 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    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <pthread.h>
  20 #include <pt-internal.h>
  21 #include <hurd/signal.h>
  22
  23 error_t
  24 __pthread_sigstate_init (struct __pthread *thread)
  25 {
  26   static int do_init_global;
  27
  28   /* Mark the thread as a global signal receiver so as to conform with
  29      the pthread semantics.  However, we must be careful.  The first
  30      pthread created is the main thread, during libpthread initialization.
  31      We must not mark it, otherwise the sigprocmask call in
  32      __pthread_create would try to access _hurd_global_sigstate,
  33      which is not initialized yet.  When glibc runs _hurdsig_init later
  34      on, the message thread is created, which must not be marked either.  */
  35   if (do_init_global)
  36     {
  37       struct hurd_sigstate *ss = _hurd_thread_sigstate (thread->kernel_thread);
  38       (void) ss;
  39     }
  40   else if (__pthread_num_threads >= 2)
  41     do_init_global = 1;
  42
  43   return 0;
  44 }