sysdeps/mach/hurd/htl/pt-docancel.c

   1 /* Cancel a thread.
   2    Copyright (C) 2002-2024 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 <hurd/signal.h>
  21
  22 #include <pt-internal.h>
  23 #include <pthreadP.h>
  24
  25 static void
  26 call_exit (void)
  27 {
  28   __pthread_exit (0);
  29 }
  30
  31 int
  32 __pthread_do_cancel (struct __pthread *p)
  33 {
  34   mach_port_t ktid;
  35   int me;
  36
  37   assert (p->cancel_pending == 1);
  38   assert (p->cancel_state == PTHREAD_CANCEL_ENABLE);
  39
  40   __pthread_mutex_unlock (&p->cancel_lock);
  41
  42   ktid = __mach_thread_self ();
  43   me = p->kernel_thread == ktid;
  44   __mach_port_deallocate (__mach_task_self (), ktid);
  45
  46   if (me)
  47     call_exit ();
  48   else
  49     {
  50       error_t err;
  51       struct hurd_sigstate *ss = _hurd_thread_sigstate (p->kernel_thread);
  52
  53       __spin_lock (&ss->critical_section_lock);
  54       __spin_lock (&ss->lock);
  55
  56       err = __thread_suspend (p->kernel_thread);
  57       assert_perror (err);
  58
  59       __spin_unlock (&ss->lock);
  60
  61       err = __thread_abort (p->kernel_thread);
  62       assert_perror (err);
  63
  64       err = __thread_set_pcsptp (p->kernel_thread,
  65                                  1, (void *) call_exit, 0, 0, 0, 0);
  66       assert_perror (err);
  67
  68       err = __thread_resume (p->kernel_thread);
  69       assert_perror (err);
  70
  71       _hurd_critical_section_unlock (ss);
  72     }
  73
  74   return 0;
  75 }