/* Cancel a thread.
   Copyright (C) 2002-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library;  if not, see
   <https://www.gnu.org/licenses/>.  */

#include <pthread.h>
#include <hurd/signal.h>

#include <pt-internal.h>
#include <pthreadP.h>

static void
call_exit (void)
{
  __pthread_exit (0);
}

int
__pthread_do_cancel (struct __pthread *p)
{
  mach_port_t ktid;
  int me;

  assert (p->cancel_pending == 1);
  assert (p->cancel_state == PTHREAD_CANCEL_ENABLE);

  __pthread_mutex_unlock (&p->cancel_lock);

  ktid = __mach_thread_self ();
  me = p->kernel_thread == ktid;
  __mach_port_deallocate (__mach_task_self (), ktid);

  if (me)
    call_exit ();
  else
    {
      error_t err;
      struct hurd_sigstate *ss = _hurd_thread_sigstate (p->kernel_thread);

      __spin_lock (&ss->critical_section_lock);
      __spin_lock (&ss->lock);

      err = __thread_suspend (p->kernel_thread);
      assert_perror (err);

      __spin_unlock (&ss->lock);

      err = __thread_abort (p->kernel_thread);
      assert_perror (err);

      err = __thread_set_pcsptp (p->kernel_thread,
				 1, (void *) call_exit, 0, 0, 0, 0);
      assert_perror (err);

      err = __thread_resume (p->kernel_thread);
      assert_perror (err);

      _hurd_critical_section_unlock (ss);
    }

  return 0;
}