1  /* Cancel a thread.
       2     Copyright (C) 2002-2023 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  }