1  /* Set the cancel type during blocking calls.
       2     Copyright (C) 2020-2023 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 <pthreadP.h>
      21  #include <pt-internal.h>
      22  
      23  int __pthread_enable_asynccancel (void)
      24  {
      25    struct __pthread *p = _pthread_self ();
      26    int oldtype;
      27  
      28    if (___pthread_self == NULL)
      29      /* We are not initialized yet, we can't be cancelled anyway.  */
      30      return PTHREAD_CANCEL_DEFERRED;
      31  
      32    __pthread_mutex_lock (&p->cancel_lock);
      33    oldtype = p->cancel_type;
      34    p->cancel_type = PTHREAD_CANCEL_ASYNCHRONOUS;
      35    __pthread_mutex_unlock (&p->cancel_lock);
      36  
      37    __pthread_testcancel ();
      38  
      39    return oldtype;
      40  }
      41  
      42  void __pthread_disable_asynccancel (int oldtype)
      43  {
      44    struct __pthread *p = _pthread_self ();
      45  
      46    if (___pthread_self == NULL)
      47      /* We are not initialized yet, we can't be cancelled anyway.  */
      48      return;
      49  
      50    __pthread_mutex_lock (&p->cancel_lock);
      51    p->cancel_type = oldtype;
      52    __pthread_mutex_unlock (&p->cancel_lock);
      53  }