htl/cancellation.c

   1 /* Set the cancel type during blocking calls.
   2    Copyright (C) 2020-2022 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 }