nptl/pthread_attr_copy.c

   1 /* Deep copy of a pthread_attr_t object.
   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 <errno.h>
  20 #include <pthreadP.h>
  21 #include <stdlib.h>
  22
  23 int
  24 __pthread_attr_copy (pthread_attr_t *target, const pthread_attr_t *source)
  25 {
  26   /* Avoid overwriting *TARGET until all allocations have
  27      succeeded.  */
  28   union pthread_attr_transparent temp;
  29   temp.external = *source;
  30
  31   /* Force new allocation.  This function has full ownership of temp.  */
  32   temp.internal.extension = NULL;
  33
  34   int ret = 0;
  35
  36   struct pthread_attr *isource = (struct pthread_attr *) source;
  37
  38   if (isource->extension != NULL)
  39     {
  40       /* Propagate affinity mask information.  */
  41       if (isource->extension->cpusetsize > 0)
  42         ret = __pthread_attr_setaffinity_np (&temp.external,
  43                                              isource->extension->cpusetsize,
  44                                              isource->extension->cpuset);
  45
  46       /* Propagate the signal mask information.  */
  47       if (ret == 0 && isource->extension->sigmask_set)
  48         ret = __pthread_attr_setsigmask_internal ((pthread_attr_t *) &temp,
  49                                                   &isource->extension->sigmask);
  50     }
  51
  52   if (ret != 0)
  53     {
  54       /* Deallocate because we have ownership.  */
  55       __pthread_attr_destroy (&temp.external);
  56       return ret;
  57     }
  58
  59   /* Transfer ownership.  *target is not assumed to have been
  60      initialized.  */
  61   *target = temp.external;
  62   return 0;
  63 }
  64 libc_hidden_def (__pthread_attr_copy)