nptl/pthread_mutexattr_getpshared.c

   1 /* Copyright (C) 2002 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <pthreadP.h>
  21
  22
  23 int
  24 pthread_mutexattr_getpshared (attr, pshared)
  25      const pthread_mutexattr_t *attr;
  26      int *pshared;
  27 {
  28   const struct pthread_mutexattr *iattr;
  29
  30   iattr = (const struct pthread_mutexattr *) attr;
  31
  32   /* We use bit 31 to signal whether the mutex is going to be
  33      process-shared or not.  */
  34   *pshared = ((iattr->mutexkind & 0x80000000) != 0
  35               ? PTHREAD_PROCESS_SHARED : PTHREAD_PROCESS_PRIVATE);
  36
  37   return 0;
  38 }