native_client_sdk/src/libraries/third_party/pthreads-win32/pthread_condattr_getpshared.c

   1 /*
   2  * pthread_condattr_getpshared.c
   3  *
   4  * Description:
   5  * This translation unit implements condition variables and their primitives.
   6  *
   7  *
   8  * --------------------------------------------------------------------------
   9  *
  10  *      Pthreads-win32 - POSIX Threads Library for Win32
  11  *      Copyright(C) 1998 John E. Bossom
  12  *      Copyright(C) 1999,2005 Pthreads-win32 contributors
  13  *
  14  *      Contact Email: rpj@callisto.canberra.edu.au
  15  *
  16  *      The current list of contributors is contained
  17  *      in the file CONTRIBUTORS included with the source
  18  *      code distribution. The list can also be seen at the
  19  *      following World Wide Web location:
  20  *      http://sources.redhat.com/pthreads-win32/contributors.html
  21  *
  22  *      This library is free software; you can redistribute it and/or
  23  *      modify it under the terms of the GNU Lesser General Public
  24  *      License as published by the Free Software Foundation; either
  25  *      version 2 of the License, or (at your option) any later version.
  26  *
  27  *      This library is distributed in the hope that it will be useful,
  28  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  29  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  30  *      Lesser General Public License for more details.
  31  *
  32  *      You should have received a copy of the GNU Lesser General Public
  33  *      License along with this library in the file COPYING.LIB;
  34  *      if not, write to the Free Software Foundation, Inc.,
  35  *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  36  */
  37
  38 #include "pthread.h"
  39 #include "implement.h"
  40
  41
  42 int
  43 pthread_condattr_getpshared (const pthread_condattr_t * attr, int *pshared)
  44      /*
  45       * ------------------------------------------------------
  46       * DOCPUBLIC
  47       *      Determine whether condition variables created with 'attr'
  48       *      can be shared between processes.
  49       *
  50       * PARAMETERS
  51       *      attr
  52       *              pointer to an instance of pthread_condattr_t
  53       *
  54       *      pshared
  55       *              will be set to one of:
  56       *
  57       *                      PTHREAD_PROCESS_SHARED
  58       *                              May be shared if in shared memory
  59       *
  60       *                      PTHREAD_PROCESS_PRIVATE
  61       *                              Cannot be shared.
  62       *
  63       *
  64       * DESCRIPTION
  65       *      Condition Variables created with 'attr' can be shared
  66       *      between processes if pthread_cond_t variable is allocated
  67       *      in memory shared by these processes.
  68       *      NOTES:
  69       *      1)      pshared condition variables MUST be allocated in
  70       *              shared memory.
  71       *
  72       *      2)      The following macro is defined if shared mutexes
  73       *              are supported:
  74       *                      _POSIX_THREAD_PROCESS_SHARED
  75       *
  76       * RESULTS
  77       *              0               successfully retrieved attribute,
  78       *              EINVAL          'attr' or 'pshared' is invalid,
  79       *
  80       * ------------------------------------------------------
  81       */
  82 {
  83   int result;
  84
  85   if ((attr != NULL && *attr != NULL) && (pshared != NULL))
  86     {
  87       *pshared = (*attr)->pshared;
  88       result = 0;
  89     }
  90   else
  91     {
  92       result = EINVAL;
  93     }
  94
  95   return result;
  96
  97 }                               /* pthread_condattr_getpshared */