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

   1 /*
   2  * pthread_barrier_attr_setpshared.c
   3  *
   4  * Description:
   5  * This translation unit implements barrier primitives.
   6  *
   7  * --------------------------------------------------------------------------
   8  *
   9  *      Pthreads-win32 - POSIX Threads Library for Win32
  10  *      Copyright(C) 1998 John E. Bossom
  11  *      Copyright(C) 1999,2005 Pthreads-win32 contributors
  12  *
  13  *      Contact Email: rpj@callisto.canberra.edu.au
  14  *
  15  *      The current list of contributors is contained
  16  *      in the file CONTRIBUTORS included with the source
  17  *      code distribution. The list can also be seen at the
  18  *      following World Wide Web location:
  19  *      http://sources.redhat.com/pthreads-win32/contributors.html
  20  *
  21  *      This library is free software; you can redistribute it and/or
  22  *      modify it under the terms of the GNU Lesser General Public
  23  *      License as published by the Free Software Foundation; either
  24  *      version 2 of the License, or (at your option) any later version.
  25  *
  26  *      This library is distributed in the hope that it will be useful,
  27  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  28  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  29  *      Lesser General Public License for more details.
  30  *
  31  *      You should have received a copy of the GNU Lesser General Public
  32  *      License along with this library in the file COPYING.LIB;
  33  *      if not, write to the Free Software Foundation, Inc.,
  34  *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  35  */
  36
  37 #include "pthread.h"
  38 #include "implement.h"
  39
  40
  41 int
  42 pthread_barrierattr_setpshared (pthread_barrierattr_t * attr, int pshared)
  43      /*
  44       * ------------------------------------------------------
  45       * DOCPUBLIC
  46       *      Barriers created with 'attr' can be shared between
  47       *      processes if pthread_barrier_t variable is allocated
  48       *      in memory shared by these processes.
  49       *
  50       * PARAMETERS
  51       *      attr
  52       *              pointer to an instance of pthread_barrierattr_t
  53       *
  54       *      pshared
  55       *              must be 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       * DESCRIPTION
  64       *      Mutexes creatd with 'attr' can be shared between
  65       *      processes if pthread_barrier_t variable is allocated
  66       *      in memory shared by these processes.
  67       *
  68       *      NOTES:
  69       *              1)      pshared barriers MUST be allocated in shared
  70       *                      memory.
  71       *
  72       *              2)      The following macro is defined if shared barriers
  73       *                      are supported:
  74       *                              _POSIX_THREAD_PROCESS_SHARED
  75       *
  76       * RESULTS
  77       *              0               successfully set attribute,
  78       *              EINVAL          'attr' or pshared is invalid,
  79       *              ENOSYS          PTHREAD_PROCESS_SHARED not supported,
  80       *
  81       * ------------------------------------------------------
  82       */
  83 {
  84   int result;
  85
  86   if ((attr != NULL && *attr != NULL) &&
  87       ((pshared == PTHREAD_PROCESS_SHARED) ||
  88        (pshared == PTHREAD_PROCESS_PRIVATE)))
  89     {
  90       if (pshared == PTHREAD_PROCESS_SHARED)
  91         {
  92
  93 #if !defined( _POSIX_THREAD_PROCESS_SHARED )
  94
  95           result = ENOSYS;
  96           pshared = PTHREAD_PROCESS_PRIVATE;
  97
  98 #else
  99
 100           result = 0;
 101
 102 #endif /* _POSIX_THREAD_PROCESS_SHARED */
 103
 104         }
 105       else
 106         {
 107           result = 0;
 108         }
 109
 110       (*attr)->pshared = pshared;
 111     }
 112   else
 113     {
 114       result = EINVAL;
 115     }
 116
 117   return (result);
 118
 119 }                               /* pthread_barrierattr_setpshared */