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

   1 /*
   2  * pthread_condattr_setpshared.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_setpshared (pthread_condattr_t * attr, int pshared)
  44      /*
  45       * ------------------------------------------------------
  46       * DOCPUBLIC
  47       *      Mutexes created with 'attr' can be shared between
  48       *      processes if pthread_mutex_t variable is allocated
  49       *      in memory shared by these processes.
  50       *
  51       * PARAMETERS
  52       *      attr
  53       *              pointer to an instance of pthread_mutexattr_t
  54       *
  55       *      pshared
  56       *              must be one of:
  57       *
  58       *                      PTHREAD_PROCESS_SHARED
  59       *                              May be shared if in shared memory
  60       *
  61       *                      PTHREAD_PROCESS_PRIVATE
  62       *                              Cannot be shared.
  63       *
  64       * DESCRIPTION
  65       *      Mutexes creatd with 'attr' can be shared between
  66       *      processes if pthread_mutex_t variable is allocated
  67       *      in memory shared by these processes.
  68       *
  69       *      NOTES:
  70       *              1)      pshared mutexes MUST be allocated in shared
  71       *                      memory.
  72       *
  73       *              2)      The following macro is defined if shared mutexes
  74       *                      are supported:
  75       *                              _POSIX_THREAD_PROCESS_SHARED
  76       *
  77       * RESULTS
  78       *              0               successfully set attribute,
  79       *              EINVAL          'attr' or pshared is invalid,
  80       *              ENOSYS          PTHREAD_PROCESS_SHARED not supported,
  81       *
  82       * ------------------------------------------------------
  83       */
  84 {
  85   int result;
  86
  87   if ((attr != NULL && *attr != NULL)
  88       && ((pshared == PTHREAD_PROCESS_SHARED)
  89           || (pshared == PTHREAD_PROCESS_PRIVATE)))
  90     {
  91       if (pshared == PTHREAD_PROCESS_SHARED)
  92         {
  93
  94 #if !defined( _POSIX_THREAD_PROCESS_SHARED )
  95           result = ENOSYS;
  96           pshared = PTHREAD_PROCESS_PRIVATE;
  97 #else
  98           result = 0;
  99
 100 #endif /* _POSIX_THREAD_PROCESS_SHARED */
 101
 102         }
 103       else
 104         {
 105           result = 0;
 106         }
 107
 108       (*attr)->pshared = pshared;
 109     }
 110   else
 111     {
 112       result = EINVAL;
 113     }
 114
 115   return result;
 116
 117 }                               /* pthread_condattr_setpshared */