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

   1 /*
   2  * pthread_attr_init.c
   3  *
   4  * Description:
   5  * This translation unit implements operations on thread attribute objects.
   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_attr_init (pthread_attr_t * attr)
  43      /*
  44       * ------------------------------------------------------
  45       * DOCPUBLIC
  46       *      Initializes a thread attributes object with default
  47       *      attributes.
  48       *
  49       * PARAMETERS
  50       *      attr
  51       *              pointer to an instance of pthread_attr_t
  52       *
  53       *
  54       * DESCRIPTION
  55       *      Initializes a thread attributes object with default
  56       *      attributes.
  57       *
  58       *      NOTES:
  59       *              1)      Used to define thread attributes
  60       *
  61       * RESULTS
  62       *              0               successfully initialized attr,
  63       *              ENOMEM          insufficient memory for attr.
  64       *
  65       * ------------------------------------------------------
  66       */
  67 {
  68   pthread_attr_t attr_result;
  69
  70   if (attr == NULL)
  71     {
  72       /* This is disallowed. */
  73       return EINVAL;
  74     }
  75
  76   attr_result = (pthread_attr_t) malloc (sizeof (*attr_result));
  77
  78   if (attr_result == NULL)
  79     {
  80       return ENOMEM;
  81     }
  82
  83 #if defined(_POSIX_THREAD_ATTR_STACKSIZE)
  84   /*
  85    * Default to zero size. Unless changed explicitly this
  86    * will allow Win32 to set the size to that of the
  87    * main thread.
  88    */
  89   attr_result->stacksize = 0;
  90 #endif
  91
  92 #if defined(_POSIX_THREAD_ATTR_STACKADDR)
  93   /* FIXME: Set this to something sensible when we support it. */
  94   attr_result->stackaddr = NULL;
  95 #endif
  96
  97   attr_result->detachstate = PTHREAD_CREATE_JOINABLE;
  98
  99 #if defined(HAVE_SIGSET_T)
 100   memset (&(attr_result->sigmask), 0, sizeof (sigset_t));
 101 #endif /* HAVE_SIGSET_T */
 102
 103   /*
 104    * Win32 sets new threads to THREAD_PRIORITY_NORMAL and
 105    * not to that of the parent thread. We choose to default to
 106    * this arrangement.
 107    */
 108   attr_result->param.sched_priority = THREAD_PRIORITY_NORMAL;
 109   attr_result->inheritsched = PTHREAD_EXPLICIT_SCHED;
 110   attr_result->contentionscope = PTHREAD_SCOPE_SYSTEM;
 111
 112   attr_result->valid = PTW32_ATTR_VALID;
 113
 114   *attr = attr_result;
 115
 116   return 0;
 117 }