Home | History | Annotate | Download | only in pthreads-win32 
      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 (at) 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 }
    118