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
41int
42pthread_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