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 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
35 */
36
37 #include "pthread.h"
38 #include "implement.h"
39
40
41 int
pthread_attr_init(pthread_attr_t * attr)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