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1 .\" Copyright (C) 2000 Jason Evans <jasone@FreeBSD.org>.
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28 .\" $FreeBSD: src/share/man/man3/pthread_attr.3,v 1.18 2007/10/22 10:08:00 ru Exp $
29 .\" $DragonFly: src/lib/libc_r/man/pthread_attr.3,v 1.2 2003/06/17 04:26:47 dillon Exp $
30 .Dd July 10, 2009
31 .Dt PTHREAD_ATTR 3
32 .Os
33 .Sh NAME
34 .Nm pthread_attr_init ,
35 .Nm pthread_attr_destroy ,
36 .Nm pthread_attr_setstack ,
37 .Nm pthread_attr_getstack ,
38 .Nm pthread_attr_setstacksize ,
39 .Nm pthread_attr_getstacksize ,
40 .Nm pthread_attr_setguardsize ,
41 .Nm pthread_attr_getguardsize ,
42 .Nm pthread_attr_setstackaddr ,
43 .Nm pthread_attr_getstackaddr ,
44 .Nm pthread_attr_setdetachstate ,
45 .Nm pthread_attr_getdetachstate ,
46 .Nm pthread_attr_setinheritsched ,
47 .Nm pthread_attr_getinheritsched ,
48 .Nm pthread_attr_setschedparam ,
49 .Nm pthread_attr_getschedparam ,
50 .Nm pthread_attr_setschedpolicy ,
51 .Nm pthread_attr_getschedpolicy ,
52 .Nm pthread_attr_setscope ,
53 .Nm pthread_attr_getscope
54 .Nd thread attribute operations
55 .Sh LIBRARY
56 .Lb libpthread
57 .Sh SYNOPSIS
58 .In pthread.h
59 .Ft int
60 .Fn pthread_attr_init "pthread_attr_t *attr"
61 .Ft int
62 .Fn pthread_attr_destroy "pthread_attr_t *attr"
63 .Ft int
64 .Fn pthread_attr_setstack "pthread_attr_t *attr" "void *stackaddr" "size_t stacksize"
65 .Ft int
66 .Fn pthread_attr_getstack "const pthread_attr_t * restrict attr" "void ** restrict stackaddr" "size_t * restrict stacksize"
67 .Ft int
68 .Fn pthread_attr_setstacksize "pthread_attr_t *attr" "size_t stacksize"
69 .Ft int
70 .Fn pthread_attr_getstacksize "const pthread_attr_t *attr" "size_t *stacksize"
71 .Ft int
72 .Fn pthread_attr_setguardsize "pthread_attr_t *attr" "size_t guardsize"
73 .Ft int
74 .Fn pthread_attr_getguardsize "const pthread_attr_t *attr" "size_t *guardsize"
75 .Ft int
76 .Fn pthread_attr_setstackaddr "pthread_attr_t *attr" "void *stackaddr"
77 .Ft int
78 .Fn pthread_attr_getstackaddr "const pthread_attr_t *attr" "void **stackaddr"
79 .Ft int
80 .Fn pthread_attr_setdetachstate "pthread_attr_t *attr" "int detachstate"
81 .Ft int
82 .Fn pthread_attr_getdetachstate "const pthread_attr_t *attr" "int *detachstate"
83 .Ft int
84 .Fn pthread_attr_setinheritsched "pthread_attr_t *attr" "int inheritsched"
85 .Ft int
86 .Fn pthread_attr_getinheritsched "const pthread_attr_t *attr" "int *inheritsched"
87 .Ft int
88 .Fn pthread_attr_setschedparam "pthread_attr_t *attr" "const struct sched_param *param"
89 .Ft int
90 .Fn pthread_attr_getschedparam "const pthread_attr_t *attr" "struct sched_param *param"
91 .Ft int
92 .Fn pthread_attr_setschedpolicy "pthread_attr_t *attr" "int policy"
93 .Ft int
94 .Fn pthread_attr_getschedpolicy "const pthread_attr_t *attr" "int *policy"
95 .Ft int
96 .Fn pthread_attr_setscope "pthread_attr_t *attr" "int contentionscope"
97 .Ft int
98 .Fn pthread_attr_getscope "const pthread_attr_t *attr" "int *contentionscope"
99 .Sh DESCRIPTION
100 Thread attributes are used to specify parameters to
101 .Fn pthread_create .
102 One attribute object can be used in multiple calls to
103 .Fn pthread_create ,
104 with or without modifications between calls.
105 .Pp
106 The
107 .Fn pthread_attr_init
108 function initializes
109 .Fa attr
110 with all the default thread attributes.
111 .Pp
112 The
113 .Fn pthread_attr_destroy
114 function destroys
115 .Fa attr .
116 .Pp
117 The
118 .Fn pthread_attr_set*
119 functions set the attribute that corresponds to each function name.
120 .Pp
121 The
122 .Fn pthread_attr_get*
123 functions copy the value of the attribute that corresponds to each function name
124 to the location pointed to by the second function parameter.
125 .Sh RETURN VALUES
126 If successful, these functions return 0.
127 Otherwise, an error number is returned to indicate the error.
128 .Sh ERRORS
129 The
130 .Fn pthread_attr_init
131 function will fail if:
132 .Bl -tag -width Er
133 .It Bq Er ENOMEM
134 Out of memory.
135 .El
136 .Pp
137 The
138 .Fn pthread_attr_destroy
139 function will fail if:
140 .Bl -tag -width Er
141 .It Bq Er EINVAL
142 Invalid value for
143 .Fa attr .
144 .El
145 .Pp
146 The
147 .Fn pthread_attr_setstacksize
148 and
149 .Fn pthread_attr_setstack
150 functions will fail if:
151 .Bl -tag -width Er
152 .It Bq Er EINVAL
153 .Fa stacksize
154 is less than
155 .Dv PTHREAD_STACK_MIN .
156 .El
157 .Pp
158 The
159 .Fn pthread_attr_setguardsize
160 and
161 .Fn pthread_attr_getguardsize
162 functions will fail if:
163 .Bl -tag -width Er
164 .It Bq Er EINVAL
165 Invalid value for
166 .Fa guardsize .
167 .El
168 .Pp
169 The
170 .Fn pthread_attr_setdetachstate
171 function will fail if:
172 .Bl -tag -width Er
173 .It Bq Er EINVAL
174 Invalid value for
175 .Fa detachstate .
176 .El
177 .Pp
178 The
179 .Fn pthread_attr_setinheritsched
180 function will fail if:
181 .Bl -tag -width Er
182 .It Bq Er EINVAL
183 Invalid value for
184 .Fa attr .
185 .El
186 .Pp
187 The
188 .Fn pthread_attr_setschedparam
189 function will fail if:
190 .Bl -tag -width Er
191 .It Bq Er EINVAL
192 Invalid value for
193 .Fa attr .
194 .It Bq Er ENOTSUP
195 Invalid value for
196 .Fa param .
197 .El
198 .Pp
199 The
200 .Fn pthread_attr_setschedpolicy
201 function will fail if:
202 .Bl -tag -width Er
203 .It Bq Er EINVAL
204 Invalid value for
205 .Fa attr .
206 .It Bq Er ENOTSUP
207 Invalid or unsupported value for
208 .Fa policy .
209 .El
210 .Pp
211 The
212 .Fn pthread_attr_setscope
213 function will fail if:
214 .Bl -tag -width Er
215 .It Bq Er EINVAL
216 Invalid value for
217 .Fa attr .
218 .It Bq Er ENOTSUP
219 Invalid or unsupported value for
220 .Fa contentionscope .
221 .El
222 .Sh SEE ALSO
223 .Xr pthread_attr_get_np 3 ,
224 .Xr pthread_create 3
225 .Sh STANDARDS
226 The
227 .Fn pthread_attr_init ,
228 .Fn pthread_attr_destroy ,
229 .Fn pthread_attr_setstacksize ,
230 .Fn pthread_attr_getstacksize ,
231 .Fn pthread_attr_setstackaddr ,
232 .Fn pthread_attr_getstackaddr ,
233 .Fn pthread_attr_setdetachstate ,
234 and
235 .Fn pthread_attr_getdetachstate
236 functions conform to
237 .St -p1003.1-96 .
238 .Pp
239 The
240 .Fn pthread_attr_setinheritsched ,
241 .Fn pthread_attr_getinheritsched ,
242 .Fn pthread_attr_setschedparam ,
243 .Fn pthread_attr_getschedparam ,
244 .Fn pthread_attr_setschedpolicy ,
245 .Fn pthread_attr_getschedpolicy ,
246 .Fn pthread_attr_setscope ,
247 and
248 .Fn pthread_attr_getscope
249 functions conform to
250 .St -susv2 .