1 | /* Linuxthreads - a simple clone()-based implementation of Posix */ |
---|
2 | /* threads for Linux. */ |
---|
3 | /* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */ |
---|
4 | /* */ |
---|
5 | /* This program is free software; you can redistribute it and/or */ |
---|
6 | /* modify it under the terms of the GNU Library General Public License */ |
---|
7 | /* as published by the Free Software Foundation; either version 2 */ |
---|
8 | /* of the License, or (at your option) any later version. */ |
---|
9 | /* */ |
---|
10 | /* This program is distributed in the hope that it will be useful, */ |
---|
11 | /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ |
---|
12 | /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ |
---|
13 | /* GNU Library General Public License for more details. */ |
---|
14 | |
---|
15 | /* Handling of thread attributes */ |
---|
16 | |
---|
17 | #include <errno.h> |
---|
18 | #include <string.h> |
---|
19 | #include <unistd.h> |
---|
20 | #include <sys/param.h> |
---|
21 | #include <sys/resource.h> |
---|
22 | #include "pthread.h" |
---|
23 | #include "internals.h" |
---|
24 | #include <shlib-compat.h> |
---|
25 | |
---|
26 | int __pthread_attr_init_2_1(pthread_attr_t *attr) |
---|
27 | { |
---|
28 | size_t ps = __getpagesize (); |
---|
29 | |
---|
30 | attr->__detachstate = PTHREAD_CREATE_JOINABLE; |
---|
31 | attr->__schedpolicy = SCHED_OTHER; |
---|
32 | attr->__schedparam.__sched_priority = 0; |
---|
33 | attr->__inheritsched = PTHREAD_EXPLICIT_SCHED; |
---|
34 | attr->__scope = PTHREAD_SCOPE_SYSTEM; |
---|
35 | attr->__guardsize = ps; |
---|
36 | attr->__stackaddr = NULL; |
---|
37 | attr->__stackaddr_set = 0; |
---|
38 | attr->__stacksize = STACK_SIZE - ps; |
---|
39 | return 0; |
---|
40 | } |
---|
41 | |
---|
42 | versioned_symbol (libpthread, __pthread_attr_init_2_1, pthread_attr_init, |
---|
43 | GLIBC_2_1); |
---|
44 | |
---|
45 | #if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1) |
---|
46 | int __pthread_attr_init_2_0(pthread_attr_t *attr) |
---|
47 | { |
---|
48 | attr->__detachstate = PTHREAD_CREATE_JOINABLE; |
---|
49 | attr->__schedpolicy = SCHED_OTHER; |
---|
50 | attr->__schedparam.__sched_priority = 0; |
---|
51 | attr->__inheritsched = PTHREAD_EXPLICIT_SCHED; |
---|
52 | attr->__scope = PTHREAD_SCOPE_SYSTEM; |
---|
53 | return 0; |
---|
54 | } |
---|
55 | compat_symbol (libpthread, __pthread_attr_init_2_0, pthread_attr_init, |
---|
56 | GLIBC_2_0); |
---|
57 | #endif |
---|
58 | |
---|
59 | int pthread_attr_destroy(pthread_attr_t *attr) |
---|
60 | { |
---|
61 | return 0; |
---|
62 | } |
---|
63 | |
---|
64 | int pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate) |
---|
65 | { |
---|
66 | if (detachstate < PTHREAD_CREATE_JOINABLE || |
---|
67 | detachstate > PTHREAD_CREATE_DETACHED) |
---|
68 | return EINVAL; |
---|
69 | attr->__detachstate = detachstate; |
---|
70 | return 0; |
---|
71 | } |
---|
72 | |
---|
73 | int pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate) |
---|
74 | { |
---|
75 | *detachstate = attr->__detachstate; |
---|
76 | return 0; |
---|
77 | } |
---|
78 | |
---|
79 | int pthread_attr_setschedparam(pthread_attr_t *attr, |
---|
80 | const struct sched_param *param) |
---|
81 | { |
---|
82 | int max_prio = __sched_get_priority_max(attr->__schedpolicy); |
---|
83 | int min_prio = __sched_get_priority_min(attr->__schedpolicy); |
---|
84 | |
---|
85 | if (param->sched_priority < min_prio || param->sched_priority > max_prio) |
---|
86 | return EINVAL; |
---|
87 | memcpy (&attr->__schedparam, param, sizeof (struct sched_param)); |
---|
88 | return 0; |
---|
89 | } |
---|
90 | |
---|
91 | int pthread_attr_getschedparam(const pthread_attr_t *attr, |
---|
92 | struct sched_param *param) |
---|
93 | { |
---|
94 | memcpy (param, &attr->__schedparam, sizeof (struct sched_param)); |
---|
95 | return 0; |
---|
96 | } |
---|
97 | |
---|
98 | int pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy) |
---|
99 | { |
---|
100 | if (policy != SCHED_OTHER && policy != SCHED_FIFO && policy != SCHED_RR) |
---|
101 | return EINVAL; |
---|
102 | attr->__schedpolicy = policy; |
---|
103 | return 0; |
---|
104 | } |
---|
105 | |
---|
106 | int pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy) |
---|
107 | { |
---|
108 | *policy = attr->__schedpolicy; |
---|
109 | return 0; |
---|
110 | } |
---|
111 | |
---|
112 | int pthread_attr_setinheritsched(pthread_attr_t *attr, int inherit) |
---|
113 | { |
---|
114 | if (inherit != PTHREAD_INHERIT_SCHED && inherit != PTHREAD_EXPLICIT_SCHED) |
---|
115 | return EINVAL; |
---|
116 | attr->__inheritsched = inherit; |
---|
117 | return 0; |
---|
118 | } |
---|
119 | |
---|
120 | int pthread_attr_getinheritsched(const pthread_attr_t *attr, int *inherit) |
---|
121 | { |
---|
122 | *inherit = attr->__inheritsched; |
---|
123 | return 0; |
---|
124 | } |
---|
125 | |
---|
126 | int pthread_attr_setscope(pthread_attr_t *attr, int scope) |
---|
127 | { |
---|
128 | switch (scope) { |
---|
129 | case PTHREAD_SCOPE_SYSTEM: |
---|
130 | attr->__scope = scope; |
---|
131 | return 0; |
---|
132 | case PTHREAD_SCOPE_PROCESS: |
---|
133 | return ENOTSUP; |
---|
134 | default: |
---|
135 | return EINVAL; |
---|
136 | } |
---|
137 | } |
---|
138 | |
---|
139 | int pthread_attr_getscope(const pthread_attr_t *attr, int *scope) |
---|
140 | { |
---|
141 | *scope = attr->__scope; |
---|
142 | return 0; |
---|
143 | } |
---|
144 | |
---|
145 | int __pthread_attr_setguardsize(pthread_attr_t *attr, size_t guardsize) |
---|
146 | { |
---|
147 | /* The guard size must not be larger than the stack itself */ |
---|
148 | if (guardsize >= attr->__stacksize) return EINVAL; |
---|
149 | |
---|
150 | attr->__guardsize = guardsize; |
---|
151 | |
---|
152 | return 0; |
---|
153 | } |
---|
154 | weak_alias (__pthread_attr_setguardsize, pthread_attr_setguardsize) |
---|
155 | |
---|
156 | int __pthread_attr_getguardsize(const pthread_attr_t *attr, size_t *guardsize) |
---|
157 | { |
---|
158 | *guardsize = attr->__guardsize; |
---|
159 | return 0; |
---|
160 | } |
---|
161 | weak_alias (__pthread_attr_getguardsize, pthread_attr_getguardsize) |
---|
162 | |
---|
163 | int __pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr) |
---|
164 | { |
---|
165 | attr->__stackaddr = stackaddr; |
---|
166 | attr->__stackaddr_set = 1; |
---|
167 | return 0; |
---|
168 | } |
---|
169 | weak_alias (__pthread_attr_setstackaddr, pthread_attr_setstackaddr) |
---|
170 | |
---|
171 | link_warning (pthread_attr_setstackaddr, |
---|
172 | "the use of `pthread_attr_setstackaddr' is deprecated, use `pthread_attr_setstack'") |
---|
173 | |
---|
174 | int __pthread_attr_getstackaddr(const pthread_attr_t *attr, void **stackaddr) |
---|
175 | { |
---|
176 | /* XXX This function has a stupid definition. The standard specifies |
---|
177 | no error value but what is if no stack address was set? We simply |
---|
178 | return the value we have in the member. */ |
---|
179 | *stackaddr = attr->__stackaddr; |
---|
180 | return 0; |
---|
181 | } |
---|
182 | weak_alias (__pthread_attr_getstackaddr, pthread_attr_getstackaddr) |
---|
183 | |
---|
184 | link_warning (pthread_attr_getstackaddr, |
---|
185 | "the use of `pthread_attr_getstackaddr' is deprecated, use `pthread_attr_getstack'") |
---|
186 | |
---|
187 | |
---|
188 | int __pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize) |
---|
189 | { |
---|
190 | #ifdef FLOATING_STACKS |
---|
191 | /* We have to check against the maximum allowed stack size. This is no |
---|
192 | problem if the manager is already started and we determined it. If |
---|
193 | this hasn't happened, we have to find the limit outself. */ |
---|
194 | if (__pthread_max_stacksize == 0) |
---|
195 | __pthread_init_max_stacksize (); |
---|
196 | |
---|
197 | if (stacksize > __pthread_max_stacksize) |
---|
198 | return EINVAL; |
---|
199 | #else |
---|
200 | /* We have a fixed size limit. */ |
---|
201 | if (stacksize > STACK_SIZE) |
---|
202 | return EINVAL; |
---|
203 | #endif |
---|
204 | |
---|
205 | /* We don't accept value smaller than PTHREAD_STACK_MIN. */ |
---|
206 | if (stacksize < PTHREAD_STACK_MIN) |
---|
207 | return EINVAL; |
---|
208 | |
---|
209 | attr->__stacksize = stacksize; |
---|
210 | return 0; |
---|
211 | } |
---|
212 | weak_alias (__pthread_attr_setstacksize, pthread_attr_setstacksize) |
---|
213 | |
---|
214 | int __pthread_attr_getstacksize(const pthread_attr_t *attr, size_t *stacksize) |
---|
215 | { |
---|
216 | *stacksize = attr->__stacksize; |
---|
217 | return 0; |
---|
218 | } |
---|
219 | weak_alias (__pthread_attr_getstacksize, pthread_attr_getstacksize) |
---|
220 | |
---|
221 | int __pthread_attr_setstack (pthread_attr_t *attr, void *stackaddr, |
---|
222 | size_t stacksize) |
---|
223 | { |
---|
224 | int err; |
---|
225 | |
---|
226 | if ((((uintptr_t) stackaddr) |
---|
227 | & (__alignof__ (struct _pthread_descr_struct) - 1)) != 0) |
---|
228 | err = EINVAL; |
---|
229 | else |
---|
230 | err = __pthread_attr_setstacksize (attr, stacksize); |
---|
231 | if (err == 0) |
---|
232 | { |
---|
233 | #ifndef _STACK_GROWS_UP |
---|
234 | attr->__stackaddr = (char *) stackaddr + stacksize; |
---|
235 | #else |
---|
236 | attr->__stackaddr = stackaddr; |
---|
237 | #endif |
---|
238 | attr->__stackaddr_set = 1; |
---|
239 | } |
---|
240 | |
---|
241 | return err; |
---|
242 | } |
---|
243 | weak_alias (__pthread_attr_setstack, pthread_attr_setstack) |
---|
244 | |
---|
245 | int __pthread_attr_getstack (const pthread_attr_t *attr, void **stackaddr, |
---|
246 | size_t *stacksize) |
---|
247 | { |
---|
248 | /* XXX This function has a stupid definition. The standard specifies |
---|
249 | no error value but what is if no stack address was set? We simply |
---|
250 | return the value we have in the member. */ |
---|
251 | #ifndef _STACK_GROWS_UP |
---|
252 | *stackaddr = (char *) attr->__stackaddr - attr->__stacksize; |
---|
253 | #else |
---|
254 | *stackaddr = attr->__stackaddr; |
---|
255 | #endif |
---|
256 | *stacksize = attr->__stacksize; |
---|
257 | return 0; |
---|
258 | } |
---|
259 | weak_alias (__pthread_attr_getstack, pthread_attr_getstack) |
---|
260 | |
---|
261 | int pthread_getattr_np (pthread_t thread, pthread_attr_t *attr) |
---|
262 | { |
---|
263 | pthread_handle handle = thread_handle (thread); |
---|
264 | pthread_descr descr; |
---|
265 | |
---|
266 | if (handle == NULL) |
---|
267 | return ENOENT; |
---|
268 | |
---|
269 | descr = handle->h_descr; |
---|
270 | |
---|
271 | attr->__detachstate = (descr->p_detached |
---|
272 | ? PTHREAD_CREATE_DETACHED |
---|
273 | : PTHREAD_CREATE_JOINABLE); |
---|
274 | |
---|
275 | attr->__schedpolicy = __sched_getscheduler (descr->p_pid); |
---|
276 | if (attr->__schedpolicy == -1) |
---|
277 | return errno; |
---|
278 | |
---|
279 | if (__sched_getparam (descr->p_pid, |
---|
280 | (struct sched_param *) &attr->__schedparam) != 0) |
---|
281 | return errno; |
---|
282 | |
---|
283 | attr->__inheritsched = descr->p_inheritsched; |
---|
284 | attr->__scope = PTHREAD_SCOPE_SYSTEM; |
---|
285 | #ifdef _STACK_GROWS_DOWN |
---|
286 | attr->__stacksize = (char *)(descr + 1) - (char *)descr->p_guardaddr |
---|
287 | - descr->p_guardsize; |
---|
288 | #else |
---|
289 | attr->__stacksize = (char *)descr->p_guardaddr - (char *)descr; |
---|
290 | #endif |
---|
291 | attr->__guardsize = descr->p_guardsize; |
---|
292 | attr->__stackaddr_set = descr->p_userstack; |
---|
293 | #ifdef NEED_SEPARATE_REGISTER_STACK |
---|
294 | if (descr->p_userstack == 0) |
---|
295 | attr->__stacksize *= 2; |
---|
296 | /* XXX This is awkward. The guard pages are in the middle of the |
---|
297 | two stacks. We must count the guard size in the stack size since |
---|
298 | otherwise the range of the stack area cannot be computed. */ |
---|
299 | attr->__stacksize += attr->__guardsize; |
---|
300 | #endif |
---|
301 | #ifndef _STACK_GROWS_UP |
---|
302 | attr->__stackaddr = (char *)(descr + 1); |
---|
303 | #else |
---|
304 | attr->__stackaddr = (char *)descr; |
---|
305 | #endif |
---|
306 | |
---|
307 | return 0; |
---|
308 | } |
---|