1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
/* $OpenBSD: rthread_attr.c,v 1.25 2018/05/02 14:06:00 bluhm Exp $ */
/*
* Copyright (c) 2004,2005 Ted Unangst <tedu@openbsd.org>
* All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* generic attribute support
*/
#include <sys/mman.h>
#include <stdint.h>
#include <stdlib.h>
#include <syslog.h>
#include <unistd.h>
#include <errno.h>
#include <pthread.h>
#include <pthread_np.h>
#include "rthread.h"
/*
* Note: stack_size + guard_size == total stack used
*
* pthread_attr_init MUST be called before any other attribute function
* for proper operation.
*
* Every call to pthread_attr_init MUST be matched with a call to
* pthread_attr_destroy to avoid leaking memory. This is an implementation
* requirement, not a POSIX requirement.
*/
int
pthread_attr_init(pthread_attr_t *attrp)
{
pthread_attr_t attr;
/* make sure _rthread_attr_default has been initialized */
if (!_threads_ready)
_rthread_init();
attr = calloc(1, sizeof(*attr));
if (!attr)
return (errno);
*attr = _rthread_attr_default;
*attrp = attr;
return (0);
}
int
pthread_attr_destroy(pthread_attr_t *attrp)
{
free(*attrp);
*attrp = NULL;
return (0);
}
int
pthread_attr_getguardsize(const pthread_attr_t *attrp, size_t *guardsize)
{
*guardsize = (*attrp)->guard_size;
return (0);
}
int
pthread_attr_setguardsize(pthread_attr_t *attrp, size_t guardsize)
{
(*attrp)->guard_size = guardsize;
return (0);
}
int
pthread_attr_getdetachstate(const pthread_attr_t *attrp, int *detachstate)
{
*detachstate = (*attrp)->detach_state;
return (0);
}
int
pthread_attr_setdetachstate(pthread_attr_t *attrp, int detachstate)
{
int error;
error = (detachstate == PTHREAD_CREATE_DETACHED ||
detachstate == PTHREAD_CREATE_JOINABLE) ? 0 : EINVAL;
if (error == 0)
(*attrp)->detach_state = detachstate;
return (error);
}
int
pthread_attr_getstack(const pthread_attr_t *attrp, void **stackaddr,
size_t *stacksize)
{
*stackaddr = (*attrp)->stack_addr;
*stacksize = (*attrp)->stack_size;
return (0);
}
int
pthread_attr_setstack(pthread_attr_t *attrp, void *stackaddr, size_t stacksize)
{
int error;
volatile char *p = stackaddr;
size_t i;
struct syslog_data data = SYSLOG_DATA_INIT;
if (stacksize < PTHREAD_STACK_MIN) {
syslog_r(LOG_ERR, &data,
"pthread_attr_setstack(%p, %zu): "
"stack size below min size %d",
stackaddr, stacksize, PTHREAD_STACK_MIN);
return (EINVAL);
}
/*
* Make sure that the stack is page-aligned and a multiple
* of the page size
*/
if (((uintptr_t)stackaddr % PTHREAD_STACK_MIN) != 0
|| (stacksize % PTHREAD_STACK_MIN) != 0) {
syslog_r(LOG_ERR, &data,
"pthread_attr_setstack(%p, 0x%zx): "
"unaligned thread stack start and/or size",
stackaddr, stacksize);
return (EINVAL);
}
/*
* We are going to re-mmap() stackaddr to MAP_STACK, but only
* if the entire range [stackaddr, stackaddr+stacksize) consists
* of valid address that are mapped PROT_READ|PROT_WRITE.
* Test this by reading and writing every page.
*
* XXX: What if the caller has SIGSEGV blocked or ignored?
* Then we won't crash here when entering an invalid mapping.
*/
for (i = 0; i < stacksize; i += PTHREAD_STACK_MIN) {
char val = p[i];
p[i] = val;
}
if (mmap(stackaddr, stacksize, PROT_READ|PROT_WRITE,
MAP_FIXED|MAP_STACK|MAP_ANON|MAP_PRIVATE, -1, 0) == MAP_FAILED) {
syslog_r(LOG_ERR, &data,
"pthread_attr_setstack(%p, %zu): mmap error %m",
stackaddr, stacksize);
return (errno);
}
if ((error = pthread_attr_setstackaddr(attrp, stackaddr)))
return (error);
(*attrp)->stack_size = stacksize;
return (0);
}
int
pthread_attr_getstacksize(const pthread_attr_t *attrp, size_t *stacksize)
{
*stacksize = (*attrp)->stack_size;
return (0);
}
int
pthread_attr_setstacksize(pthread_attr_t *attrp, size_t stacksize)
{
if (!_threads_ready) /* for ROUND_TO_PAGE */
_rthread_init();
if (stacksize < PTHREAD_STACK_MIN ||
stacksize > ROUND_TO_PAGE(stacksize))
return (EINVAL);
(*attrp)->stack_size = stacksize;
return (0);
}
int
pthread_attr_getstackaddr(const pthread_attr_t *attrp, void **stackaddr)
{
*stackaddr = (*attrp)->stack_addr;
return (0);
}
int
pthread_attr_setstackaddr(pthread_attr_t *attrp, void *stackaddr)
{
if (!_threads_ready)
_rthread_init(); /* for _thread_pagesize */
if (stackaddr == NULL || (uintptr_t)stackaddr & (_thread_pagesize - 1))
return (EINVAL);
(*attrp)->stack_addr = stackaddr;
return (0);
}
DEF_NONSTD(pthread_attr_setstackaddr);
int
pthread_attr_getscope(const pthread_attr_t *attrp, int *contentionscope)
{
*contentionscope = (*attrp)->contention_scope;
return (0);
}
int
pthread_attr_setscope(pthread_attr_t *attrp, int contentionscope)
{
if (contentionscope != PTHREAD_SCOPE_SYSTEM &&
contentionscope != PTHREAD_SCOPE_PROCESS)
return (EINVAL);
(*attrp)->contention_scope = contentionscope;
return (0);
}
|
