1 /* Copyright (C) 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library 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 GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
23 #include <stdio_ext.h>
26 #include <sys/resource.h>
28 #include <lowlevellock.h>
37 struct pthread
*thread
= (struct pthread
*) thread_id
;
38 struct pthread_attr
*iattr
= (struct pthread_attr
*) attr
;
41 lll_lock (thread
->lock
, LLL_PRIVATE
);
43 /* The thread library is responsible for keeping the values in the
44 thread desriptor up-to-date in case the user changes them. */
45 memcpy (&iattr
->schedparam
, &thread
->schedparam
,
46 sizeof (struct sched_param
));
47 iattr
->schedpolicy
= thread
->schedpolicy
;
49 /* Clear the flags work. */
50 iattr
->flags
= thread
->flags
;
52 /* The thread might be detached by now. */
53 if (IS_DETACHED (thread
))
54 iattr
->flags
|= ATTR_FLAG_DETACHSTATE
;
56 /* This is the guardsize after adjusting it. */
57 iattr
->guardsize
= thread
->reported_guardsize
;
59 /* The sizes are subject to alignment. */
60 if (__builtin_expect (thread
->stackblock
!= NULL
, 1))
62 iattr
->stacksize
= thread
->stackblock_size
;
63 iattr
->stackaddr
= (char *) thread
->stackblock
+ iattr
->stacksize
;
67 /* No stack information available. This must be for the initial
68 thread. Get the info in some magical way. */
69 assert (abs (thread
->pid
) == thread
->tid
);
71 /* Stack size limit. */
74 /* The safest way to get the top of the stack is to read
75 /proc/self/maps and locate the line into which
76 __libc_stack_end falls. */
77 FILE *fp
= fopen ("/proc/self/maps", "rc");
80 /* We need the limit of the stack in any case. */
83 if (getrlimit (RLIMIT_STACK
, &rl
) != 0)
87 /* We need no locking. */
88 __fsetlocking (fp
, FSETLOCKING_BYCALLER
);
90 /* Until we found an entry (which should always be the case)
91 mark the result as a failure. */
96 uintptr_t last_to
= 0;
98 while (! feof_unlocked (fp
))
100 if (getdelim (&line
, &linelen
, '\n', fp
) <= 0)
105 if (sscanf (line
, "%" SCNxPTR
"-%" SCNxPTR
, &from
, &to
) != 2)
107 if (from
<= (uintptr_t) __libc_stack_end
108 && (uintptr_t) __libc_stack_end
< to
)
110 /* Found the entry. Now we have the info we need. */
111 iattr
->stacksize
= rl
.rlim_cur
;
112 iattr
->stackaddr
= (void *) to
;
114 /* The limit might be too high. */
115 if ((size_t) iattr
->stacksize
116 > (size_t) iattr
->stackaddr
- last_to
)
117 iattr
->stacksize
= (size_t) iattr
->stackaddr
- last_to
;
119 /* We succeed and no need to look further. */
133 iattr
->flags
|= ATTR_FLAG_STACKADDR
;
138 cpu_set_t
*cpuset
= NULL
;
144 void *newp
= realloc (cpuset
, size
);
150 cpuset
= (cpu_set_t
*) newp
;
152 ret
= __pthread_getaffinity_np (thread_id
, size
, cpuset
);
154 /* Pick some ridiculous upper limit. Is 8 million CPUs enough? */
155 while (ret
== EINVAL
&& size
< 1024 * 1024);
159 iattr
->cpuset
= cpuset
;
160 iattr
->cpusetsize
= size
;
167 /* There is no such functionality. */
169 iattr
->cpuset
= NULL
;
170 iattr
->cpusetsize
= 0;
175 lll_unlock (thread
->lock
, LLL_PRIVATE
);