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);