diff options
Diffstat (limited to 'REORG.TODO/nptl/pthread_getattr_np.c')
| -rw-r--r-- | REORG.TODO/nptl/pthread_getattr_np.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/REORG.TODO/nptl/pthread_getattr_np.c b/REORG.TODO/nptl/pthread_getattr_np.c new file mode 100644 index 0000000000..06093b3d92 --- /dev/null +++ b/REORG.TODO/nptl/pthread_getattr_np.c @@ -0,0 +1,207 @@ +/* Copyright (C) 2002-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <assert.h> +#include <errno.h> +#include <inttypes.h> +#include <stdio.h> +#include <stdio_ext.h> +#include <stdlib.h> +#include <string.h> +#include <sys/resource.h> +#include "pthreadP.h" +#include <lowlevellock.h> +#include <ldsodefs.h> + + +int +pthread_getattr_np (pthread_t thread_id, pthread_attr_t *attr) +{ + struct pthread *thread = (struct pthread *) thread_id; + struct pthread_attr *iattr = (struct pthread_attr *) attr; + int ret = 0; + + lll_lock (thread->lock, LLL_PRIVATE); + + /* The thread library is responsible for keeping the values in the + thread desriptor up-to-date in case the user changes them. */ + memcpy (&iattr->schedparam, &thread->schedparam, + sizeof (struct sched_param)); + iattr->schedpolicy = thread->schedpolicy; + + /* Clear the flags work. */ + iattr->flags = thread->flags; + + /* The thread might be detached by now. */ + if (IS_DETACHED (thread)) + iattr->flags |= ATTR_FLAG_DETACHSTATE; + + /* This is the guardsize after adjusting it. */ + iattr->guardsize = thread->reported_guardsize; + + /* The sizes are subject to alignment. */ + if (__glibc_likely (thread->stackblock != NULL)) + { + iattr->stacksize = thread->stackblock_size; +#if _STACK_GROWS_DOWN + iattr->stackaddr = (char *) thread->stackblock + iattr->stacksize; +#else + iattr->stackaddr = (char *) thread->stackblock; +#endif + } + else + { + /* No stack information available. This must be for the initial + thread. Get the info in some magical way. */ + + /* Stack size limit. */ + struct rlimit rl; + + /* The safest way to get the top of the stack is to read + /proc/self/maps and locate the line into which + __libc_stack_end falls. */ + FILE *fp = fopen ("/proc/self/maps", "rce"); + if (fp == NULL) + ret = errno; + /* We need the limit of the stack in any case. */ + else + { + if (getrlimit (RLIMIT_STACK, &rl) != 0) + ret = errno; + else + { + /* We consider the main process stack to have ended with + the page containing __libc_stack_end. There is stuff below + it in the stack too, like the program arguments, environment + variables and auxv info, but we ignore those pages when + returning size so that the output is consistent when the + stack is marked executable due to a loaded DSO requiring + it. */ + void *stack_end = (void *) ((uintptr_t) __libc_stack_end + & -(uintptr_t) GLRO(dl_pagesize)); +#if _STACK_GROWS_DOWN + stack_end += GLRO(dl_pagesize); +#endif + /* We need no locking. */ + __fsetlocking (fp, FSETLOCKING_BYCALLER); + + /* Until we found an entry (which should always be the case) + mark the result as a failure. */ + ret = ENOENT; + + char *line = NULL; + size_t linelen = 0; +#if _STACK_GROWS_DOWN + uintptr_t last_to = 0; +#endif + + while (! feof_unlocked (fp)) + { + if (__getdelim (&line, &linelen, '\n', fp) <= 0) + break; + + uintptr_t from; + uintptr_t to; + if (sscanf (line, "%" SCNxPTR "-%" SCNxPTR, &from, &to) != 2) + continue; + if (from <= (uintptr_t) __libc_stack_end + && (uintptr_t) __libc_stack_end < to) + { + /* Found the entry. Now we have the info we need. */ + iattr->stackaddr = stack_end; + iattr->stacksize = + rl.rlim_cur - (size_t) (to - (uintptr_t) stack_end); + + /* Cut it down to align it to page size since otherwise we + risk going beyond rlimit when the kernel rounds up the + stack extension request. */ + iattr->stacksize = (iattr->stacksize + & -(intptr_t) GLRO(dl_pagesize)); +#if _STACK_GROWS_DOWN + /* The limit might be too high. */ + if ((size_t) iattr->stacksize + > (size_t) iattr->stackaddr - last_to) + iattr->stacksize = (size_t) iattr->stackaddr - last_to; +#else + /* The limit might be too high. */ + if ((size_t) iattr->stacksize + > to - (size_t) iattr->stackaddr) + iattr->stacksize = to - (size_t) iattr->stackaddr; +#endif + /* We succeed and no need to look further. */ + ret = 0; + break; + } +#if _STACK_GROWS_DOWN + last_to = to; +#endif + } + + free (line); + } + + fclose (fp); + } + } + + iattr->flags |= ATTR_FLAG_STACKADDR; + + if (ret == 0) + { + size_t size = 16; + cpu_set_t *cpuset = NULL; + + do + { + size <<= 1; + + void *newp = realloc (cpuset, size); + if (newp == NULL) + { + ret = ENOMEM; + break; + } + cpuset = (cpu_set_t *) newp; + + ret = __pthread_getaffinity_np (thread_id, size, cpuset); + } + /* Pick some ridiculous upper limit. Is 8 million CPUs enough? */ + while (ret == EINVAL && size < 1024 * 1024); + + if (ret == 0) + { + iattr->cpuset = cpuset; + iattr->cpusetsize = size; + } + else + { + free (cpuset); + if (ret == ENOSYS) + { + /* There is no such functionality. */ + ret = 0; + iattr->cpuset = NULL; + iattr->cpusetsize = 0; + } + } + } + + lll_unlock (thread->lock, LLL_PRIVATE); + + return ret; +} |