+++ /dev/null
-/* Linuxthreads - a simple clone()-based implementation of Posix */
-/* threads for Linux. */
-/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */
-/* */
-/* This program is free software; you can redistribute it and/or */
-/* modify it under the terms of the GNU Library General Public License */
-/* as published by the Free Software Foundation; either version 2 */
-/* of the License, or (at your option) any later version. */
-/* */
-/* This program 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 Library General Public License for more details. */
-
-/* Handling of thread attributes */
-
-#include <errno.h>
-#include <inttypes.h>
-#include <stdio.h>
-#include <stdio_ext.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <sys/param.h>
-#include <sys/resource.h>
-#include "pthread.h"
-#include "internals.h"
-
-
-int __pthread_attr_init(pthread_attr_t *attr)
-{
- size_t ps = __getpagesize ();
-
- attr->__detachstate = PTHREAD_CREATE_JOINABLE;
- attr->__schedpolicy = SCHED_OTHER;
- attr->__schedparam.sched_priority = 0;
- attr->__inheritsched = PTHREAD_EXPLICIT_SCHED;
- attr->__scope = PTHREAD_SCOPE_SYSTEM;
-#ifdef NEED_SEPARATE_REGISTER_STACK
- attr->__guardsize = ps + ps;
-#else
- attr->__guardsize = ps;
-#endif
- attr->__stackaddr = NULL;
- attr->__stackaddr_set = 0;
- attr->__stacksize = STACK_SIZE - ps;
- return 0;
-}
-strong_alias (__pthread_attr_init, pthread_attr_init)
-
-int __pthread_attr_destroy(pthread_attr_t *attr)
-{
- return 0;
-}
-strong_alias (__pthread_attr_destroy, pthread_attr_destroy)
-
-int __pthread_attr_setdetachstate(pthread_attr_t *attr, int detachstate)
-{
- if (detachstate < PTHREAD_CREATE_JOINABLE ||
- detachstate > PTHREAD_CREATE_DETACHED)
- return EINVAL;
- attr->__detachstate = detachstate;
- return 0;
-}
-strong_alias (__pthread_attr_setdetachstate, pthread_attr_setdetachstate)
-
-int __pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate)
-{
- *detachstate = attr->__detachstate;
- return 0;
-}
-strong_alias (__pthread_attr_getdetachstate, pthread_attr_getdetachstate)
-
-int __pthread_attr_setschedparam(pthread_attr_t *attr,
- const struct sched_param *param)
-{
- int max_prio = __sched_get_priority_max(attr->__schedpolicy);
- int min_prio = __sched_get_priority_min(attr->__schedpolicy);
-
- if (param->sched_priority < min_prio || param->sched_priority > max_prio)
- return EINVAL;
- memcpy (&attr->__schedparam, param, sizeof (struct sched_param));
- return 0;
-}
-strong_alias (__pthread_attr_setschedparam, pthread_attr_setschedparam)
-
-int __pthread_attr_getschedparam(const pthread_attr_t *attr,
- struct sched_param *param)
-{
- memcpy (param, &attr->__schedparam, sizeof (struct sched_param));
- return 0;
-}
-strong_alias (__pthread_attr_getschedparam, pthread_attr_getschedparam)
-
-int __pthread_attr_setschedpolicy(pthread_attr_t *attr, int policy)
-{
- if (policy != SCHED_OTHER && policy != SCHED_FIFO && policy != SCHED_RR)
- return EINVAL;
- attr->__schedpolicy = policy;
- return 0;
-}
-strong_alias (__pthread_attr_setschedpolicy, pthread_attr_setschedpolicy)
-
-int __pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy)
-{
- *policy = attr->__schedpolicy;
- return 0;
-}
-strong_alias (__pthread_attr_getschedpolicy, pthread_attr_getschedpolicy)
-
-int __pthread_attr_setinheritsched(pthread_attr_t *attr, int inherit)
-{
- if (inherit != PTHREAD_INHERIT_SCHED && inherit != PTHREAD_EXPLICIT_SCHED)
- return EINVAL;
- attr->__inheritsched = inherit;
- return 0;
-}
-strong_alias (__pthread_attr_setinheritsched, pthread_attr_setinheritsched)
-
-int __pthread_attr_getinheritsched(const pthread_attr_t *attr, int *inherit)
-{
- *inherit = attr->__inheritsched;
- return 0;
-}
-strong_alias (__pthread_attr_getinheritsched, pthread_attr_getinheritsched)
-
-int __pthread_attr_setscope(pthread_attr_t *attr, int scope)
-{
- switch (scope) {
- case PTHREAD_SCOPE_SYSTEM:
- attr->__scope = scope;
- return 0;
- case PTHREAD_SCOPE_PROCESS:
- return ENOTSUP;
- default:
- return EINVAL;
- }
-}
-strong_alias (__pthread_attr_setscope, pthread_attr_setscope)
-
-int __pthread_attr_getscope(const pthread_attr_t *attr, int *scope)
-{
- *scope = attr->__scope;
- return 0;
-}
-strong_alias (__pthread_attr_getscope, pthread_attr_getscope)
-
-int __pthread_attr_setguardsize(pthread_attr_t *attr, size_t guardsize)
-{
- /* The guard size must not be larger than the stack itself */
- if (guardsize >= attr->__stacksize) return EINVAL;
-
- attr->__guardsize = guardsize;
-
- return 0;
-}
-weak_alias (__pthread_attr_setguardsize, pthread_attr_setguardsize)
-
-int __pthread_attr_getguardsize(const pthread_attr_t *attr, size_t *guardsize)
-{
- *guardsize = attr->__guardsize;
- return 0;
-}
-weak_alias (__pthread_attr_getguardsize, pthread_attr_getguardsize)
-
-#if 0 /* uClibc: deprecated stuff disabled */
-int __pthread_attr_setstackaddr(pthread_attr_t *attr, void *stackaddr)
-{
- attr->__stackaddr = stackaddr;
- attr->__stackaddr_set = 1;
- return 0;
-}
-weak_alias (__pthread_attr_setstackaddr, pthread_attr_setstackaddr)
-
-link_warning (pthread_attr_setstackaddr,
- "the use of `pthread_attr_setstackaddr' is deprecated, use `pthread_attr_setstack'")
-
-int __pthread_attr_getstackaddr(const pthread_attr_t *attr, void **stackaddr)
-{
- /* XXX This function has a stupid definition. The standard specifies
- no error value but what is if no stack address was set? We simply
- return the value we have in the member. */
- *stackaddr = attr->__stackaddr;
- return 0;
-}
-weak_alias (__pthread_attr_getstackaddr, pthread_attr_getstackaddr)
-
-link_warning (pthread_attr_getstackaddr,
- "the use of `pthread_attr_getstackaddr' is deprecated, use `pthread_attr_getstack'")
-#endif
-
-
-int __pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
-{
-#ifdef FLOATING_STACKS
- /* We have to check against the maximum allowed stack size. This is no
- problem if the manager is already started and we determined it. If
- this hasn't happened, we have to find the limit outself. */
- if (__pthread_max_stacksize == 0)
- __pthread_init_max_stacksize ();
-
- if (stacksize > __pthread_max_stacksize)
- return EINVAL;
-#else
- /* We have a fixed size limit. */
- if (stacksize > STACK_SIZE)
- return EINVAL;
-#endif
-
- /* We don't accept value smaller than PTHREAD_STACK_MIN. */
- if (stacksize < PTHREAD_STACK_MIN)
- return EINVAL;
-
- attr->__stacksize = stacksize;
- return 0;
-}
-
-#if PTHREAD_STACK_MIN == 16384 || defined __UCLIBC__
-weak_alias (__pthread_attr_setstacksize, pthread_attr_setstacksize)
-#else
-versioned_symbol (libpthread, __pthread_attr_setstacksize,
- pthread_attr_setstacksize, GLIBC_2_3_3);
-
-# if SHLIB_COMPAT(libpthread, GLIBC_2_1, GLIBC_2_3_3)
-
-int __old_pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
-{
-# ifdef FLOATING_STACKS
- /* We have to check against the maximum allowed stack size. This is no
- problem if the manager is already started and we determined it. If
- this hasn't happened, we have to find the limit outself. */
- if (__pthread_max_stacksize == 0)
- __pthread_init_max_stacksize ();
-
- if (stacksize > __pthread_max_stacksize)
- return EINVAL;
-# else
- /* We have a fixed size limit. */
- if (stacksize > STACK_SIZE)
- return EINVAL;
-# endif
-
- /* We don't accept value smaller than old PTHREAD_STACK_MIN. */
- if (stacksize < 16384)
- return EINVAL;
-
- attr->__stacksize = stacksize;
- return 0;
-}
-compat_symbol (libpthread, __old_pthread_attr_setstacksize,
- pthread_attr_setstacksize, GLIBC_2_1);
-# endif
-#endif
-
-
-int __pthread_attr_getstacksize(const pthread_attr_t *attr, size_t *stacksize)
-{
- *stacksize = attr->__stacksize;
- return 0;
-}
-weak_alias (__pthread_attr_getstacksize, pthread_attr_getstacksize)
-
-int __pthread_attr_setstack (pthread_attr_t *attr, void *stackaddr,
- size_t stacksize)
-{
- int err;
-
- if ((((uintptr_t) stackaddr)
- & (__alignof__ (struct _pthread_descr_struct) - 1)) != 0)
- err = EINVAL;
- else
- err = __pthread_attr_setstacksize (attr, stacksize);
- if (err == 0)
- {
-#ifndef _STACK_GROWS_UP
- attr->__stackaddr = (char *) stackaddr + stacksize;
-#else
- attr->__stackaddr = stackaddr;
-#endif
- attr->__stackaddr_set = 1;
- }
-
- return err;
-}
-
-#if PTHREAD_STACK_MIN == 16384 || defined __UCLIBC__
-weak_alias (__pthread_attr_setstack, pthread_attr_setstack)
-#else
-versioned_symbol (libpthread, __pthread_attr_setstack, pthread_attr_setstack,
- GLIBC_2_3_3);
-# if SHLIB_COMPAT(libpthread, GLIBC_2_2, GLIBC_2_3_3)
-int __old_pthread_attr_setstack (pthread_attr_t *attr, void *stackaddr,
- size_t stacksize)
-{
- int err;
-
- if ((((uintptr_t) stackaddr)
- & (__alignof__ (struct _pthread_descr_struct) - 1)) != 0)
- err = EINVAL;
- else
- err = __old_pthread_attr_setstacksize (attr, stacksize);
- if (err == 0)
- {
-# ifndef _STACK_GROWS_UP
- attr->__stackaddr = (char *) stackaddr + stacksize;
-# else
- attr->__stackaddr = stackaddr;
-# endif
- attr->__stackaddr_set = 1;
- }
-
- return err;
-}
-
-compat_symbol (libpthread, __old_pthread_attr_setstack, pthread_attr_setstack,
- GLIBC_2_2);
-
-# endif
-#endif
-
-int __pthread_attr_getstack (const pthread_attr_t *attr, void **stackaddr,
- size_t *stacksize)
-{
- /* XXX This function has a stupid definition. The standard specifies
- no error value but what is if no stack address was set? We simply
- return the value we have in the member. */
-#ifndef _STACK_GROWS_UP
- *stackaddr = (char *) attr->__stackaddr - attr->__stacksize;
-#else
- *stackaddr = attr->__stackaddr;
-#endif
- *stacksize = attr->__stacksize;
- return 0;
-}
-weak_alias (__pthread_attr_getstack, pthread_attr_getstack)
-
-int pthread_getattr_np (pthread_t thread, pthread_attr_t *attr)
-{
- pthread_handle handle = thread_handle (thread);
- pthread_descr descr;
- int ret = 0;
-
- if (handle == NULL)
- return ENOENT;
-
- descr = handle->h_descr;
-
- attr->__detachstate = (descr->p_detached
- ? PTHREAD_CREATE_DETACHED
- : PTHREAD_CREATE_JOINABLE);
-
- attr->__schedpolicy = __sched_getscheduler (descr->p_pid);
- if (attr->__schedpolicy == -1)
- return errno;
-
- if (__sched_getparam (descr->p_pid,
- (struct sched_param *) &attr->__schedparam) != 0)
- return errno;
-
- attr->__inheritsched = descr->p_inheritsched;
- attr->__scope = PTHREAD_SCOPE_SYSTEM;
-
-#ifdef _STACK_GROWS_DOWN
-# ifdef __UCLIBC_HAS_TLS__
- attr->__stacksize = descr->p_stackaddr - (char *)descr->p_guardaddr
- - descr->p_guardsize;
-# else
- attr->__stacksize = (char *)(descr + 1) - (char *)descr->p_guardaddr
- - descr->p_guardsize;
-# endif
-#else
-# ifdef __UCLIBC_HAS_TLS__
- attr->__stacksize = (char *)descr->p_guardaddr - descr->p_stackaddr;
-# else
- attr->__stacksize = (char *)descr->p_guardaddr - (char *)descr;
-# endif
-#endif
- attr->__guardsize = descr->p_guardsize;
- attr->__stackaddr_set = descr->p_userstack;
-#ifdef NEED_SEPARATE_REGISTER_STACK
- if (descr->p_userstack == 0)
- attr->__stacksize *= 2;
- /* XXX This is awkward. The guard pages are in the middle of the
- two stacks. We must count the guard size in the stack size since
- otherwise the range of the stack area cannot be computed. */
- attr->__stacksize += attr->__guardsize;
-#endif
-#ifdef __UCLIBC_HAS_TLS__
- attr->__stackaddr = descr->p_stackaddr;
-#else
-# ifndef _STACK_GROWS_UP
- attr->__stackaddr = (char *)(descr + 1);
-# else
- attr->__stackaddr = (char *)descr;
-# endif
-#endif
-
-#ifdef __UCLIBC_HAS_TLS__
- if (attr->__stackaddr == NULL)
-#else
- if (descr == &__pthread_initial_thread)
-#endif
- {
- /* 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", "rc");
- 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 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;
- uintptr_t last_to = 0;
-
- 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. */
- attr->__stacksize = rl.rlim_cur;
-#ifdef _STACK_GROWS_UP
- /* Don't check to enforce a limit on the __stacksize */
- attr->__stackaddr = (void *) from;
-#else
- attr->__stackaddr = (void *) to;
-
- /* The limit might be too high. */
- if ((size_t) attr->__stacksize
- > (size_t) attr->__stackaddr - last_to)
- attr->__stacksize = (size_t) attr->__stackaddr - last_to;
-#endif
-
- /* We succeed and no need to look further. */
- ret = 0;
- break;
- }
- last_to = to;
- }
-
- fclose (fp);
- free (line);
- }
- }
-
- return 0;
-
-}
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