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glibc/linuxthreads/attr.c
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/* 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 <string.h> | |
#include <unistd.h> | |
#include <sys/param.h> | |
#include <sys/resource.h> | |
#include "pthread.h" | |
#include "internals.h" | |
#include <shlib-compat.h> | |
int __pthread_attr_init_2_1(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; | |
attr->__guardsize = ps; | |
attr->__stackaddr = NULL; | |
attr->__stackaddr_set = 0; | |
attr->__stacksize = STACK_SIZE - ps; | |
return 0; | |
} | |
versioned_symbol (libpthread, __pthread_attr_init_2_1, pthread_attr_init, | |
GLIBC_2_1); | |
#if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1) | |
int __pthread_attr_init_2_0(pthread_attr_t *attr) | |
{ | |
attr->__detachstate = PTHREAD_CREATE_JOINABLE; | |
attr->__schedpolicy = SCHED_OTHER; | |
attr->__schedparam.sched_priority = 0; | |
attr->__inheritsched = PTHREAD_EXPLICIT_SCHED; | |
attr->__scope = PTHREAD_SCOPE_SYSTEM; | |
return 0; | |
} | |
compat_symbol (libpthread, __pthread_attr_init_2_0, pthread_attr_init, | |
GLIBC_2_0); | |
#endif | |
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) | |
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'") | |
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 | |
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 | |
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 USE_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 USE_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 USE_TLS | |
attr->__stackaddr = descr->p_stackaddr; | |
#else | |
# ifndef _STACK_GROWS_UP | |
attr->__stackaddr = (char *)(descr + 1); | |
# else | |
attr->__stackaddr = (char *)descr; | |
# endif | |
#endif | |
#ifdef USE_TLS | |
if (attr->__stackaddr == NULL) | |
#else | |
if (descr == &__pthread_initial_thread) | |
#endif | |
{ | |
/* Defined in ld.so. */ | |
extern void *__libc_stack_end; | |
/* 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; | |
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 | |
&& 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; | |
attr->__stackaddr = (void *) to; | |
/* The limit might be too high. This is a bogus | |
situation but try to avoid making it worse. */ | |
if ((size_t) attr->__stacksize > (size_t) attr->__stackaddr) | |
attr->__stacksize = (size_t) attr->__stackaddr; | |
/* We succeed and no need to look further. */ | |
ret = 0; | |
break; | |
} | |
} | |
fclose (fp); | |
free (line); | |
} | |
} | |
return 0; | |
} |