diff options
Diffstat (limited to 'newlib/libc/sys/linux/linuxthreads/attr.c')
| -rw-r--r-- | newlib/libc/sys/linux/linuxthreads/attr.c | 308 |
1 files changed, 308 insertions, 0 deletions
diff --git a/newlib/libc/sys/linux/linuxthreads/attr.c b/newlib/libc/sys/linux/linuxthreads/attr.c new file mode 100644 index 000000000..4b3a8f434 --- /dev/null +++ b/newlib/libc/sys/linux/linuxthreads/attr.c @@ -0,0 +1,308 @@ +/* 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 <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; +} + +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; +} + +int pthread_attr_getdetachstate(const pthread_attr_t *attr, int *detachstate) +{ + *detachstate = attr->__detachstate; + return 0; +} + +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; +} + +int pthread_attr_getschedparam(const pthread_attr_t *attr, + struct sched_param *param) +{ + memcpy (param, &attr->__schedparam, sizeof (struct sched_param)); + return 0; +} + +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; +} + +int pthread_attr_getschedpolicy(const pthread_attr_t *attr, int *policy) +{ + *policy = attr->__schedpolicy; + return 0; +} + +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; +} + +int pthread_attr_getinheritsched(const pthread_attr_t *attr, int *inherit) +{ + *inherit = attr->__inheritsched; + return 0; +} + +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; + } +} + +int pthread_attr_getscope(const pthread_attr_t *attr, int *scope) +{ + *scope = attr->__scope; + return 0; +} + +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; +} +weak_alias (__pthread_attr_setstacksize, pthread_attr_setstacksize) + +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; +} +weak_alias (__pthread_attr_setstack, pthread_attr_setstack) + +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; + + 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 + attr->__stacksize = (char *)(descr + 1) - (char *)descr->p_guardaddr + - descr->p_guardsize; +#else + attr->__stacksize = (char *)descr->p_guardaddr - (char *)descr; +#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 +#ifndef _STACK_GROWS_UP + attr->__stackaddr = (char *)(descr + 1); +#else + attr->__stackaddr = (char *)descr; +#endif + + return 0; +} |